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Pfau T, Bruce OL, Sawatsky A, Leguillette R, Edwards WB. Dirt Track Surface Preparation and Associated Differences in Speed, Stride Length, and Stride Frequency in Galloping Horses. Sensors (Basel) 2024; 24:2441. [PMID: 38676058 PMCID: PMC11054522 DOI: 10.3390/s24082441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Revised: 04/05/2024] [Accepted: 04/09/2024] [Indexed: 04/28/2024]
Abstract
In racehorses, the risk of musculoskeletal injury is linked to a decrease in speed and stride length (SL) over consecutive races prior to injury. Surface characteristics influence stride parameters. We hypothesized that large changes in stride parameters are found during galloping in response to dirt racetrack preparation. Harrowing of the back stretch of a half-mile dirt racetrack was altered in three individual lanes with decreasing depth from the inside to the outside. Track underlay compaction and water content were changed between days. Twelve horses (six on day 2) were sequentially galloped at a target speed of 16 ms-1 across the three lanes. Speed, stride frequency (SF), and SL were quantified with a GPS/GNSS logger. Mixed linear models with speed as covariate analyzed SF and SL, with track hardness and moisture content as fixed factors (p < 0.05). At the average speed of 16.48 ms-1, hardness (both p < 0.001) and moisture content (both p < 0.001) had significant effects on SF and SL. The largest difference in SL of 0.186 m between hardness and moisture conditions exceeded the 0.10 m longitudinal decrease over consecutive race starts previously identified as injury predictor. This suggests that detailed measurements of track conditions might be useful for refining injury prediction models.
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Affiliation(s)
- Thilo Pfau
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada; (A.S.); (W.B.E.)
- Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 1N4, Canada;
| | - Olivia L. Bruce
- Department of Biomedical Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada;
- McCaig Institute for Bone and Joint Health, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Andrew Sawatsky
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada; (A.S.); (W.B.E.)
| | - Renaud Leguillette
- Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 1N4, Canada;
| | - W. Brent Edwards
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada; (A.S.); (W.B.E.)
- Department of Biomedical Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada;
- McCaig Institute for Bone and Joint Health, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 1N4, Canada
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Pan X, Liang B, Li X. Flexible and fine-grained simulation of speed in language processing. Front Psychol 2024; 15:1333598. [PMID: 38659688 PMCID: PMC11040083 DOI: 10.3389/fpsyg.2024.1333598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Accepted: 03/21/2024] [Indexed: 04/26/2024] Open
Abstract
According to the embodied cognition theory, language comprehension is achieved through mental simulation. This account is supported by a number of studies reporting action simulations during language comprehension. However, which details of sensory-motor experience are included in these simulations is still controversial. Here, three experiments were carried out to examine the simulation of speed in action language comprehension. Experiment 1 adopted a lexical decision task and a semantic similarity judgment task on isolated fast and slow action verbs. It has been shown that fast action verbs were processed significantly faster than slow action verbs when deep semantic processing is required. Experiment 2 and Experiment 3 investigated the contextual influence on the simulation of speed, showing that the processing of verbs, either depicting fast actions or neutral actions, would be slowed down when embedded in the slow action sentences. These experiments together demonstrate that the fine-gained information, speed, is an important part of action representation and can be simulated but may not in an automatic way. Moreover, the speed simulation is flexible and can be modulated by the context.
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Affiliation(s)
- Xueyao Pan
- School of Foreign Languages and Literatures, Chongqing Normal University, Chongqing, China
| | - Bingqian Liang
- School of Foreign Studies, Anhui Xinhua University, Hefei, China
| | - Xi Li
- Foreign Language College, Chengdu Normal University, Chengdu, China
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3
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Rabbani M, Bogulski CA, Allison MK, Eswaran H, Hayes C. Telehealth and Willingness to Pay for Internet Services. Telemed J E Health 2024. [PMID: 38588557 DOI: 10.1089/tmj.2023.0692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2024] Open
Abstract
Introduction: Telehealth is becoming integral to health care delivery, which may create a higher need for better internet. This is the first study to examine whether users are willing to spend more on their internet if they are (1) more experienced in using telehealth, (2) more optimistic about telehealth benefits, and (3) less concerned about the difficulty of using telehealth. Methods: We surveyed 5,200 Americans about their willingness to pay (WTP) for internet speed and quality on the one hand, and their (1) prior use of telehealth, (2) opinion about the benefits of telehealth, and (3) opinion about the difficulties of using telehealth. We stratified the sample using the three aspects above and conducted a conjoint analysis to estimate the WTP for internet speed and quality within each stratum. Results: Compared with respondents who had never used telehealth, respondents who had used five to six different types of telehealth services were willing to spend 50.4% more on their internet plans. Users who most firmly believed in the benefits of telehealth were willing to spend 59.2% more than the most pessimistic users. Users who had the lowest concerns about the difficulty of using telehealth were willing to spend 114% more than users with the most perceived difficulty. Discussion: We found strong ties between the WTP for internet and prior telehealth use and perceptions of telehealth benefits and barriers. Thus, internet expenditures may be influenced by users' anticipation of using telehealth. Future studies may investigate the causality of the relationship.
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Affiliation(s)
- Maysam Rabbani
- Department of Economics, Feliciano School of Business, Montclair State University, Montclair, New Jersey, USA
| | - Cari A Bogulski
- Department of Biomedical Informatics, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
- Institute for Digital Health and Innovation, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - M Kathryn Allison
- Department of Health Behavior and Health Education, College of Public Health, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Hari Eswaran
- Institute for Digital Health and Innovation, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
- Department of Obstetrics and Gynecology, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Corey Hayes
- Department of Biomedical Informatics, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
- Institute for Digital Health and Innovation, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
- Central Arkansas Veterans Healthcare System, Eugene J. Towbin Healthcare Center, North Little Rock, Arkansas, USA
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Turcotte PL, Holmes D. Vanishing academics: On the importance of speed and becoming-imperceptible. Nurs Inq 2024; 31:e12619. [PMID: 38062860 DOI: 10.1111/nin.12619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Revised: 11/15/2023] [Accepted: 11/22/2023] [Indexed: 04/22/2024]
Abstract
Under the influence of neoliberalism, academic work faces mounting pressure to align with imperatives of visibility and perceptibility. Traditionally criticised for working in isolated 'ivory towers', academics are now compelled to showcase the societal value of their work through performance metrics and evaluations. Paradoxically, these efforts have unintentionally led to the rigidification and commodification of academic work, stifling the production of knowledge beyond predefined parameters. In this paper, we contend that academics should resist the imposition of this neoliberal 'grid' and instead seek a path of 'becoming-imperceptible', drawing inspiration from the insights of Deleuze and Guattari. Becoming-imperceptible does not entail silent disengagement; rather, it represents a creative form of resistance challenging prevailing modes of assessment rooted in visibility and perceptibility. By incorporating the concept of 'fast feminism' to subvert Paul Virilio's hypermasculine speed theory, we uncover the transformative potential of temporary absences. Leveraging these moments of absence, academics can intensify their affective connections with both their peers and their work, making them undiscernible to the confines of the academic establishment. We argue that these instances of imperceptibility create fertile ground for creative and inventive academic endeavours on the margins of established boundaries, where original scholarship can flourish. Such a subversive approach is particularly relevant in fields like nursing and the health sciences, where it can challenge the dominant discourses that typify neoliberal academia.
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Affiliation(s)
- Pier-Luc Turcotte
- School of Rehabilitation Sciences, Faculty of Health Sciences, University of Ottawa, Ontario, Canada
| | - Dave Holmes
- School of Nursing, Faculty of Health Sciences, University of Ottawa, Ontario, Canada
- Faculty of Science, Technology and Medicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
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Lee JH, Kim EJ. Optimizing Rehabilitation Outcomes for Stroke Survivors: The Impact of Speed and Slope Adjustments in Anti-Gravity Treadmill Training. Medicina (Kaunas) 2024; 60:542. [PMID: 38674188 PMCID: PMC11052273 DOI: 10.3390/medicina60040542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Revised: 03/14/2024] [Accepted: 03/26/2024] [Indexed: 04/28/2024]
Abstract
Background and Objectives: This study explored the efficacy of customized anti-gravity treadmill (AGT) training, with adjustments in speed and incline, on rehabilitation outcomes for stroke patients, focusing on knee extensor muscle strength, joint angle, balance ability, and activities of daily living (ADLs). Materials and Methods: In this study, 30 individuals diagnosed with a stroke were divided into three groups. Experimental group 1 (EG1) underwent training without changes to speed and incline, experimental group 2 (EG2) received training with an increased incline, and experimental group 3 (EG3) underwent training with increased speed. Initially, all participants received AGT training under uniform conditions for two weeks. Subsequently, from the third to the sixth week, each group underwent their specified training intervention. Evaluations were conducted before the intervention and six weeks post-intervention using a manual muscle strength tester for knee strength, TETRAX for balance ability, Dartfish software for analyzing knee angle, and the Korean version of the Modified Barthel Index (K-MBI) for assessing activities of daily living. Results: Within-group comparisons revealed that AGT training led to enhancements in muscle strength, balance ability, joint angle, and ADLs across all participant groups. Between-group analyses indicated that EG2, which underwent increased incline training, demonstrated significant improvements in muscle strength and balance ability over EG1. EG3 not only showed significant enhancements in muscle strength, joint angle, and ADLs when compared to EG1 but also surpassed EG2 in terms of knee strength improvement. Conclusions: In conclusion, the application of customized AGT training positively impacts the rehabilitation of stroke patients, underscoring the importance of selecting a treatment method tailored to the specific needs of each patient.
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Affiliation(s)
| | - Eun-Ja Kim
- Department of Physical Therapy, Kyungdong University, 815 Gyeonhwon-ro, Munmak-eup, Wonju-si 26495, Republic of Korea;
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Kadlubowski B, Keiner M, Wirth K, Csapo R. Association between Sprint and Jump Performance and Maximum Strength in Standing Calf Raise or Squat in Elite Youth Soccer Players. Sports (Basel) 2024; 12:87. [PMID: 38668555 PMCID: PMC11054242 DOI: 10.3390/sports12040087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Revised: 03/07/2024] [Accepted: 03/12/2024] [Indexed: 04/29/2024] Open
Abstract
Soccer is a complex sports discipline that requires players to engage in diverse high-intensity and multidirectional activities. The optimization of strength and conditioning programs requires a comprehensive understanding of the physical attributes influencing player performance. While previous research has demonstrated the influence of knee and hip extensor muscles on the performance in sprints and other explosive movements, this study aimed to establish the relationship between plantar flexor muscle strength and high-intensity actions. Back squat (BS) and calf raise (CR) one-repetition maxima as well as linear sprint (5-, 10-, 30 m) and drop jump performance from different heights (15, 30, 45 and 60 cm) were measured in 45 elite youth players (age: 16.62 ± 1.1 years). Results showed significant negative correlations between BS strength and sprint times (r = -0.60 to -0.61), confirming the importance of lower limb extensor muscle strength in short-distance sprints. While no significant correlations were found with sprint performances, CR strength was significantly associated with drop jump test results from 45 and 60 cm drop height (r = 0.36 to 0.46). These findings demonstrate that isolated CR strength positively influences the performance in actions involving rapid stretch-shortening cycles, which suggests that current strength and conditioning programs for youth soccer players should be extended to also include exercises specifically targeting the plantar flexor muscles. While this cross-sectional study provides novel insights into the complex interplay between muscle strength and soccer-specific performance, its findings need to be corroborated in longitudinal studies directly testing the impact of plantar flexor strength training.
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Affiliation(s)
- Björn Kadlubowski
- Department of Sport and Human Movement Science, Centre for Sport Science and University Sports, University of Vienna, 1150 Vienna, Austria;
- Vienna Doctoral School of Pharmaceutical, Nutritional and Sport Sciences, University of Vienna, 1090 Vienna, Austria
| | - Michael Keiner
- Department of Training and Exercise Science, German University of Health and Sport, 10587 Berlin, Germany;
| | - Klaus Wirth
- Department of Training and Sport, University of Applied Sciences Wiener Neustadt, 2700 Wiener Neustadt, Austria;
| | - Robert Csapo
- Department of Sport and Human Movement Science, Centre for Sport Science and University Sports, University of Vienna, 1150 Vienna, Austria;
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Igonin PH, Cognasse F, Gonzalo P, Philippot P, Rogowski I, Sabot T, Boisseau N, Martin C. Monitoring of sprint and change of direction velocity, vertical jump height, and repeated sprint ability in sub-elite female football players throughout their menstrual cycle. SCI MED FOOTBALL 2024:1-9. [PMID: 38492212 DOI: 10.1080/24733938.2024.2328674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 03/01/2024] [Indexed: 03/18/2024]
Abstract
AIMS The aim of this study was to investigate the associations between the early follicular (EF, i.e., menstruation), late follicular (LF), and middle luteal (ML) phases of the menstrual cycle and different factors that may influence football performance. METHODS To this end, 11 eumenorrheic sub-elite female football players underwent field tests to assess sprint speed, lower extremity power, repeated sprint ability, velocity on change of direction, and technical skills at each cycle phase. RESULTS Performance during the 15-m change of direction ability test, 15-m ball dribbling test, squat jump height, total sprint time [sum of 7 sprints] and decrement score [(mean sprint time/best sprint time × 100) - 100], maximum and mean heart rate, and perceived exertion did not significantly differ among menstrual cycle phases. Conversely, the linear sprint velocity over 10, 20, 30-m distances was decreased in EF vs LF (10-, 20- and 30-m) and in ML vs LF (10- and 20-m) (p < 0.05). The 40-m sprint velocity did not change in the different menstrual cycle phases. CONCLUSION Overall, our study suggests that sex hormone fluctuations during the menstrual cycle are not associated with vertical jump, velocity on change of direction, and repeated sprint ability, but may influence linear sprint velocity over short distances (10, 20, and 30 m).
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Affiliation(s)
- P H Igonin
- Laboratoire Inter-universitaire de Biologie de la Motricité (LIBM EA 7424), Université Claude Bernard Lyon I, Lyon, France
- Association Sportive de Saint-Etienne (ASSE), Saint-Etienne, France
| | - F Cognasse
- Institut National de la Santé et de la Recherche Médicale (INSERM U1059), Université Jean Monnet, Saint-Etienne, France
| | - P Gonzalo
- Laboratoire de Biochimie Pharmaco-Toxicologie, Centre Hospitalier Universitaire de Saint-Etienne (CHU), Saint-Etienne, France
| | - P Philippot
- Laboratoire Inter-universitaire de Biologie de la Motricité (LIBM EA 7424), Université Claude Bernard Lyon I, Lyon, France
- Association Sportive de Saint-Etienne (ASSE), Saint-Etienne, France
- Service de Chirurgie Orthopédique, Centre Hospitalier Universitaire de Saint-Etienne (CHU), Saint-Etienne, France
| | - I Rogowski
- Laboratoire Inter-universitaire de Biologie de la Motricité (LIBM EA 7424), Université Claude Bernard Lyon I, Lyon, France
| | - T Sabot
- Association Sportive de Saint-Etienne (ASSE), Saint-Etienne, France
| | - N Boisseau
- Laboratoire des Adaptations Métaboliques à l'Exercice en conditions Physiologiques et Pathologiques (AME2P), Université Clermont Auvergne, Clermont-Ferrand, France
| | - C Martin
- Laboratoire Inter-universitaire de Biologie de la Motricité (LIBM EA 7424), Université Claude Bernard Lyon I, Lyon, France
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Sakai S, Sarodo A, Watanabe K. Increase in speed eliminates duration expansion of a novel motion stimulus. Perception 2024:3010066241237429. [PMID: 38465583 DOI: 10.1177/03010066241237429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
A novel motion stimulus is perceived to last longer than the subsequent motion stimulus moving in the opposite direction. A previous study suggested that the discrepancy in the processing latency for different onset types, as measured by reaction time, may play a role in this duration expansion. The present study examined whether the speed of motion stimuli influences this duration expansion. Experiment 1 demonstrated that the duration expansion ceased to occur when the stimulus speed increased. Experiment 2 showed that the increase in the speed reduced the reaction time for various onset types. However, the size of the changes in the reaction time did not match the reduction in the magnitude of the duration expansion observed in Experiment 1. These results suggest that the increase in speed eliminates the duration expansion of the novel motion stimulus, but the difference in the processing latency alone may not be the sole mechanism.
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Ju U, Wallraven C. Decoding the dynamic perception of risk and speed using naturalistic stimuli: A multivariate, whole-brain analysis. Hum Brain Mapp 2024; 45:e26652. [PMID: 38488473 PMCID: PMC10941534 DOI: 10.1002/hbm.26652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Revised: 02/20/2024] [Accepted: 02/25/2024] [Indexed: 03/18/2024] Open
Abstract
Time-resolved decoding of speed and risk perception in car driving is important for understanding the perceptual processes related to driving safety. In this study, we used an fMRI-compatible trackball with naturalistic stimuli to record dynamic ratings of perceived risk and speed and investigated the degree to which different brain regions were able to decode these. We presented participants with first-person perspective videos of cars racing on the same course. These videos varied in terms of subjectively perceived speed and risk profiles, as determined during a behavioral pilot. During the fMRI experiment, participants used the trackball to dynamically rate subjective risk in a first and speed in a second session and assessed overall risk and speed after watching each video. A standard multivariate correlation analysis based on these ratings revealed sparse decodability in visual areas only for the risk ratings. In contrast, the dynamic rating-based correlation analysis uncovered frontal, visual, and temporal region activation for subjective risk and dorsal visual stream and temporal region activation for subjectively perceived speed. Interestingly, further analyses showed that the brain regions for decoding risk changed over time, whereas those for decoding speed remained constant. Overall, our results demonstrate the advantages of time-resolved decoding to help our understanding of the dynamic networks associated with decoding risk and speed perception in realistic driving scenarios.
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Affiliation(s)
- Uijong Ju
- Department of Information DisplayKyung Hee UniversitySeoulSouth Korea
| | - Christian Wallraven
- Department of Brain and Cognitive EngineeringKorea UniversitySouth Korea
- Department of Artificial IntelligenceKorea UniversitySouth Korea
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Kobayashi T, Jor A, He Y, Hu M, Koh MWP, Hisano G, Hara T, Hobara H. Transfemoral prosthetic simulators versus amputees: ground reaction forces and spatio-temporal parameters in gait. R Soc Open Sci 2024; 11:231854. [PMID: 38545618 PMCID: PMC10966393 DOI: 10.1098/rsos.231854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2023] [Revised: 02/14/2024] [Accepted: 02/19/2024] [Indexed: 04/26/2024]
Abstract
This study aimed to compare the ground reaction forces (GRFs) and spatio-temporal parameters as well as their asymmetry ratios in gait between individuals wearing a transfemoral prosthetic simulator (TFSim) and individuals with unilateral transfemoral amputation (TFAmp) across a range of walking speeds (2.0-5.5 km h-1). The study recruited 10 non-disabled individuals using TFSim and 10 individuals with unilateral TFAmp using a transfemoral prosthesis. Data were collected using an instrumented treadmill with built-in force plates, and subsequently, the GRFs and spatio-temporal parameters, as well as their asymmetry ratios, were analysed. When comparing the TFSim and TFAmp groups, no significant differences were found among the gait parameters and asymmetry ratios of all tested metrics except the vertical GRFs. The TFSim may not realistically reproduce the vertical GRFs during the weight acceptance and push-off phases. The structural and functional variations in prosthetic limbs and components between the TFSim and TFAmp groups may be primary contributors to the difference in the vertical GRFs. These results suggest that TFSim might be able to emulate the gait of individuals with TFAmp regarding the majority of spatio-temporal and GRF parameters. However, the vertical GRFs of TFSim should be interpreted with caution.
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Affiliation(s)
- Toshiki Kobayashi
- Department of Biomedical Engineering, Faculty of Engineering, The Hong Kong Polytechnic University, Hong Kong, People's Republic of China
| | - Abu Jor
- Department of Biomedical Engineering, Faculty of Engineering, The Hong Kong Polytechnic University, Hong Kong, People's Republic of China
- Department of Leather Engineering, Faculty of Mechanical Engineering, Khulna University of Engineering & Technology, Khulna, Bangladesh
| | - Yufan He
- Department of Biomedical Engineering, Faculty of Engineering, The Hong Kong Polytechnic University, Hong Kong, People's Republic of China
| | - Mingyu Hu
- Department of Biomedical Engineering, Faculty of Engineering, The Hong Kong Polytechnic University, Hong Kong, People's Republic of China
| | - Mark W. P. Koh
- Department of Biomedical Engineering, Faculty of Engineering, The Hong Kong Polytechnic University, Hong Kong, People's Republic of China
| | - Genki Hisano
- Faculty of Advanced Engineering, Tokyo University of Science, Tokyo, Japan
- Japan Society for the Promotion of Science (JSPS), Tokyo, Japan
| | - Takeshi Hara
- Faculty of Advanced Engineering, Tokyo University of Science, Tokyo, Japan
| | - Hiroaki Hobara
- Faculty of Advanced Engineering, Tokyo University of Science, Tokyo, Japan
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Berglund P, Andonov S, Strandberg E, Eriksson S. Should performance at different race lengths be treated as genetically distinct traits in Coldblooded trotters? J Anim Breed Genet 2024; 141:220-234. [PMID: 38009381 DOI: 10.1111/jbg.12837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 11/10/2023] [Accepted: 11/15/2023] [Indexed: 11/28/2023]
Abstract
Speed, in the form of racing time per kilometre (km), is a performance trait of the Swedish-Norwegian Coldblooded trotter included in the joint Swedish-Norwegian genetic evaluation. A few popular stallions have dominated Coldblooded trotter breeding, which has led to an increasing average relationship between individuals in the population. This study investigated the scope for broadening the breeding goal by selecting for racing time per km over different race lengths (short: 1640 m, medium: 2140 m and long: 2640 m), as this could encourage the use of breeding sires that are less related to the population. Performance data on three- to 12-year-old Coldblooded trotters in all Swedish races run 1995-2021 were obtained from the Swedish Trotting Association. These data consisted of 46,356 observations for 8375 horses in short-distance races, 430,512 observations for 11,193 horses in medium-distance races and 11,006 observations for 3341 horses in long-distance races. Variance components and genetic correlations were calculated using a trivariate animal model with Gibbs sampling from the BLUPF90 suite of programs. Breeding values for the three traits were then estimated using univariate animal models with the same fixed and random effects as in the trivariate model. Heritability estimates of 0.27-0.28 and genetic correlations between racing time per km at the different distances of 0.97-0.99 were obtained. Despite the strong genetic correlation between the traits, there was some re-ranking among the top 10 and top 30 stallions based on distance-specific breeding values. Estimated rank correlation between breeding values for racing time per km in short- and medium-distance races was 0.86, while between short- and long-distance races and between medium- and long-distance races it was 0.61. Mean relationship within the top 10 and top 30 stallions based on breeding values for racing time per km at each distance was 0.31-0.33 and 0.23-0.24 while mean relationship to the rest of the population ranged from 0.17 to 0.18 for all groups, although the 10 and 30 top-ranking stallions differed somewhat in the traits. Estimated average increase in inbreeding was 0.1% per year of birth and 1.2% per generation. The strong genetic correlation between racing time per km at different distances did not support their use as genetically distinct traits. Re-ranking of stallions for racing time per km at different race lengths could favour the use of a larger number of stallions in breeding, but according to our results it would not promote the use of stallions that are less related to the total population. Other traits like longevity or health traits, for example, career length and orthopaedic status, may be more relevant in broadening the breeding goal and preventing a few sires dominating future breeding, and this would be interesting to study further.
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Affiliation(s)
- Paulina Berglund
- Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Sreten Andonov
- Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Erling Strandberg
- Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Susanne Eriksson
- Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Uppsala, Sweden
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Shoemaker S, Wang Y, Sellon D, Gold J, Fisher A, Bagshaw J, Leguillette R, Sanz M, Bayly W. Prevalence and severity of exercise-induced pulmonary hemorrhage in 2-year-old Thoroughbred racehorses and its relationship to performance. J Vet Intern Med 2024; 38:1167-1176. [PMID: 38363079 PMCID: PMC10937470 DOI: 10.1111/jvim.17003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Accepted: 01/22/2024] [Indexed: 02/17/2024] Open
Abstract
BACKGROUND Little has been reported regarding the prevalence and severity of exercise-induced pulmonary hemorrhage (EIPH) in 2-year-old Thoroughbred racehorses. OBJECTIVES Evaluate EIPH prevalence and severity and its association with performance, speed index, furosemide administration, race distance, and track surface. ANIMALS A total of 830 2-year-old Thoroughbreds. METHODS Prospective blinded observational study. Videoendoscopy was performed 30 to 60 minutes postrace at 15 American racetracks. Three blinded observers independently assigned an EIPH grade (0-4) to each video, and prevalence and severity of EIPH were determined. Relationships of EIPH grade to performance, speed index, race distance, track surface, and prerace administration of furosemide were evaluated using Pearson's chi-squared test for categorical variables and analysis of variance (ANOVA) for numerical variables. Multivariable logistic regression assessed relationships between EIPH prevalence and severity, respectively, and the aforementioned independent variables. A P < .05 was considered significant. RESULTS A total of 1071 tracheoendoscopies were recorded. The EIPH prevalence was 74% and for EIPH grade ≥3 was 8%. Speed index (P = .02) and finishing place (P = .004) were lower with EIPH ≥3. The EIPH prevalence and severity were lower at 2 tracks where postrace tracheoendoscopy was mandatory rather than voluntary (P < .001). Probability of observing EIPH was negatively associated with speed index (P = .01) at tracks where postrace tracheoendoscopy was mandatory. Prerace furosemide administration decreased the probability of EIPH occurrence (P = .007) and severity (P = .01) where study participation was voluntary. CONCLUSIONS AND CLINICAL IMPORTANCE Prevalence and severity of EIPH in 2-year-old racehorses were consistent with that of older racehorses. An EIPH grade ≥3 was associated with decreased performance. Prerace furosemide administration was associated with a decreased likelihood, but not severity, of EIPH at most tracks.
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Affiliation(s)
- Sierra Shoemaker
- Department of Veterinary Clinical SciencesWashington State UniversityPullmanWashingtonUSA
| | - Yuan Wang
- Center for Interdisciplinary Statistical Education and ResearchWashington State UniversityPullmanWashingtonUSA
| | - Debra Sellon
- Department of Veterinary Clinical SciencesWashington State UniversityPullmanWashingtonUSA
| | - Jenifer Gold
- Department of Veterinary Clinical SciencesWashington State UniversityPullmanWashingtonUSA
| | - Allison Fisher
- Center for Interdisciplinary Statistical Education and ResearchWashington State UniversityPullmanWashingtonUSA
| | - Julia Bagshaw
- Department of Veterinary Clinical SciencesWashington State UniversityPullmanWashingtonUSA
| | - Renaud Leguillette
- Department of Veterinary Clinical and Diagnostic Sciences, Faculty of Veterinary MedicineUniversity of CalgaryCalgaryAlbertaCanada
| | - Macarena Sanz
- Department of Veterinary Clinical SciencesWashington State UniversityPullmanWashingtonUSA
| | - Warwick Bayly
- Department of Veterinary Clinical SciencesWashington State UniversityPullmanWashingtonUSA
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13
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Rassam R, Chen Q, Gai Y. Competing Visual Cues Revealed by Electroencephalography: Sensitivity to Motion Speed and Direction. Brain Sci 2024; 14:160. [PMID: 38391734 PMCID: PMC10886893 DOI: 10.3390/brainsci14020160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 01/25/2024] [Accepted: 02/02/2024] [Indexed: 02/24/2024] Open
Abstract
Motion speed and direction are two fundamental cues for the mammalian visual system. Neurons in various places of the neocortex show tuning properties in term of firing frequency to both speed and direction. The present study applied a 32-channel electroencephalograph (EEG) system to 13 human subjects while they were observing a single object moving with different speeds in various directions from the center of view to the periphery on a computer monitor. Depending on the experimental condition, the subjects were either required to fix their gaze at the center of the monitor while the object was moving or to track the movement with their gaze; eye-tracking glasses were used to ensure that they followed instructions. In each trial, motion speed and direction varied randomly and independently, forming two competing visual features. EEG signal classification was performed for each cue separately (e.g., 11 speed values or 11 directions), regardless of variations in the other cue. Under the eye-fixed condition, multiple subjects showed distinct preferences to motion direction over speed; however, two outliers showed superb sensitivity to speed. Under the eye-tracking condition, in which the EEG signals presumably contained ocular movement signals, all subjects showed predominantly better classification for motion direction. There was a trend that speed and direction were encoded by different electrode sites. Since EEG is a noninvasive and portable approach suitable for brain-computer interfaces (BCIs), this study provides insights on fundamental knowledge of the visual system as well as BCI applications based on visual stimulation.
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Affiliation(s)
- Rassam Rassam
- Biomedical Engineering, School of Science and Engineering, Saint Louis University, St. Louis, MO 63103, USA
| | - Qi Chen
- Biomedical Engineering, School of Science and Engineering, Saint Louis University, St. Louis, MO 63103, USA
| | - Yan Gai
- Biomedical Engineering, School of Science and Engineering, Saint Louis University, St. Louis, MO 63103, USA
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14
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Hysenaj A, Leclère M, Tahirbegolli B, Kuqi D, Isufi A, Prekazi L, Shemsedini N, Maljichi D, Meha R. Accuracy and Speed of Emotion Recognition With Face Masks. Eur J Psychol 2024; 20:16-24. [PMID: 38487600 PMCID: PMC10936662 DOI: 10.5964/ejop.11789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Accepted: 11/28/2023] [Indexed: 03/17/2024]
Abstract
Wearing face masks is one of the important actions to prevent the spread of COVID-19 among people around the world. Nevertheless, social interaction is limited via masks, and this impacts the accuracy and speed of emotional perception. In the present study, we assess the impact of mask-wearing on the accuracy and speed of emotion recognition. Fifty people (female n = 39, male n = 11) aged 19-28 participated in the study (M = 21.1 years). We used frontal photos of a Kosova woman who belonged to the same participants' age group, with a grey background. Twelve different pictures were used that showed the emotional states of fear, joy, sadness, anger, neutrality, and disgust, in masked and unmasked conditions. The experiment was conducted in a controlled laboratory setting. Participants were faster for identifying emotions like joy (1.507 ms) and neutral (1.971 ms). The participants were more accurate (emotions identification) in unmasked faces (M = 85.7%) than in masked faces (M = 73.8%), F(1,98) = 20.73, MSE = 1027.66, p ≤ .001, partial η² = 0.17. Masks make confusion and reduce the accuracy and speediness of emotional detection. This may have a notable impact on social interactions among peoples.
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Affiliation(s)
- Arben Hysenaj
- Faculty of Social and Psychological Sciences, Heimerer College, Prishtina, Kosovo
- Department of Clinical Psychology and Health Psychology, University of Bamberg, Germany
| | - Mariel Leclère
- Faculty of Social and Psychological Sciences, Heimerer College, Prishtina, Kosovo
- Department of Cognitive Psychology, Aix-Marseille University, Marseille, France
| | - Bernard Tahirbegolli
- Faculty of Social and Psychological Sciences, Heimerer College, Prishtina, Kosovo
- National Sports Medicine Center, Prishtine, Kosovo
| | - Dorentina Kuqi
- Faculty of Social and Psychological Sciences, Heimerer College, Prishtina, Kosovo
| | - Albane Isufi
- Faculty of Social and Psychological Sciences, Heimerer College, Prishtina, Kosovo
| | - Lulejete Prekazi
- Faculty of Social and Psychological Sciences, Heimerer College, Prishtina, Kosovo
| | - Nevzat Shemsedini
- Faculty of Social and Psychological Sciences, Heimerer College, Prishtina, Kosovo
| | - Driton Maljichi
- Institute for Sociological, Political and Juridical Research, University of Ss. Cyril and Methodius, Skopje, North Macedonia
| | - Rina Meha
- Faculty of Social and Psychological Sciences, Heimerer College, Prishtina, Kosovo
- Institute of Sports and Preventive Medicine, Saarland University, Saarbrücken, Germany
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15
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Cuk I, Markovic S, Weiss K, Knechtle B. Running Variability in Marathon-Evaluation of the Pacing Variables. Medicina (Kaunas) 2024; 60:218. [PMID: 38399506 PMCID: PMC10890654 DOI: 10.3390/medicina60020218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/21/2024] [Accepted: 01/24/2024] [Indexed: 02/25/2024]
Abstract
Background and Objectives: Pacing analyses for increasingly popular long-distance running disciplines have been in researchers' spotlight for several years. In particular, assessing pacing variability in long-distance running was hardly achievable since runners must repeat long-running trials for several days. Potential solutions for these problems could be multi-stage long-distance running disciplines. Therefore, this study aimed to assess the long-distance running variability as well as the reliability, validity, and sensitivity of the variables often used for pacing analyses. Materials and Methods: This study collected the split times and finish times for 20 participants (17 men and three women; mean age 55.5 years ± 9.5 years) who completed the multiday marathon running race (five marathons in 5 days), held as part of the Bretzel Ultra Tri in Colmar, France, in 2021. Seven commonly used pacing variables were subsequently calculated: Coefficient of variation (CV), Change in mean speed (CS), Change in first lap speed (CSF), Absolute change in mean speed (ACS), Pace range (PR), Mid-race split (MRS), and First 32 km-10 km split (32-10). Results: Multi-stage marathon running showed low variability between days (Intraclass correlation coefficient (ICC) > 0.920), while only the CV, ACS, and PR variables proved to have moderate to good reliability (0.732 < ICC < 0.785). The same variables were also valid (r > 0.908), and sensitive enough to discern between runners of different performance levels (p < 0.05). Conclusions: Researchers and practitioners who aim to explore pacing in long-distance running should routinely utilize ACS, CV, and PR variables in their analyses. Other examined variables, CS, CSF, MRS, and 32-10, should be used cautiously. Future studies might try to confirm these results using different multi-stage event's data as well as by expanding sensitivity analysis to age and gender differences.
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Affiliation(s)
- Ivan Cuk
- Faculty of Sport and Physical Education, University of Belgrade, 11000 Belgrade, Serbia
| | - Srdjan Markovic
- Faculty of Physical Education and Sports Management, Singidunum University, 11000 Belgrade, Serbia;
| | - Katja Weiss
- Institute of Primary Care, University of Zurich, 8006 Zurich, Switzerland;
| | - Beat Knechtle
- Institute of Primary Care, University of Zurich, 8006 Zurich, Switzerland;
- Medbase St. Gallen Am Vadianplatz, 9000 St. Gallen, Switzerland
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16
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Chollet M, Delhaye C, Samozino P, Bowen M, Morel B, Monjo F, Hintzy F. The "velocity barrier" in giant slalom skiing: An experimental proof of concept. Scand J Med Sci Sports 2024; 34:e14515. [PMID: 37837209 DOI: 10.1111/sms.14515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 09/22/2023] [Accepted: 09/28/2023] [Indexed: 10/15/2023]
Abstract
BACKGROUND Alpine skiing involves the conversion of potential energy into kinetic energy, with the "velocity barrier" (VB) at each moment corresponding to the maximal velocity at which the athlete can ski while staying within the boundaries of the gates and maintaining control. Nevertheless, this concept has never been proven by evidence. The aim of this study was to experimentally test the existence of the VB and clarify its relationship with skier's force production/application capacities. METHODS Fourteen skiers were equipped with ski-mounted force plates and a positional device and ran a 2-turn Giant Slalom section starting from eight different heights on the slope. Three conditions were selected for further analysis: minimal entrance velocity (vmin ); entrance velocity allowing the better section time (VB); maximal entrance velocity (vmax ). Entrance velocity, section time, mean force output, ratio of force application effectiveness, velocity normalized energy dissipation, and path length were compared between the three conditions. Moreover, skier's mechanical energy and velocity curves were compared all along the section between the three conditions using SPM analysis. RESULTS The section time was reduced in VB compared to vmin (p < 0.001) and vmax (p = 0.002). Skiers presented an incapacity to increase force output beyond the VB (p = 0.441) associated with a lower force application effectiveness (p = 0.005). Maximal entrance velocity was associated to higher energy dissipation (p < 0.001) and path length (p = 0.005). CONCLUSION The present study experimentally supports the existence of the VB. The force production/application capacities seem to limit the skiing effectiveness beyond the VB, associated to increased energy dissipations and path length.
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Affiliation(s)
- Mickael Chollet
- Inter-University Laboratory of Human Movement Sciences, Université Savoie Mont Blanc, Chambéry, France
| | - Clément Delhaye
- Inter-University Laboratory of Human Movement Sciences, Université Savoie Mont Blanc, Chambéry, France
| | - Pierre Samozino
- Inter-University Laboratory of Human Movement Sciences, Université Savoie Mont Blanc, Chambéry, France
| | - Maximilien Bowen
- Inter-University Laboratory of Human Movement Sciences, Université Savoie Mont Blanc, Chambéry, France
| | - Baptiste Morel
- Inter-University Laboratory of Human Movement Sciences, Université Savoie Mont Blanc, Chambéry, France
| | - Florian Monjo
- Inter-University Laboratory of Human Movement Sciences, Université Savoie Mont Blanc, Chambéry, France
| | - Frédérique Hintzy
- Inter-University Laboratory of Human Movement Sciences, Université Savoie Mont Blanc, Chambéry, France
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17
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Jalanko P, Säisänen L, Kallioniemi E, Könönen M, Lakka TA, Määttä S, Haapala EA. Associations between physical fitness and cerebellar gray matter volume in adolescents. Scand J Med Sci Sports 2024; 34:e14513. [PMID: 37814505 DOI: 10.1111/sms.14513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 09/22/2023] [Accepted: 09/25/2023] [Indexed: 10/11/2023]
Abstract
Despite the importance of the developing cerebellum on cognition, the associations between physical fitness and cerebellar volume in adolescents remain unclear. We explored the associations of physical fitness with gray matter (GM) volume of VI, VIIb and Crus I & II, which are cerebellar lobules related to cognition, in 40 (22 females; 17.9 ± 0.8 year-old) adolescents, and whether the associations were sex-specific. Peak oxygen uptake (V̇O2peak ) and power were assessed by maximal ramp test on a cycle ergometer, muscular strength with standing long jump (SLJ), speed-agility with the shuttle-run test (SRT), coordination with the Box and Block Test (BBT) and neuromuscular performance index (NPI) as the sum of SLJ, BBT and SRT z-scores. Body composition was measured using a dual-energy X-ray absorptiometry. Cerebellar volumes were assessed by magnetic resonance imaging. V̇O2peak relative to lean mass was inversely associated with the GM volume of the cerebellum (standardized regression coefficient (β) = -0.038, 95% confidence interval (CI) -0.075 to 0.001, p = 0.044). Cumulative NPI was positively associated with the GM volume of Crus I (β = 0.362, 95% CI 0.045 to 0.679, p = 0.027). In females, better performance in SRT was associated with a larger GM volume of Crus I (β = -0.373, 95% CI -0.760 to -0.028, p = 0.036). In males, cumulative NPI was inversely associated with the GM volume of Crus II (β = -0.793, 95% CI -1.579 to -0.008 p = 0.048). Other associations were nonsignificant. In conclusion, cardiorespiratory fitness, neuromuscular performance and speed-agility were associated with cerebellar GM volume, and the strength and direction of associations were sex-specific.
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Affiliation(s)
- Petri Jalanko
- Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
- Helsinki Clinic for Sports and Exercise Medicine (HULA), Foundation for Sports and Exercise Medicine, Helsinki, Finland
| | - Laura Säisänen
- Department of Technical Physics, University of Eastern Finland, Kuopio, Finland
- Department of Clinical Neurophysiology/Imaging Center, Kuopio University Hospital, Kuopio, Finland
| | - Elisa Kallioniemi
- Department of Clinical Neurophysiology, Kuopio University Hospital, Kuopio, Finland
- Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, New Jersey, USA
| | - Mervi Könönen
- Department of Clinical Radiology, Kuopio University Hospital, Kuopio, Finland
| | - Timo A Lakka
- Institute of Biomedicine, School of Medicine, University of Eastern Finland, Kuopio, Finland
- Department of Clinical Physiology and Nuclear Medicine, Kuopio University Hospital, Kuopio, Finland
- Foundation for Research in Health Exercise and Nutrition, Kuopio Research Institute of Exercise Medicine, Kuopio, Finland
| | - Sara Määttä
- Department of Clinical Neurophysiology, Kuopio University Hospital, Kuopio, Finland
| | - Eero A Haapala
- Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
- Institute of Biomedicine, School of Medicine, University of Eastern Finland, Kuopio, Finland
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18
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Alfaro EL, Shields JE, Zaragoza JA, Dos Santos ML, Dawes JJ, Smith DB. Correlation between Lower-body Strength and Performance Tests among Female NCAA Division II Softball Players. Int J Exerc Sci 2024; 17:212-219. [PMID: 38665858 PMCID: PMC11042884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 04/28/2024]
Abstract
Softball is a sport that requires speed, agility, and lower-body power to be successful. Accordingly, strength and conditioning programs have focused on improving speed and lower-body power, which are beneficial to players performing softball-related tasks. The purpose of this study was to determine the correlation between absolute and relative lower-body strength to performance measures among female collegiate softball players. Archived data collected during pre-season performance testing for twenty-one (n = 21) NCAA Division II collegiate softball players was used for this analysis. Measurements included countermovement jump (CMJ), broad jump (BJ), linear speed (LS), 505 test for change of direction speed (COD), and shuttle runs. Absolute lower body strength (ALBS) was measured using a 3-repetition maximum hex-bar deadlift (HBDL) and body weight was used to calculate relative lower body strength (RLBS) of each player. Pearson's correlation coefficients were used to relate measures of lower body strength to each performance test. Significant (p ≤ 0.05) large to moderate correlations were discovered between RLBS and COD (505L: r = -0.59, 505R: r = -.63), 300 yard (yd) shuttle run time (trial 1: r = -0.47, trial 2: -0.50), and lower-body power (CMJ: r = 0.48, BJ: r = 0.52). ALBS was correlated only to the BJ (r = 0.43). The results suggest that relative strength is related more with COD, shuttle run, and lower-body power when compared to absolute strength. Therefore, strength and conditioning professionals should consider measures of RLBS when administering softball specific tests for developing and implementing a successful strength program in collegiate softball.
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Affiliation(s)
- Elizabeth L Alfaro
- School of Kinesiology, Applied Health, and Recreation, Oklahoma State University, Stillwater, OK, USA
| | - Jocarol E Shields
- School of Kinesiology, Applied Health, and Recreation, Oklahoma State University, Stillwater, OK, USA
| | - Javier A Zaragoza
- School of Kinesiology, Applied Health, and Recreation, Oklahoma State University, Stillwater, OK, USA
- Human Performance Lab, School of Exercise & Sport Science, University of Mary Hardin-Baylor, Belton, TX, USA
| | - Marcel Lopes Dos Santos
- School of Kinesiology, Applied Health, and Recreation, Oklahoma State University, Stillwater, OK, USA
| | - J Jay Dawes
- School of Kinesiology, Applied Health, and Recreation, Oklahoma State University, Stillwater, OK, USA
| | - Douglas B Smith
- School of Kinesiology, Applied Health, and Recreation, Oklahoma State University, Stillwater, OK, USA
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19
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Ristanović L, Cuk I, Villiger E, Stojiljković S, Nikolaidis PT, Weiss K, Knechtle B. The pacing differences in performance levels of marathon and half-marathon runners. Front Psychol 2023; 14:1273451. [PMID: 38187410 PMCID: PMC10771621 DOI: 10.3389/fpsyg.2023.1273451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Accepted: 11/21/2023] [Indexed: 01/09/2024] Open
Abstract
Introduction Many studies indicate a considerable impact of optimal pacing on long-distance running performance. Given that the amount of carbohydrates in metabolic processes increases supralinearly with the running intensity, we may observe differences between the pacing strategies of two long-distance races and different performance levels of runners. Accordingly, the present study aimed to examine the differences in pacing strategies between marathon and half-marathon races regarding the performance levels of runners. Methods The official results and split times from a total of 208,760 (marathon, N = 75,492; half-marathon, N = 133,268) finishers in the "Vienna City Marathon" between 2006 and 2018 were analyzed. The percentage of the average change of speed for each of the five segments (CS 1-5), as well as the absolute change of speed (ACS) were calculated. The CS 1-5 for the marathon are as follows: up to the 10th km, 10th - 20th km, 20th - 30th km, 30th - 40th km, and from the 40th km to the 42.195 km. For the half-marathon, the CS 1-5 are half of the marathon values. Four performance groups were created as quartiles of placement separately for sexes and races: high-level (HL), moderate to high-level (MHL), moderate to low-level (MLL), and low-level (LL). Results Positive pacing strategies (i.e., decrease of speed) were observed in all performance groups of both sex and race. Across CS 1-5, significant main effects (p < 0.001) were observed for the segment, performance level, and their interaction in both sex and race groups. All LL groups demonstrated higher ACS (men 7.9 and 6.05%, as well as women 5.83 and 5.49%, in marathon and half-marathon, respectively), while the HL performance group showed significantly lower ACS (men 4.14 and 2.97%, as well as women 3.16 and 2.77%, in marathon and half-marathon, respectively). Significant main effects (p < 0.001) for the race were observed but with a low effect size in women (ŋ2 = 0.001). Discussion Better runners showed more even pacing than slower runners. The half-marathoners showed more even pacing than the marathoners across all performance groups but with a trivial practical significance in women.
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Affiliation(s)
- Ljubica Ristanović
- Faculty of Sport and Physical Education, University of Belgrade, Belgrade, Serbia
| | - Ivan Cuk
- Faculty of Sport and Physical Education, University of Belgrade, Belgrade, Serbia
| | - Elias Villiger
- Klinik für Allgemeine Innere Medizin, Kantonsspital St. Gallen, St. Gallen, Switzerland
| | | | - Pantelis T. Nikolaidis
- Exercise Physiology Laboratory, Nikaia, Greece
- School of Health and Caring Sciences, University of West Attica, Athens, Greece
| | - Katja Weiss
- Institute of Primary Care, University of Zurich, Zurich, Switzerland
| | - Beat Knechtle
- Institute of Primary Care, University of Zurich, Zurich, Switzerland
- Medbase St. Gallen Am Vadianplatz, St. Gallen, Switzerland
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20
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Glaude-Roy J, Pharand P, Brunelle JF, Lemoyne J. Exploring associations between sprinting mechanical capabilities, anaerobic capacity, and repeated-sprint ability of adolescent ice hockey players. Front Sports Act Living 2023; 5:1258497. [PMID: 38225977 PMCID: PMC10788422 DOI: 10.3389/fspor.2023.1258497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 11/20/2023] [Indexed: 01/17/2024] Open
Abstract
Introduction Sprinting ability and anaerobic capacities are the determinant variables of the performance of ice hockey players. Recent research in sprinting showed the existence of distinct force-velocity (F-V) profiles, but the link between these profiles and anaerobic capacities remains unclear. This study explores the associations between F-V variables and anaerobic capacities among cohorts of highly trained adolescent ice hockey players. Methods Data from 36 men (age, 15.1 ± 0.2 years) and 34 women (age, 16.5 ± 0.7 years) were collected during off-season camps. All athletes completed a 30-m sprint test, a Wingate anaerobic test (WAnT), and a repeated-sprint anaerobic (RSA) test. F-V variables were calculated from the 30-m sprint test. Partial Pearson correlation coefficients for pooled data and Pearson correlation coefficients for individual male and female datasets were calculated. Results Among the F-V variables, maximal theoretical velocity and power were moderately to largely associated with WAnT and RSA performance (|r| = 0.30-0.70). Maximal theoretical force was moderately associated with the RSA (r = -0.32 to -0.33). Discussion The results indicate the importance for highly trained adolescent players to be able to apply force at high velocities to maximize anaerobic capacities. Important differences between male and female players suggest training priorities may differ according to sex.
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Affiliation(s)
- Julien Glaude-Roy
- Department of Human Kinetics, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
| | - Philippe Pharand
- Laboratoire de Recherche sur le Hockey, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
| | - Jean-François Brunelle
- Laboratoire de Recherche sur le Hockey, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
- Service de l'Activité Physique et Sportive, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
| | - Jean Lemoyne
- Department of Human Kinetics, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
- Laboratoire de Recherche sur le Hockey, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
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21
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Wang L, Lin L, Ren J. The characteristics of audiovisual temporal integration in streaming-bouncing bistable motion perception: considering both implicit and explicit processing perspectives. Cereb Cortex 2023; 33:11541-11555. [PMID: 37874024 DOI: 10.1093/cercor/bhad388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 10/01/2023] [Accepted: 10/02/2023] [Indexed: 10/25/2023] Open
Abstract
This study explored the behavioral and neural activity characteristics of audiovisual temporal integration in motion perception from both implicit and explicit perspectives. The streaming-bouncing bistable paradigm (SB task) was employed to investigate implicit temporal integration, while the corresponding simultaneity judgment task (SJ task) was used to examine explicit temporal integration. The behavioral results revealed a negative correlation between implicit and explicit temporal processing. In the ERP results of both tasks, three neural phases (PD100, ND180, and PD290) in the fronto-central region were identified as reflecting integration effects and the auditory-evoked multisensory N1 component may serve as a primary component responsible for cross-modal temporal processing. However, there were significant differences between the VA ERPs in the SB and SJ tasks and the influence of speed on implicit and explicit integration effects also varied. The aforementioned results, building upon the validation of previous temporal renormalization theory, suggest that implicit and explicit temporal integration operate under distinct processing modes within a shared neural network. This underscores the brain's flexibility and adaptability in cross-modal temporal processing.
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Affiliation(s)
- Luning Wang
- School of Psychology, Shanghai University of Sport, No. 399, Changhai Road, Yangpu District, Shanghai, 200438, China
| | - Liyue Lin
- School of Psychology, Shanghai University of Sport, No. 399, Changhai Road, Yangpu District, Shanghai, 200438, China
| | - Jie Ren
- China Table Tennis College, Shanghai University of Sport, No. 399, Changhai Road, Yangpu District, Shanghai, 200438, China
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Massuça LM, Monteiro L, Coutinho G, Santos V. Four-Year Training Course for Police Officers (CFOP) and Fitness Outcomes of Police Academy Cadets: A Cohort Study from 2004 to 2020. Healthcare (Basel) 2023; 11:2901. [PMID: 37958045 PMCID: PMC10650632 DOI: 10.3390/healthcare11212901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 10/31/2023] [Accepted: 10/31/2023] [Indexed: 11/15/2023] Open
Abstract
This study examines the effect of gender, age, and a 4-year training course for police officers (CFOP) on the physical fitness attributes of Portuguese police academy cadets. This longitudinal cohort study considered 686 police cadets (female, n = 131; male, n = 555 male), corresponding to 2578 fitness assessments (female, n = 509; male, n = 2069). The database of police cadets' physical fitness evaluations (from 2004/2005 to 2019/2020) comprises body size, speed, agility, strength, flexibility, and aerobic capacity first assessment (T0) and evaluations at the end of the first four years of the CFOP (T1, T2, T3, T4). Results showed that (i) female cadets are younger (p < 0.05), shorter, lighter, less fast, less agile, less strong, and perform worse in aerobic capacity assessments than male cadets (all, p < 0.001) but perform better in the flexibility assessment (p < 0.001); (ii) female cadets > 29 years are significantly heavier, slower, jump less, perform fewer sit-ups, and perform less on the Cooper test (but they have more handgrip strength), and male cadets > 29 years are significantly heavier, slower, jump less, perform fewer sit-ups, and have less flexibility and aerobic capacity (still, they have superior back and lumbar strength and handgrip strength); and (iii) from T0 to T4 (Δ), female cadets are significantly faster (60 m, -0.32 s; slalom, -0.78 s), jump further (+4 cm), have more abdominal strength endurance (+2.6 repetitions) and more back and lumbar strength (+89.8 kg), and male cadets are significantly heavier (+3.27 kg), faster (60 m, -0.23 s; 30 m, -0.15 s; slalom, -0.91 s), jump further (+8 cm), complete more repetitions in the sit-ups (+4.9 repetitions) and in pull-ups (+2.5 repetitions) and have more back and lumbar strength (+92.1 kg) and handgrip strength (+8.6 kg) but a lower aerobic capacity (Cooper test, -74.8 m; VO2max, -1.3 mL/kg/min) when compared to T0. The study's findings lead to widely accepted conclusions within the discipline. Nevertheless, this work provides valuable insights into the impact of various factors on the physical fitness of Portuguese police academy cadets, i.e.: (i) it is an essential study with practical implications for recruitment, training, and the ongoing development of Portuguese police academy cadets and police officers; and (ii) these results can also assist in tailoring training programs to different age groups and genders, which is crucial in police training.
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Affiliation(s)
- Luís Miguel Massuça
- Higher Institute of Police Sciences and Internal Security, 1300-663 Lisbon, Portugal
- ICPOL, Higher Institute of Police Sciences and Internal Security, 1300-663 Lisbon, Portugal
- First Responder Research Laboratory, University of Kentucky, Lexington, KY 40506, USA
- CIDEFES, Lusófona University, 1749-024 Lisbon, Portugal
- CIFI2D, Faculty of Sport, University of Porto, 4200-450 Porto, Portugal
| | - Luís Monteiro
- ICPOL, Higher Institute of Police Sciences and Internal Security, 1300-663 Lisbon, Portugal
- First Responder Research Laboratory, University of Kentucky, Lexington, KY 40506, USA
- CIDEFES, Lusófona University, 1749-024 Lisbon, Portugal
| | - Gabriel Coutinho
- Higher Institute of Police Sciences and Internal Security, 1300-663 Lisbon, Portugal
| | - Vanessa Santos
- ICPOL, Higher Institute of Police Sciences and Internal Security, 1300-663 Lisbon, Portugal
- First Responder Research Laboratory, University of Kentucky, Lexington, KY 40506, USA
- Exercise and Health Laboratory, CIPER, Faculty of Human Kinetics, University of Lisbon, 1495-751 Cruz Quebrada, Portugal
- KinesioLab, Research Unit in Human Movement Analysis, Instituto Piaget, 2805-059 Almada, Portugal
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Moran J, Allen M, Butson J, Granacher U, Hammami R, Clemente FM, Klabunde M, Sandercock G. How effective are external cues and analogies in enhancing sprint and jump performance in academy soccer players? J Sports Sci 2023; 41:2054-2061. [PMID: 38303114 DOI: 10.1080/02640414.2024.2309814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 01/18/2024] [Indexed: 02/03/2024]
Abstract
This study investigated the effect of external (EC) and internal coaching cues (IC), analogies with a directional component (ADC) on sprint (20 m) and vertical jump performance in academy soccer players (n = 20). A repeated-measures analysis, with post-hoc comparisons, was used to identify any differences between these cues and a neutral (control) cue. Significant differences were found for both sprint (p < 0.001) and jump (p = 0.022) comparisons among cue types. In post-hoc analyses for the 20 m sprint, significant differences were observed between the EC and the IC, favouring the EC (p < 0.01, ES = 1.27 [CI: 0.24, 2.30]), and "away" ADC and the IC, favouring the "away" ADC (p < 0.01, ES = 1.21 [CI: 0.19, 2.22]). No other cues showed significant differences. For vertical jump, there was just one significant difference between comparisons, that being for the "away" ADC vs. the neutral cue, favouring the latter (p = 0.023, ES = 0.4 [CI: -0.04 to 0.84]). It appears that ECs and ADCs are most effective when coaching sprinting performance in academy soccer players. However, simply encouraging maximal effort from a youth athlete also appears to be a reasonable cueing strategy to drive performance in youth athletes.
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Affiliation(s)
- Jason Moran
- School of Sport, Rehabilitation, and Exercise Sciences, University of Essex, Colchester, UK
| | - Matt Allen
- Tottenham Hotspur Football Club, London, UK
| | - Joshua Butson
- School of Sport, Rehabilitation, and Exercise Sciences, University of Essex, Colchester, UK
| | - Urs Granacher
- Department of Sport and Sport Science, University of Freiburg, Breisgau, Germany
| | - Raouf Hammami
- Tunisian Research Laboratory 'Sports Performance Optimization (LR09SEP01), National Center of Medicine and Science in Sports (CNMSS), Tunis, TunisiaResearch Laboratory: Education, Motor Skills, Sports and Health, Higher Institute of Sport and Physical Education of Sfax, University of Sfax, Sfax, Tunisia
- Higher Institute of Sport and Physical Education of Ksar-said, University of la Manouba, Tunis, Tunisia
| | - Filipe Manuel Clemente
- Escola Superior de Desporto e Lazer, Instituto Politécnico de Viana do Castelo, Viana do Castelo, Portugal
- Instituto de Telecomunicações, Delegação da Covilhã, Lisboa, Portugal
| | - Megan Klabunde
- Department of Psychology, University of Essex, Colchester, UK
| | - Gavin Sandercock
- School of Sport, Rehabilitation, and Exercise Sciences, University of Essex, Colchester, UK
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Sember V, Đurić S, Starc G, Leskošek B, Sorić M, Kovač M, Jurak G. Secular trends in skill-related physical fitness among Slovenian children and adolescents from 1983 to 2014. Scand J Med Sci Sports 2023; 33:2323-2339. [PMID: 37493345 DOI: 10.1111/sms.14456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 05/31/2023] [Accepted: 07/10/2023] [Indexed: 07/27/2023]
Abstract
It is vital from the public health and educational perspective to be familiar with changes in the fitness levels of individuals and populations since fitness is associated with several health outcomes and cognition. Skill-related physical fitness refers to performance in sports or occupation and is associated with motor skill performance. The aim of the present study was to examine secular trends in skill-related physical fitness of 16 678 participants in four youth generations of Slovenian children and adolescents in years 1983 (n = 3128), 1993/94 (n = 3413), 2003/04 (n = 5497), and 2013/14 (n = 4640). Using repeated cross-sectional design, we observed fitness level of all participants divided into three age groups: 6-10, 11-14, and 15-19 years. Skill-related physical performance was measured with seven fitness tests for speed, coordination, balance, and flexibility. Analysis of covariance was used to compare differences in fitness performance between decades in each age and sex group, adjusted for body height, body weight, and body mass index. Overall, large but inconsistent changes in coordination, a small improvement in speed, and a decline in flexibility were seen. The trends over the whole examined period were not linear throughout decades. Generally, positive trends were noticed in periods 1983-1993 (range 1.4%-17.9%; except flexibility) and 2003/04-2013/14 (range 0.2%-36.4%; except age group 15-19 years) while in the period 1993/94-2003/04 there are some particularities in secular trends according to individual components as well as age groups. In general, the secular trend showed a positive direction for both genders (p < 0.05), except for gross motor coordination, which demonstrated positive trends in 1993 and 2013 compared with a decade earlier (p < 0.05) and from 1983 to 2013/14, except for the youngest boys in 2003 and the youngest girls from 1993 to 2003 (p < 0.05). Our findings call for exercise programs aimed at improving speed and gross motor coordination in both sexes and all age groups, especially in the group of 15-19 years old.
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Affiliation(s)
- Vedrana Sember
- Faculty of Sports, University of Ljubljana, Ljubljana, Slovenia
| | - Saša Đurić
- American University of the Middle East, Al-Egaila, Kuwait
| | - Gregor Starc
- Faculty of Sports, University of Ljubljana, Ljubljana, Slovenia
| | - Bojan Leskošek
- Faculty of Sports, University of Ljubljana, Ljubljana, Slovenia
| | - Maroje Sorić
- Faculty of Sports, University of Ljubljana, Ljubljana, Slovenia
- Faculty for Kinesiology, University of Zagreb, Zagreb, Croatia
| | - Marjeta Kovač
- Faculty of Sports, University of Ljubljana, Ljubljana, Slovenia
| | - Gregor Jurak
- Faculty of Sports, University of Ljubljana, Ljubljana, Slovenia
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Panascì M, Di Gennaro S, Ferrando V, Filipas L, Ruggeri P, Faelli E. Efficacy of Resisted Sled Sprint Training Compared With Unresisted Sprint Training on Acceleration and Sprint Performance in Rugby Players: An 8-Week Randomized Controlled Trial. Int J Sports Physiol Perform 2023; 18:1189-1195. [PMID: 37536676 DOI: 10.1123/ijspp.2023-0103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 06/13/2023] [Accepted: 06/21/2023] [Indexed: 08/05/2023]
Abstract
PURPOSE To compare the effects between resisted sled sprint training (RSS) and unresisted sprint training (URS) on sprint and acceleration performance, vertical jump, and maximal strength during an 8-week period of preseason training. METHODS Twenty-six recreational active rugby players were randomly divided into either RSS or URS training groups and then performed 8 weeks of training, 2 sessions/wk of sprint-specific training program. The RSS group performed sprints by towing a sled overloaded with 12.6% of body mass for 2 of the 3 sets of 3 × 20-m sprints, plus one set was carried out with unresisted modality. The URS groups performed 3 sets of 3 × 20-m unresisted sprints. The measures of 10- and 30-m sprint times, vertical jump, and 3-repetition-maximum (3-RM) squat tests were performed at baseline and after 8 weeks. RESULTS Ten- and 30-m sprint times (P < .05 and ηp2>.44) improved significantly more in RSS than in URS. Both groups improved significantly in vertical jump and 3-RM squat tests; however, no significant differences (P > .1 and ηp2<.11) between groups were found. CONCLUSIONS Our findings indicate that an 8-week program of RSS is more effective than URS for enhancing sprint time performance in male recreational active rugby players. In addition, these data suggest that a sled overload corresponding to 12.6% of body mass can induce positive effects on both acceleration and speed performance in recreational active rugby players.
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Affiliation(s)
- Marco Panascì
- Section of Human Physiology, Department of Experimental Medicine, Università degli Studi di Genova, Genoa,Italy
- Centro Polifunzionale di Scienze Motorie, Università degli Studi di Genova, Genoa,Italy
| | - Simone Di Gennaro
- Centro Polifunzionale di Scienze Motorie, Università degli Studi di Genova, Genoa,Italy
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genoa, Genoa,Italy
| | - Vittoria Ferrando
- Section of Human Physiology, Department of Experimental Medicine, Università degli Studi di Genova, Genoa,Italy
- Centro Polifunzionale di Scienze Motorie, Università degli Studi di Genova, Genoa,Italy
| | - Luca Filipas
- Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milano,Italy
- Department of Endocrinology, Nutrition and Metabolic Diseases, IRCCS MultiMedica, Milano,Italy
| | - Piero Ruggeri
- Section of Human Physiology, Department of Experimental Medicine, Università degli Studi di Genova, Genoa,Italy
- Centro Polifunzionale di Scienze Motorie, Università degli Studi di Genova, Genoa,Italy
| | - Emanuela Faelli
- Section of Human Physiology, Department of Experimental Medicine, Università degli Studi di Genova, Genoa,Italy
- Centro Polifunzionale di Scienze Motorie, Università degli Studi di Genova, Genoa,Italy
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Cardoso P, Tavares F, Loureiro N, Ferreira R, Araújo JP, Reis J, Vaz JR. In-situ acceleration- speed profile of an elite soccer academy: A cross-sectional study. J Sports Sci 2023; 41:1868-1874. [PMID: 38240501 DOI: 10.1080/02640414.2024.2305005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 01/03/2024] [Indexed: 02/19/2024]
Abstract
Speed is an essential skill in sports performance and an important performance metric in talent identification. This study aims to evaluate and compare the sprint acceleration characteristics across different age groups in an elite soccer academy. A total of 141 elite academy soccer players were recruited to participate in the study, and they were assigned to their respective competitive age groups, ranging from under-14 to the B-team. An individual in-situ acceleration-speed (A-S) profile was assessed and derived from Global Position System (GPS) speed-acceleration raw data, from 10 consecutive football sessions, in the beginning of the season. The results showed that under-14 players exhibited significantly lower theoretical maximum speed (S0) (η p 2 = 0.215, p < 0.01) when compared with all other age groups. However, no differences were found between maximum theoretical acceleration (A0) and A-S slope between age groups. The results suggest that sprint mechanical profiles of young soccer athletes remain stable throughout their athletic development. Nevertheless, younger athletes have less capacity to apply horizontal force at higher speeds (S0).
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Affiliation(s)
- Pedro Cardoso
- Laboratory of Physiology and Biochemistry of Exercise, Faculdade de Motricidade Humana, Universidade de Lisboa, Lisbon, Portugal
- Medical and Performance Department, Sporting Clube Portugal SAD, Lisboa, Portugal
| | - Francisco Tavares
- Medical and Performance Department, Sporting Clube Portugal SAD, Lisboa, Portugal
| | - Nuno Loureiro
- Medical and Performance Department, Sporting Clube Portugal SAD, Lisboa, Portugal
| | - Ruben Ferreira
- Medical and Performance Department, Sporting Clube Portugal SAD, Lisboa, Portugal
| | - João Pedro Araújo
- Medical and Performance Department, Sporting Clube Portugal SAD, Lisboa, Portugal
| | - Joana Reis
- Laboratory of Physiology and Biochemistry of Exercise, Faculdade de Motricidade Humana, Universidade de Lisboa, Lisbon, Portugal
- CIPER, Faculdade de Motricidade Humana, Universidade de Lisboa, Lisboa, Portugal
- Portugal Football School, Portuguese Football Federation (FPF), Cruz-Quebrada, Portugal
| | - João R Vaz
- CIPER, Faculdade de Motricidade Humana, Universidade de Lisboa, Lisboa, Portugal
- Egas Moniz Interdisciplinary Research Centre, Egas Moniz School of Health & Science, Monte de Caparica, Portugal
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Negro C, Baiget E, Colomar J, Fuentes-García JP. Effects of 4 Weeks of Variability Training on Forehand Approach Precision and Velocity in Recreational Tennis Players. Motor Control 2023; 27:705-716. [PMID: 37024108 DOI: 10.1123/mc.2022-0128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 01/10/2023] [Accepted: 01/31/2023] [Indexed: 04/08/2023]
Abstract
This study aims to analyze the effects of a training program based on practice variability on the speed and accuracy of the tennis forehand approach to the net shot. The study sample consisted of 35 players of both genders, 22 men and 13 women (age 44 ± 10.9 years, height 1.73 ± 0.8 cm, and weight 74.7 ± 8.4 kg). Players were randomly distributed into two groups (control group = 18 and experimental group = 17). Both training groups worked a total volume of 4 weeks, seven sessions, and 15 min per session of forehand approach shot. Control group performed traditional training while experimental group trained with variability using wristband weights. The data obtained showed a large Group × Time interaction in the accuracy of the forehand approach shot, F(1, 16) = 28.034, p < .001, η2 = .637. Only the experimental group increased significantly in the accuracy after the program (51.4%, effect size = 1.3, p < .001), while no changes were achieved regarding hitting speed (1.2%, effect size = 0.12, p = .62). The control group did not improve in any of the tested variables. These results indicate that variability of training using wrist weights is a valid option to improve forehand approach shot accuracy in recreational-level players. Although stroke speed was not increased, this type of training may be interesting as accuracy and technical control is commonly the main goal of training at this level.
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Affiliation(s)
- Celia Negro
- Faculty of Sport Science, University of Extremadura, Cáceres,Spain
| | - Ernest Baiget
- National Institute of Physical Education of Catalonia (INEFC), University of Barcelona (UB), Barcelona,Spain
| | - Joshua Colomar
- Sport and Physical Activity Studies Centre (CEEAF), University of Vic-Central University of Catalonia, Barcelona,Spain
- Sport, Exercise, and Human Movement (SEaHM), University of Vic-Central University of Catalonia, Barcelona,Spain
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Vantieghem-Nicolas L, Morin JB, Cotte T, Sangnier S, Rossi J. Concurrent Validity and Reliability of the Sprint Force-Velocity Profile Assessed with K-AI Wearable Tech. Sensors (Basel) 2023; 23:8189. [PMID: 37837018 PMCID: PMC10575115 DOI: 10.3390/s23198189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 09/10/2023] [Accepted: 09/26/2023] [Indexed: 10/15/2023]
Abstract
Establishing a sprint acceleration force-velocity profile is a way to assess an athlete's sprint-specific strength and speed production capacities. It can be determined in field condition using GNSS-based (global navigation satellite system) devices. The aims of this study were to (1) assess the inter-unit and the inter-trial reliability of the force-velocity profile variables obtained with K-AI Wearable Tech devices (50 Hz), (2) assess the concurrent validity of the input variables (maximal sprint speed and acceleration time constant), and (3) assess the validity of the output variables (maximal force output, running velocity and power). Twelve subjects, including one girl, performed forty-one 30 m sprints in total, during which the running speed was measured using two GPS (global positioning system) devices placed on the upper back and a radar (Stalker® Pro II Sports Radar Gun). Concurrent validity, inter-device and inter-trial reliability analyses were carried out for the input and output variables. Very strong to poor correlation (0.99 to 0.38) was observed for the different variables between the GPS and radar devices, with typical errors ranging from small to large (all < 7.6%). Inter-unit reliability was excellent to moderate depending on the variable (ICC values between 0.65 and 0.99). Finally, for the inter-trial reliability, the coefficients of variation were low to very low (all < 5.6%) for the radar and the GPS. The K-AI Wearable Tech used in this study is a concurrently valid and reliable alternative to radar for assessing a sprint acceleration force-velocity profile.
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Affiliation(s)
- Laurine Vantieghem-Nicolas
- Université Jean Monnet Saint-Etienne, Lyon 1, Université Savoie Mont-Blanc, Laboratoire Interuniversitaire de Biologie de la Motricité, F-42023 Saint-Etienne, France; (L.V.-N.); (S.S.); (J.R.)
| | - Jean-Benoit Morin
- Université Jean Monnet Saint-Etienne, Lyon 1, Université Savoie Mont-Blanc, Laboratoire Interuniversitaire de Biologie de la Motricité, F-42023 Saint-Etienne, France; (L.V.-N.); (S.S.); (J.R.)
| | - Thierry Cotte
- ASSE, Cellule d’aide à la Performance, F-42000 Saint-Etienne, France
| | - Sébastien Sangnier
- Université Jean Monnet Saint-Etienne, Lyon 1, Université Savoie Mont-Blanc, Laboratoire Interuniversitaire de Biologie de la Motricité, F-42023 Saint-Etienne, France; (L.V.-N.); (S.S.); (J.R.)
| | - Jeremy Rossi
- Université Jean Monnet Saint-Etienne, Lyon 1, Université Savoie Mont-Blanc, Laboratoire Interuniversitaire de Biologie de la Motricité, F-42023 Saint-Etienne, France; (L.V.-N.); (S.S.); (J.R.)
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Bournival M, Martini G, Trudeau F, Lemoyne J. The science and art of testing in ice hockey: a systematic review of twenty years of research. Front Sports Act Living 2023; 5:1252093. [PMID: 37841888 PMCID: PMC10569309 DOI: 10.3389/fspor.2023.1252093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Accepted: 09/04/2023] [Indexed: 10/17/2023] Open
Abstract
Introduction Ice hockey is a complex sport requiring multiple athletic and technical attributes. Considering the variety of tests developed, on-ice testing protocols have been created to measure the physiological and mechanical attributes associated with performance. To our knowledge, a lack of technical resources exists to help stakeholders opt for on-ice protocols from among those developed. It becomes crucial for researchers and practitioners to select relevant and context-specific procedures. This systematic review of the literature outlines an inventory of the on-ice tests that have been used in the domain of ice hockey research over the last twenty years, and summarize protocols mostly used in major athletic components. Methods A search was performed on three databases (PubMed, SPORTDiscus and Scopus) by following the PRISMA guidelines. Specific keywords were selected to find publications using on-ice testing protocols in the methodology. Four aspects of athletic attributes were used to categorize the protocols: aerobic capacity, acceleration-speed, agility-change of direction and ability to repeat skating sprints. Analyses were conducted regarding four categories of observations: population under study, on-ice reported test(s), outcomes measures and main findings. Results A total of 107 articles were included, resulting in 55 on-ice tests related to the on-ice assessments of four major athletic components: aerobic capacity (n = 7), acceleration-speed (n = 6), agility and change of direction (n = 23) and repeated skating sprint ability (n = 19). Testing in male and older cohorts (≥16 years old) predominates, with a primary focus on the competitive amateur level. The selected tests were mainly designed for assessing on-ice physiological responses and fitness (n = 38), talent identification-team selection (n = 19), efficiency of interventions (n = 17) and validation purposes (n = 16). Conclusion A prevalence of on-ice skating tests to assess the ability to repeat intense efforts, agility, acceleration and speed components exists, which are relevant and linked to match requirement. The wealth of on-ice tests used in the literature reflects the need to adapt the on-ice evaluation process to the population, constraints, and goals. This review is a valid toolbox and can benefit for researchers and practitioners interested in testing hockey players from different levels, with a variety of aims and needs, by helping them to select the relevant procedures to their environment and practice context.
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Affiliation(s)
- Michael Bournival
- Laboratoire de recherche sur le hockey UQTR, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
- Department of Human Kinetics, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
| | - Gaëtan Martini
- Laboratoire de recherche sur le hockey UQTR, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
- Department of Human Kinetics, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
| | - François Trudeau
- Department of Human Kinetics, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
| | - Jean Lemoyne
- Laboratoire de recherche sur le hockey UQTR, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
- Department of Human Kinetics, Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
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Evans RJ, Moffit TJ, Mitchell PK, Pamukoff DN. Injury and performance related biomechanical differences between recreational and collegiate runners. Front Sports Act Living 2023; 5:1268292. [PMID: 37780121 PMCID: PMC10536965 DOI: 10.3389/fspor.2023.1268292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 09/04/2023] [Indexed: 10/03/2023] Open
Abstract
Introduction Running related injuries (RRI) are common, but factors contributing to running performance and RRIs are not commonly compared between different types of runners. Methods We compared running biomechanics previously linked to RRIs and performance between 27 recreational and 35 collegiate runners. Participants completed 5 overground running trials with their dominant limb striking a force plate, while outfitted with standardised footwear and 3-dimensional motion capture markers. Results Post hoc comparisons revealed recreational runners had a larger vertical loading rate (194.5 vs. 111.5 BW/s, p < 0.001) and shank angle (6.80 vs. 2.09, p < 0.001) compared with the collegiate runners who demonstrated greater vertical impulse (0.349 vs. 0.233 BWs, p < 0.001), negative impulse (-0.022 vs. -0.013 BWs, p < 0.001), positive impulse (0.024 vs. 0.014 BWs, p < 0.001), and propulsive force (0.390 vs. 0.333 BW, p = 0.002). Adjusted for speed, collegiate runners demonstrated greater total support moment (TSM), plantar flexor moment, knee extensor moment, hip extensor moment, and had greater proportional plantar flexor moment contribution and less knee extensor moment contribution to the TSM compared with recreational runners. Unadjusted for speed, collegiate runners compared with recreational had greater TSM and plantar flexor moment but similar joint contributions to the TSM. Discussion Greater ankle joint contribution may be more efficient and allow for greater capacity to increase speed. Improving plantarflexor function during running provides a strategy to improve running speed among recreational runners. Moreover, differences in joint kinetics and ground reaction force characteristics suggests that recreational and collegiate runners may experience different types of RRI.
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Affiliation(s)
- Ryan J. Evans
- School of Kinesiology, Western University, London ON, Canada
| | - Tyler J. Moffit
- Department of Kinesiology, California State University, Bakersfield, CA, United States
| | - Peter K. Mitchell
- Department of Kinesiology, California State University, Fullerton, CA, United States
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An SK, Jang H, Kim HJ, Na DL, Yoon JH. Linguistic, visuospatial, and kinematic writing characteristics in cognitively impaired patients with beta-amyloid deposition. Front Aging Neurosci 2023; 15:1217746. [PMID: 37753065 PMCID: PMC10518411 DOI: 10.3389/fnagi.2023.1217746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Accepted: 07/26/2023] [Indexed: 09/28/2023] Open
Abstract
Introduction Beta-amyloid (Aβ) deposition, a hallmark of Alzheimer's disease (AD), begins before dementia and is an important factor in mild cognitive impairment (MCI). Aβ deposition is a recognized risk factor for various cognitive impairments and has been reported to affect motor performance as well. This study aimed to identify the linguistic, visuospatial, and kinematic characteristics evident in the writing performance of patients with cognitive impairment (CI) who exhibit Aβ deposition. Methods A total of 31 patients diagnosed with amnestic mild cognitive impairment (aMCI) with Aβ deposition, 26 patients with Alzheimer's-type dementia, and 33 healthy control (HC) participants without deposition were administered tasks involving dictation of 60 regular words, irregular words, and non-words consisting of 1-4 syllables. Responses from all participants were collected and analyzed through digitized writing tests and analysis tools. Results In terms of linguistic aspects, as cognitive decline progressed, performance in the dictation of irregular words decreased, with errors observed in substituting the target grapheme with other graphemes. The aMCI group frequently exhibited corrective aspects involving letter rewriting during the task. In terms of visuospatial aspects, the AD group displayed more errors in grapheme combination compared to the HC group. Lastly, in the kinematic aspects, both the aMCI group and the AD group exhibited slower writing speeds compared to the HC group. Discussion The findings suggest that individuals in the CI group exhibited lower performance in word dictation tasks than those in the HC group, and these results possibly indicate complex cognitive-language-motor deficits resulting from temporal-parietal lobe damage, particularly affecting spelling processing. These results provide valuable clinical insights into understanding linguistic-visuospatial-kinematic aspects that contribute to the early diagnosis of CI with Aβ deposition.
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Affiliation(s)
- Seo Kyung An
- Department of Speech-Language Pathology and Audiology, Hallym University, Chuncheon, Republic of Korea
| | - Hyemin Jang
- Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Hee Jin Kim
- Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Duk L. Na
- Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Ji Hye Yoon
- Division of Speech Pathology and Audiology, Research Institute of Audiology and Speech Pathology, Hallym University, Chuncheon, Republic of Korea
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Parmley J, Jones B, Whitehead S, Rennie G, Hendricks S, Johnston R, Collins N, Bennett T, Weaving D. The speed and acceleration of the ball carrier and tackler into contact during front-on tackles in rugby league. J Sports Sci 2023; 41:1450-1458. [PMID: 37925647 DOI: 10.1080/02640414.2023.2273657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Accepted: 10/14/2023] [Indexed: 11/07/2023]
Abstract
The aim was to use a combination of video analysis and microtechnology (10 Hz global positioning system [GPS]) to quantify and compare the speed and acceleration of ball-carriers and tacklers during the pre-contact phase (contact - 0.5s) of the tackle event during rugby league match-play. Data were collected from 44 professional male rugby league players from two Super League clubs across two competitive matches. Tackle events were coded and subject to three stages of inclusion criteria to identify front-on tackles. 10 Hz GPS data was synchronised with video to extract the speed and acceleration of the ball-carrier and tackler into each front-on tackle (n = 214). Linear mixed effects models (effect size [ES], confidence intervals, p-values) compared differences. Overall, ball-carriers (4.73 ± 1.12 m∙s-1) had greater speed into front-on tackles than tacklers (2.82 ± 1.07 m∙s-1; ES = 1.69). Ball-carriers accelerated (0.67 ± 1.01 m∙s-2) into contact whilst tacklers decelerated (-1.26 ± 1.36 m∙s-2; ES = 1.74). Positional comparisons showed speed was greater during back vs. back (ES = 0.66) and back vs. forward (ES = 0.40) than forward vs. forward tackle events. Findings can be used to inform strategies to improve performance and player welfare.
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Affiliation(s)
- James Parmley
- Carnegie Applied Rugby Research (CARR) Centre, Carnegie School of Sport, Leeds Beckett University, Leeds, UK
| | - Ben Jones
- Carnegie Applied Rugby Research (CARR) Centre, Carnegie School of Sport, Leeds Beckett University, Leeds, UK
- England Performance Unit, Rugby Football League, Leeds, UK
- Premiership Rugby, London, United Kingdom
- School of Science and Technology, University of New England, Armidale, NSW, Australia
- Division of Exercise Science and Sports Medicine, Department of Human Biology, Faculty of Health Sciences, the University of Cape Town and the Sports Science Institute of South Africa, Cape Town, South Africa
| | - Sarah Whitehead
- Carnegie Applied Rugby Research (CARR) Centre, Carnegie School of Sport, Leeds Beckett University, Leeds, UK
| | - Gordon Rennie
- Carnegie Applied Rugby Research (CARR) Centre, Carnegie School of Sport, Leeds Beckett University, Leeds, UK
- Catapult Sports, Leeds, UK
| | - Sharief Hendricks
- Carnegie Applied Rugby Research (CARR) Centre, Carnegie School of Sport, Leeds Beckett University, Leeds, UK
- Division of Exercise Science and Sports Medicine, Department of Human Biology, Faculty of Health Sciences, the University of Cape Town and the Sports Science Institute of South Africa, Cape Town, South Africa
| | - Rich Johnston
- Carnegie Applied Rugby Research (CARR) Centre, Carnegie School of Sport, Leeds Beckett University, Leeds, UK
- School of Behavioural and Health Sciences, Australian Catholic University, Brisbane, Queensland, Australia
- Sports Performance, Recovery, Injury and New Technologies (SPRINT) Research Centre, Australian Catholic University, Brisbane, QLD, Australia
| | - Neil Collins
- Carnegie Applied Rugby Research (CARR) Centre, Carnegie School of Sport, Leeds Beckett University, Leeds, UK
- England Performance Unit, Rugby Football League, Leeds, UK
| | - Thomas Bennett
- Department of Sport, Health and Exercise Science, University of Hull, Hull, UK
- Hull F.C, Hull, UK
| | - Dan Weaving
- Carnegie Applied Rugby Research (CARR) Centre, Carnegie School of Sport, Leeds Beckett University, Leeds, UK
- Applied Sports Science and Exercise Testing Laboratory, The University of Newcastle, Ourimbah, Australia
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Singh U, Connor JD, Leicht AS, Brice SM, Doma K. Acute effects of prior conditioning activity on change of direction performance. A systematic review and meta-analysis. J Sports Sci 2023; 41:1701-1717. [PMID: 38124253 DOI: 10.1080/02640414.2023.2293556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 12/04/2023] [Indexed: 12/23/2023]
Abstract
We performed a systematic review and meta-analysis on the acute effects of prior conditioning activity (CA) on change of direction (COD) performance. Eligible studies, involving healthy participants undergoing acute CA with at least one measure of COD performance, were analysed across diverse databases. A total of 34 studies were included for systematic review with 19 studies included for the meta-analysis. The intervention condition resulted in significantly faster (Z = 4.39; standard mean difference [SMD] = 0.49; p < 0.05) COD performance compared with the control condition. Both unloaded and light loaded CA resulted in significantly greater (SMD = 0.58-0.59) COD performance compared to the control condition. Moreover, heavy loaded CA demonstrated a significant but small (SMD = 0.24) improvement in COD performance compared to the control condition. Age and study design had no effect on the overall meta-analysis outcomes. Both males and females exhibited similar moderate effects with CA but only males demonstrated significantly greater COD performance compared to control conditions. Our findings indicate that a range of CA protocols can acutely improve COD performance with unloaded and light-loaded CA resulting in the greatest performance enhancements. These findings will assist practitioners with the design and implementation of appropriate acute CA to improve COD performance.
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Affiliation(s)
- Utkarsh Singh
- Sport and Exercise Science, College of Healthcare Sciences, James Cook University, Townsville, Australia
| | - Jonathan D Connor
- Sport and Exercise Science, College of Healthcare Sciences, James Cook University, Townsville, Australia
| | - Anthony S Leicht
- Sport and Exercise Science, College of Healthcare Sciences, James Cook University, Townsville, Australia
- Australian Institute of Tropical Health & Medicine, James Cook University, Townsville, Queensland, Australia
| | - Sara M Brice
- Physical Sciences, College of Science and Engineering, James Cook University, Townsville, Australia
| | - Kenji Doma
- Sport and Exercise Science, College of Healthcare Sciences, James Cook University, Townsville, Australia
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Flórez Gil E, Rodríguez-Fernández A, Vaquera A, Suárez-Iglesias D, Scanlan AT. The discriminative, criterion, and longitudinal validity of small-sided games to assess physical fitness in female basketball players. J Sports Sci 2023; 41:1498-1506. [PMID: 37947079 DOI: 10.1080/02640414.2023.2279819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Accepted: 10/29/2023] [Indexed: 11/12/2023]
Abstract
The validity of small-sided games (SSG) for assessing physical fitness was evaluated in 21 female basketball players from senior (n = 8), under-18 years (n = 6), and under-16 years (n = 7) age categories. Players underwent fitness testing (countermovement jump [CMJ], agility T-test, repeated-sprint ability (RSA) test, and Yo-Yo Intermittent Recovery Test [YYIRT1]) and 3vs3-SSG before and after a 6-week preseason. Player demands were monitored during SSG using local positioning system and heart rate technology. Regarding discriminative validity, senior players produced better CMJ, agility T-test, and YYIRT1 performance (p < 0.05, effect size [ES] = 1.72-2.25), and more distance and PlayerLoad (p < 0.05, ES = 1.53-2.47) during SSG than under-18 players following the preseason. For criterion validity, total distance and distance completing high-intensity decelerations during SSG were significantly (p < 0.05) correlated with CMJ (r = 0.44-0.66), YYIRT1 (r = 0.43-0.63), agility T-test (total distance only, r=-0.51), and RSA test performance (r=-0.49 to -0.52) among all players combined following the preseason. Regarding longitudinal validity, significantly better agility T-test and YYIRT1 performance (p ≤ 0.001, ES = 0.88-0.93) alongside lower heart rate during SSG (p = 0.001, ES = 0.88) were evident for all players combined following the preseason. These results partially support the validity of 3vs3-SSG to assess physical fitness in female basketball players.
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Affiliation(s)
| | - Alejandro Rodríguez-Fernández
- Faculty of Physical Activity and Sports Sciences, VALFIS Research Group, Institute of Biomedicine (IBIOMED), Universidad de León, León, Spain
| | - Alejandro Vaquera
- Faculty of Physical Activity and Sports Sciences, VALFIS Research Group, Institute of Biomedicine (IBIOMED), Universidad de León, León, Spain
- School of Sport and Exercise Science, University of Worcester, Worcester, UK
| | - David Suárez-Iglesias
- Faculty of Physical Activity and Sports Sciences, VALFIS Research Group, Institute of Biomedicine (IBIOMED), Universidad de León, León, Spain
| | - Aaron T Scanlan
- School of Health, Medical, and Applied Sciences, Central Queensland University, Rockhampton, Queensland, Australia
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Heuer H, Wühr P. The Impact of Speed-Accuracy Instructions on Spatial Congruency Effects. J Cogn 2023; 6:49. [PMID: 37636012 PMCID: PMC10453986 DOI: 10.5334/joc.318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Accepted: 08/13/2023] [Indexed: 08/29/2023] Open
Abstract
In many tasks humans can trade speed against accuracy. This variation of strategy has different consequences for congruency effects in different conflict tasks. Recently, Mittelstädt et al. (2022) suggested that these differences are related to the dynamics of congruency effects as assessed by delta plots. With increasing delta plots in the Eriksen flanker task congruency effects were larger under accuracy set, and with decreasing delta plots in the Simon task they were smaller. Here we tested the hypothesis for a single task, making use of the observation that for the Simon task delta plots decline when the irrelevant feature is presented first, but increase when the relevant feature leads. The differences between congruency effects under speed and accuracy instructions confirmed the hypothesized relation to the slope of delta plots. In fact, for similar delta plots in the compared speed-accuracy conditions, the relation should be a straightforward consequence of the shorter and longer reaction times with speed and accuracy set, respectively. However, when relevant and irrelevant features were presented simultaneously, congruency effects were stronger under speed set at all reaction times. For this condition, a supplementary model-based analysis with an extended leaky, competing accumulator model suggested a stronger and longer-lasting influence of the irrelevant stimulus feature. The congruency effects for reaction times were accompanied by congruency effects for error rates when delta plots were decreasing, but not when they were increasing.
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Affiliation(s)
- Herbert Heuer
- Leibniz Research Center for Working Environment and Human Factors (IfADo), DE
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Yu E, Lowe J, Millon J, Tran K, Coffey C. Change in grip strength, hang time, and knot tying speed after 24 hours of endurance rock climbing. Front Sports Act Living 2023; 5:1224581. [PMID: 37601165 PMCID: PMC10433161 DOI: 10.3389/fspor.2023.1224581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Accepted: 07/13/2023] [Indexed: 08/22/2023] Open
Abstract
Background Non-professional climbers are increasingly attempting long routes in a single day. Many suffer injury or rely on search and rescue teams when they become too fatigued to finish. Predicting fatigue is difficult, and existing studies have only studied climbers over durations less than an hour, while many outdoor multipitch climbs require more than an hour of climbing. Objectives To determine how strength, endurance, and dexterity reflect fatigue after 24 h of continuous climbing. Methods Volunteer competitors completed measurements of grip strength, static hang time to failure, and time to tie a figure-eight follow-through knot. Measurements were taken during the registration period before the competition and again within an hour after the competition ended. Measurements were compared using the paired t-test. Subgroup analysis was applied to competitors by division. Linear regression was applied to determine the relationship between vertical feet climbed and the number of routes climbed during the competition on each metric. Results Thirty-six total climbers (average age 29.4 years old) completed pre- and post-competition measurements. After 24 h of climbing (n = 36), mean grip strength decreased by 14.3-15 lbs or 14.7%-15.1% (p < 0.001) and static hang time decreased by 54.2 s or 71.2% (p < 0.001). There was no significant change in time to tie a figure-eight-follow-through knot. Grip strength and hang time decreases were significant in climbers with outdoor redpoints of 5.10a and above. Hang time decreased by 5.4 s per 1,000 vertical feet climbed (p = 0.044). Conclusion Climbers can expect to experience a 14.7%-15.1% decrease in grip strength and 71.2% decrease in static hang time after 24 h of continuous climbing. These changes may make it difficult to climb consistently over a long objective, and climbers can use these measures at home to train for longer climbing routes. Future studies on shorter climbing intervals can help determine rates of decline in performance measures.
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Affiliation(s)
- Elaine Yu
- Department of Emergency Medicine, University of California San Diego, San Diego, CA, United States
| | - Jacques Lowe
- Carle Illinois College of Medicine, University of Illinois Urbana-Champagne, Urbana, IL, United States
| | - Jasmin Millon
- American University of the Caribbean School of Medicine, Cupecoy, Sint Maarten
| | - Kristi Tran
- Department of Emergency Medicine, State University of New York Downstate, Brooklyn, NY, United States
| | - Christanne Coffey
- Department of Emergency Medicine, University of California San Diego, San Diego, CA, United States
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Soleymani H, Cowan R. Relationship between rolling resistance, preferred speed, and manual wheelchair propulsion mechanics in non-disabled adults. Disabil Rehabil Assist Technol 2023:1-12. [PMID: 37493253 DOI: 10.1080/17483107.2023.2239297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
PURPOSE To characterize the relationship among rolling resistance (RR), preferred speed, and propulsion mechanics. METHODS N = 11 non-disabled individuals (mean (SD)); Age 24 years (2), BMI 23.8 kg/m2 (4.3) completed a submaximal graded wheelchair exercise test (GXTsubmax, fixed speed, terminated at Rating of Perceived Effort (RPE)=8 (0-10 scale)) and a single-blind, within-subject repeated measures wheelchair propulsion experiment (RME). RR at RPE = 10 (estimated maximum workload, Maxestimated) was estimated from the GXTsubmax RPE-RR relationship. RME consisted of N = 19 1-minute trials (self-selected speed) each followed by 2-minutes rest. The trials included N = 16 unique RR between 25-100% of Maxestimated. Averages of all pushes in N = 16 unique 1-minute trials were computed for average RR (N), speed (m/s), peak force (Fpeak (N)), force rate of rise (Fror (N/s)), push frequency (PF (pushes/min)), and push length (PL (deg)). RESULTS Repeated measures correlation assessed relationships among outcome variables (α = 0.05). RR was associated with decreased speed (r=-0.81, p < 0.001), increased Fpeak (r = 0.92), Fror (r = 0.26), and PL (r = 0.32) (all p > 0.001), and unrelated to PF (r = 0.02, p = 0.848). Increased speed was associated with increased Fror (r = 0.23, p = 0.003) and PF (r = 0.27, p < 0.001) and decreased Fpeak (r=-0.66, p < 0.001) and PL (r=-0.25, p < 0.001). CONCLUSION Increasing RR increases Fpeak despite reducing self-selected speed. RR and speed were strongly and moderately related to Fpeak, respectively, but weakly related to other propulsion mechanics. These results suggest that reducing user-system RR may confer dual benefits of improved mobility and decreased upper extremity loading. Further testing among wheelchair users is required. Clinical trial registration number: NCT04987177.
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Affiliation(s)
- Hunter Soleymani
- University of Alabama at Birmingham Heersink School of Medicine, Birmingham, AL, USA
| | - Rachel Cowan
- Department of Physical Medicine and Rehabilitation, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, AL, USA
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Bartolomeu RF, Sampaio T, Oliveira JP, Barbosa TM, Morais JE. Association between the Upper Quarter Dynamic Balance, Anthropometrics, Kinematics, and Swimming Speed. J Funct Morphol Kinesiol 2023; 8:96. [PMID: 37489309 PMCID: PMC10366733 DOI: 10.3390/jfmk8030096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 06/22/2023] [Accepted: 07/05/2023] [Indexed: 07/26/2023] Open
Abstract
Besides recurrently assessed water-based parameters, there are also some individual characteristics that affect swimming performance that are not water related. In the past few years, dynamic balance has been associated with land sports performance. Conversely, evidence on this topic in swimming is scarce. The purpose of this study was to assess the association between on-land dynamic balance and swimming performance. Sixteen young adults and recreational swimmers were recruited for the present study (8 males 20.8 ± 2.0 years, and 8 females 20.1 ± 1.9 years). A set of anthropometric features were measured. The upper quarter Y-balance test was selected as a dynamic balance outcome, and swimming speed as the swimming performance indicator. The results showed a moderate and positive correlation between dynamic balance and swimming performance (p < 0.05). Speed fluctuation was highly and negatively related to swimming speed (p < 0.001), i.e., swimmers who had higher scores in the dynamic balance were more likely to deliver better performances. This suggests that in recreational swimmers, the stability and mobility of the upper extremity had a greater influence on swimming performance. Therefore, swimming instructors are advised to include dynamic balance exercises in their land-based training sessions to improve their swimmers' performance.
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Affiliation(s)
- Raul F Bartolomeu
- Department of Sports Sciences, Polytechnic of Guarda, 6300-559 Guarda, Portugal
- Department of Sport Sciences and Physical Education, Instituto Politécnico de Bragança, 5300-252 Bragança, Portugal
- Research Center in Sports Sciences, Health and Human Development (CIDESD), 5000-801 Vila Real, Portugal
| | - Tatiana Sampaio
- Department of Sport Sciences and Physical Education, Instituto Politécnico de Bragança, 5300-252 Bragança, Portugal
- Research Center in Sports Sciences, Health and Human Development (CIDESD), 5000-801 Vila Real, Portugal
| | - João P Oliveira
- Research Center in Sports Sciences, Health and Human Development (CIDESD), 5000-801 Vila Real, Portugal
- Department of Sports Sciences, University of Beira Interior, 6201-001 Covilhã, Portugal
| | - Tiago M Barbosa
- Department of Sport Sciences and Physical Education, Instituto Politécnico de Bragança, 5300-252 Bragança, Portugal
- Research Center in Sports Sciences, Health and Human Development (CIDESD), 5000-801 Vila Real, Portugal
| | - Jorge E Morais
- Department of Sport Sciences and Physical Education, Instituto Politécnico de Bragança, 5300-252 Bragança, Portugal
- Research Center in Sports Sciences, Health and Human Development (CIDESD), 5000-801 Vila Real, Portugal
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Duncan MJ, AlShabeb A, Fitton Davies K, Alshahrani N, Almasoud Y. A 6-Week Badminton-Based Movement Intervention Enhances Fundamental Movement Skills and Physical Fitness in Saudi Boys and Girls. Sports (Basel) 2023; 11:132. [PMID: 37505619 PMCID: PMC10385236 DOI: 10.3390/sports11070132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 06/05/2023] [Accepted: 07/05/2023] [Indexed: 07/29/2023] Open
Abstract
This study examined the short (pre-post) and longer-term (post to 10 weeks post) effects of the Badminton World Federation (BWF) Shuttle Time program on fundamental movement skills (FMS) and physical fitness in Saudi boys and girls. Seventy-six children aged 9-11 years (44 boys, 32 girls; mean ± SD = 10.2 ± 0.9 years) undertook twice weekly Shuttle Time sessions for 6 weeks. Pre, post, and 10 weeks post, FMS was measured using the test of gross motor development 3 and physical fitness was measured via 10 m sprint speed, standing long jump, seated medicine ball throw, and a 6 min walk test (6MWT). There were significant improvements in FMS from pre to post (p = 0.0001) and post to 10-weeks post (p = 0.0001) for both boys and girls. Girls demonstrated a significantly greater magnitude of change in FMS. For 10 m sprint time, seated medicine ball throw, standing long jump, and 6MWT performance, both boys and girls significantly improved from pre-10 weeks post (all p = 0.001). The magnitude of change was greater pre to 10-weeks post for girls for the seated medicine ball throw, but was greater for boys for the standing long jump and 6MWT. In terms of practical applications, the BWF Shuttle Time program is feasible for administration in the Saudi context and is beneficial in developing FMS and fitness for Saudi children aged 8-12 years.
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Affiliation(s)
- Michael J Duncan
- Centre for Sport, Exercise and Life Sciences, Coventry University, Coventry CV1 5FB, UK
| | - Abdulrahman AlShabeb
- Department of English, College of Languages and Translation, Imam Mohammed Ibn Saud Islamic University (IMSIU), Riyadh 11564, Saudi Arabia
| | - Katie Fitton Davies
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool L3 2AJ, UK
| | - Nadia Alshahrani
- Technical Programs, Applied College, Princess Nourah bint Abdulrahman University (PNU), Riyadh 11564, Saudi Arabia
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Taylor JD, Corbitt A, Mathis RA. The Effects of High-Load Slow-Velocity Resistance Exercise Training in Athletes With Tendinopathy: A Critically Appraised Topic. J Sport Rehabil 2023:1-7. [PMID: 37414406 DOI: 10.1123/jsr.2023-0029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 03/31/2023] [Accepted: 05/09/2023] [Indexed: 07/08/2023]
Abstract
CLINICAL SCENARIO Tendinopathy is a musculoskeletal pathological condition experienced by athletes that can result in pain, impaired muscle performance, and loss of physical function and can hinder return to sports. Various types of resistance exercise training are effective for treating tendinopathy, including isometric, concentric, eccentric, and high-load slow-velocity resistance exercise. CLINICAL QUESTION What are the effects of high-load slow-velocity resistance exercise training, compared with other forms of resistance exercise, on tendon morphology and patient-reported outcomes in athletes with tendinopathy? SUMMARY OF KEY FINDINGS The findings of 4 randomized clinical trials were included. One study compared high-load slow-velocity resistance exercise with moderate-load slow-velocity resistance exercise. Two studies investigated the effects of high-load slow-velocity resistance exercise versus eccentric resistance exercise. The fourth study compared high-load slow-velocity resistance exercise with inertia-based resistance exercise. In all of the studies, high-load slow-velocity resistance exercise was as effective as the other forms of resistance exercise for improving patient-reported outcomes and pain. Three studies found no significant differences in changes in tendon morphology between patients who received high-load slow-velocity resistance exercise versus those who received the other forms of resistance exercise. One study showed that high-load slow-velocity resistance exercise was more effective than eccentric exercise for improving tendon morphology outcomes. CLINICAL BOTTOM LINE Current evidence supports the use of high-load slow-velocity resistance exercise as a treatment option for patellar and Achilles tendinopathy in athletes. STRENGTH OF RECOMMENDATION Results from level 2 studies suggest grade B evidence in support of high-load slow-velocity resistance exercise for treating athletes with tendinopathy.
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Affiliation(s)
- J David Taylor
- Department of Physical Therapy, University of Central Arkansas, Conway, AR,USA
| | - Annemieke Corbitt
- Department of Physical Therapy, University of Central Arkansas, Conway, AR,USA
| | - Ruth Ann Mathis
- Physical Therapy Program, Harding University, Searcy, AR,USA
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Stenroth L, Vartiainen P, Karjalainen PA. Force-velocity profiling in ice hockey skating: reliability and validity of a simple, low-cost field method. Sports Biomech 2023; 22:874-889. [PMID: 32546104 DOI: 10.1080/14763141.2020.1770321] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Accepted: 05/12/2020] [Indexed: 10/24/2022]
Abstract
In recent years, a simple method for force-velocity (F-v) profiling, based on split times, has emerged as a potential tool to examine mechanical variables underlying running sprint performance in field conditions. In this study, the reliability and concurrent validity of F-v profiling based on split times were examined when used for ice hockey skating. It was also tested how a modification of the method, in which the start instant of the sprint is estimated based on optimisation (time shift method), affects the reliability and validity of the method. Both intra- and inter-rater reliability were markedly improved when using the time shift method (approximately 50% decrease in the standard error of measurement). Moreover, the results calculated using the time shift method highly correlated (r > 0.83 for all variables) with the results calculated from a continuously tracked movement of the athlete, which was considered here as the reference method. This study shows that a modification to the previously published simple method for F-v profiling improves intra- and inter-rater reliability of the method in ice hockey skating. The time shift method tested here can be used as a reliable tool to test a player's physical performance characteristic underlying sprint performance in ice hockey skating.
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Affiliation(s)
- Lauri Stenroth
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
| | - Paavo Vartiainen
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
| | - Pasi A Karjalainen
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
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Doma K, Connor JD, Nakamura FY, Leicht AS. Intra-Session Reliability of Sprint Performance on a Non-Motorised Treadmill for Healthy Active Males and Females. J Hum Kinet 2023; 87:163-171. [PMID: 37559768 PMCID: PMC10407314 DOI: 10.5114/jhk/163180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2022] [Accepted: 05/29/2022] [Indexed: 08/11/2023] Open
Abstract
This study examined the intra-session reliability of sprint performance on a non-motorized treadmill amongst healthy, active male and female adults. One hundred and twenty participants (males n = 77; females n = 45) completed two familiarization sessions, followed by a third session that consisted of three trials (T1, T2, T3) of maximal sprints (4-s), interspersed by three minutes of recovery. Combining males and females exhibited moderate-to-excellent test-retest reliability (intra-class correlation coefficient, ICC), minimal measurement error (coefficient of variation, CV) and trivial differences between trials (effect size, ES) for speed, power, total work and acceleration (ICC = 0.82-0.98, CV = 1.31-8.45%, ES = 0.01-0.22). The measurement error was improved between comparisons of T1 vs. T2 (CV = 1.62-8.45%, ES = 0.12-0.22) to T2 vs. T3 (CV = 1.31-6.56%, ES = 0.01-0.07) and better for females (CV = 1.26-7.94%, ES = 0.001-0.26) than males (CV = 1.33-8.53%, ES = 0.06-0.31). The current study demonstrated moderate-to-excellent reliability and good-moderate measurement error during a 4-s sprint on a non-motorized treadmill. However, sex had a substantial impact with females exhibiting better values. Practitioners should employ at least two separate trials within a session, in addition to multiple familiarization sessions, to achieve reliable non-motorized treadmill sprint performances.
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Affiliation(s)
- Kenji Doma
- Sport and Exercise Science, James Cook University, Townsville, Queensland, Australia
| | - Jonathan D. Connor
- Sport and Exercise Science, James Cook University, Townsville, Queensland, Australia
| | - Fabio Y. Nakamura
- Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), University of Maia (ISMAI), Maia, Portugal
| | - Anthony S. Leicht
- Sport and Exercise Science, James Cook University, Townsville, Queensland, Australia
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Loturco I, Pereira LA, Freitas TT, Moura TBMA, Mercer VP, Fernandes V, Moura NSA, Moura NA, Zając A, Bishop C. Plyometric Training Practices of Brazilian Olympic Sprint and Jump Coaches: Toward a Deeper Understanding of Their Choices and Insights. J Hum Kinet 2023; 87:131-150. [PMID: 37559773 PMCID: PMC10407309 DOI: 10.5114/jhk/169167] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 06/12/2023] [Indexed: 08/11/2023] Open
Abstract
Plyometric training is extensively used by coaches to enhance neuromuscular performance in a wide variety of sports. Due to the high demands of sprint speed and power output in elite sprinters and jumpers, sprint and jump coaches are likely to have great knowledge on this topic. Undoubtedly, this expertise is even more pronounced for Olympic coaches, who work with some of the fastest and most powerful athletes in the world, and who are required to continually maintain these athletes at optimal performance levels. Describing and discussing the practices commonly adopted by these coaches in detail and extrapolating this experience to other sport coaching contexts and disciplines may be extremely relevant. The current article presents, explores, and illustrates the plyometric training practices of Brazilian Olympic sprint and jump coaches, with a special focus on training programming and exercise selection.
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Affiliation(s)
- Irineu Loturco
- NAR—Nucleus of High Performance in Sport, São Paulo, Brazil
- Department of Human Movement Sciences, Federal University of São Paulo, São Paulo, Brazil
- University of South Wales, Pontypridd, Wales, United Kingdom
| | - Lucas A. Pereira
- NAR—Nucleus of High Performance in Sport, São Paulo, Brazil
- Department of Human Movement Sciences, Federal University of São Paulo, São Paulo, Brazil
| | - Tomás T. Freitas
- NAR—Nucleus of High Performance in Sport, São Paulo, Brazil
- Department of Human Movement Sciences, Federal University of São Paulo, São Paulo, Brazil
- UCAM Research Center for High Performance Sport, UCAM Universidad Católica de Murcia, Murcia, Spain
- Facultad de Deporte, UCAM Universidad Católica de Murcia, Murcia, Spain
| | | | | | | | | | - Nélio A. Moura
- Pinheiros Sport Club, São Paulo, Brazil
- Chinese Athletics Association, Beijing, China
| | - Adam Zając
- Institute of Sport Sciences, The Jerzy Kukuczka Academy of Physical Education in Katowice, Katowice, Poland
| | - Chris Bishop
- London Sport Institute, Middlesex University, London, United Kingdom
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Ashida H, Kitaoka A. The zooming- speed illusion: A meta illusion? Iperception 2023; 14:20416695231187800. [PMID: 37745725 PMCID: PMC10515532 DOI: 10.1177/20416695231187800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 06/20/2023] [Indexed: 09/26/2023] Open
Abstract
A movie taken from the front window of a running train, with zooming in and out, has been popularly acknowledged as a perceptual illusion such that the train motion is perceived as much slower when zoomed in. This is, however, not a real illusion because the image speed varies as a function of the focal length of the lens. This could be a meta-illusion, that is, an illusory sense of illusion, that might reflect a lack of understanding of how zooming changes the geometrical structure of the image.
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Nikolaidis PT, Son’kin VD. Sports Physiology in Adolescent Track-and-Field Athletes: A Narrative Review. Open Access J Sports Med 2023; 14:59-68. [PMID: 37404686 PMCID: PMC10317547 DOI: 10.2147/oajsm.s417612] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 06/27/2023] [Indexed: 07/06/2023] Open
Abstract
The present study aimed to review the physiological aspects of adolescent track-and-field (TAF) athletes. A search of Scopus on 27/12/2022 using the syntax ABS (track-and-field) AND ABS (children) OR ABS (adolescent) showed 121 documents, and 45 were considered for further analysis. In addition, handsearching was conducted to identify Russian literature missing in Scopus. Differences were shown in performance characteristics among disciplines, especially between throwers and the other athletes. The sex difference in performance (ie, a better performance in boys than in girls) started in early adolescence. A relative age effect was more pronounced in athletes under 13 years old. Despite the wide use of nutritional supplements, an insufficient intake of vitamins has been found. The age of training onset and body weight were identified as risk factors for problems with menarche. The inclusion of track-and-field training programs in physical education was beneficial for health and physical fitness. The need to collaborate closely with parents and coaches was identified, especially, regarding education in topics such as the age of training onset, relative age effect, and doping. In conclusion, the existence of many disciplines with different anthropometric and physiological characteristics highlighted the need for a discipline-specific approach.
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Affiliation(s)
| | - Valentine D Son’kin
- Russian State University of Physical Education, Sport, Youth and Tourism (SCOLIPE), Moscow, Russia
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Doyle EW, Doyle TLA, Bonacci J, Beach AJ, Fuller JT. Cumulative patellofemoral force and stress are lower during faster running compared to slower running in recreational runners. Sports Biomech 2023:1-13. [PMID: 37364918 DOI: 10.1080/14763141.2023.2226111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 06/12/2023] [Indexed: 06/28/2023]
Abstract
Management strategies for patellofemoral pain often involve modifying running distance or speed. However, the optimal modification strategy to manage patellofemoral joint (PFJ) force and stress accumulated during running warrants further investigation. This study investigated the effect of running speed on peak and cumulative PFJ force and stress in recreational runners. Twenty recreational runners ran on an instrumented treadmill at four speeds (2.5-4.2 m/s). A musculoskeletal model derived peak and cumulative (per 1 km of continuous running) PFJ force and stress for each speed. Cumulative PFJ force and stress decreased with faster speeds (9.3-33.6% reduction for 3.1-4.2 m/s vs. 2.5 m/s). Peak PFJ force and stress significantly increased with faster speeds (9.3-35.6% increase for 3.1-4.2 m/s vs. 2.5 m/s). The largest cumulative PFJ kinetics reductions occurred when speeds increased from 2.5 to 3.1 m/s (13.7-14.2%). Running at faster speeds increases the magnitude of peak PFJ kinetics but conversely results in less accumulated force over a set distance. Selecting moderate running speeds (~3.1 m/s) with reduced training duration or an interval-based approach may be more effective for managing cumulative PFJ kinetics compared to running at slow speeds.
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Affiliation(s)
- Eoin W Doyle
- Faculty of Medicine, Health, and Human Sciences, Macquarie University, Sydney, New South Wales, Australia
- Biomechanics, Physical Performance, and Exercise Research Group, Macquarie University, Sydney, New South Wales, Australia
| | - Tim L A Doyle
- Faculty of Medicine, Health, and Human Sciences, Macquarie University, Sydney, New South Wales, Australia
- Biomechanics, Physical Performance, and Exercise Research Group, Macquarie University, Sydney, New South Wales, Australia
| | - Jason Bonacci
- Centre for Sports Research, School of Exercise and Nutrition Sciences, Deakin University, Burwood, Victoria, Australia
| | - Aaron J Beach
- Faculty of Medicine, Health, and Human Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Joel T Fuller
- Faculty of Medicine, Health, and Human Sciences, Macquarie University, Sydney, New South Wales, Australia
- Biomechanics, Physical Performance, and Exercise Research Group, Macquarie University, Sydney, New South Wales, Australia
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Faria R, Vicente A, Silva J. Racing Performance of the Quarter Horse: Genetic Parameters, Trends and Correlation for Earnings, Best Time and Time Class. Animals (Basel) 2023; 13:2019. [PMID: 37370529 DOI: 10.3390/ani13122019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2023] [Revised: 06/11/2023] [Accepted: 06/15/2023] [Indexed: 06/29/2023] Open
Abstract
The aim of this study was to evaluate the sprint racing performance of Quarter Horses in Brazil. Estimating genetic parameters, trends and correlations were obtained by single- and two-trait analyses using Bayesian inference (earnings to 2 years of equestrian age, best time and time class at distances of 301 m and 402 m). The data comprised a period of 38 equestrian years (1978 to 2015) with 23,482 sprint race records from 5861 animals. The heritability estimates were of low to moderate magnitude, ranging from 0.10 to 0.37 (single-trait) and from 0.15 to 0.41 (two-traits), and the repeatability was 0.31 to 0.46. The additive, residual and phenotypic correlations between earnings to 2 years of equestrian age and the other traits (best time and time class in distances 301 m and 402 m) were high (-0.95, -0.96, 0.69 and 0.92), low (-0.29, -0.37, 0.26 and 0.27) and moderate (-0.41, -0.47, 0.37 and 0.47), respectively. There is a positive genetic trend for all traits considered. However, evaluation of the last 10 equestrian years (2006 to 2015) showed negative trends (genetic loss) and trends close to zero (genetic stagnation). The design of breeding programs using the earnings trait in conjunction with other racing performance traits can enhance changes in the genetic gains as a whole in speed-racing Quarter Horses. These findings suggest that the traits studied should be included in breeding selection programs for racing Quarter Horses.
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Affiliation(s)
- Ricardo Faria
- Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista (Unesp), Jaboticabal 14884-900, SP, Brazil
- Hi-Tech Equine (HT Equine, Unipessoal LDA), 7330-313 Marvão, Portugal
| | - António Vicente
- Escola Superior Agrária de Santarém (ESAS), Instituto Politécnico de Santarém, 2001-904 Santarém, Portugal
- CIISA-Centre for Interdisciplinary Research in Animal Health, Faculty of Veterinary Medicine, University of Lisbon, 1300-477 Lisboa, Portugal
- AL4AnimalS-Associate Laboratory for Animal and Veterinary Sciences, 1300-477 Lisboa, Portugal
- CIEQV-Life Quality Research Centre, Instituto Politécnico de Santarém, 2001-904 Santarém, Portugal
| | - Josineudson Silva
- Faculdade de Medicina Veterinária e Zootecnia, Universidade Estadual Paulista (Unesp), Botucatu 18618-307, SP, Brazil
- National Council for Science and Technological Development, Brasilia 71605-001, DF, Brazil
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Andrade MT, Nunes‐Leite MMS, Bruzzi RS, Souza CH, Uendeles‐Pinto JP, Prado LS, Soares DD, Gonçalves DAP, Coimbra CC, Wanner SP. Predicting the body core temperature of recreational athletes at the end of a 10 km self-paced run under environmental heat stress. Exp Physiol 2023; 108:852-864. [PMID: 37018484 PMCID: PMC10988464 DOI: 10.1113/ep091017] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 03/14/2023] [Indexed: 04/07/2023]
Abstract
NEW FINDINGS What is the central question of this study? The aim was to identify the factors predicting the body core temperature of athletes at the end of a 10 km self-paced run in a hot environment. What is the main finding and its importance? Hyperthermia in athletes subjected to self-paced running depends on several factors, highlighting the integrated control of core temperature during exercise under environmental heat stress. Five of the seven variables that significantly predicted core temperature are not invasive and, therefore, practical for use outside the laboratory environment: heart rate, sweat rate, wet-bulb globe temperature, running speed and maximal oxygen consumption. ABSTRACT Measurement of body core temperature (Tcore ) is paramount to determining the thermoregulatory strain of athletes. However, standard measurement procedures of Tcore are not practical for extended use outside the laboratory environment. Therefore, determining the factors that predict Tcore during a self-paced run is crucial for creating more effective strategies to minimize the heat-induced impairment of endurance performance and reduce the occurrence of exertional heatstroke. The aim of this study was to identify the factors predicting Tcore values attained at the end of a 10 km time trial (end-Tcore ) under environmental heat stress. Initially, we extracted data obtained from 75 recordings of recreationally trained men and women. Next, we ran hierarchical multiple linear regression analyses to understand the predictive power of the following variables: wet-bulb globe temperature, average running speed, initial Tcore , body mass, differences between Tcore and skin temperature (Tskin ), sweat rate, maximal oxygen uptake, heart rate and change in body mass. Our data indicated that Tcore increased continuously during exercise, attaining 39.6 ± 0.5°C (mean ± SD) after 53.9 ± 7.5 min of treadmill running. This end-Tcore value was primarily predicted by heart rate, sweat rate, differences between Tcore and Tskin , wet-bulb globe temperature, initial Tcore , running speed and maximal oxygen uptake, in this order of importance (β power values corresponded to 0.462, -0.395, 0.393, 0.327, 0.277, 0.244 and 0.228, respectively). In conclusion, several factors predict Tcore in athletes subjected to self-paced running under environmental heat stress. Moreover, considering the conditions investigated, heart rate and sweat rate, two practical (non-invasive) variables, have the highest predictive power.
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Affiliation(s)
- Marcelo T. Andrade
- Exercise Physiology Laboratory, School of Physical Education, Physiotherapy and Occupational TherapyUniversidade Federal de Minas GeraisBelo HorizonteMGBrazil
| | - Matheus M. S. Nunes‐Leite
- Exercise Physiology Laboratory, School of Physical Education, Physiotherapy and Occupational TherapyUniversidade Federal de Minas GeraisBelo HorizonteMGBrazil
| | - Rúbio S. Bruzzi
- Exercise Physiology Laboratory, School of Physical Education, Physiotherapy and Occupational TherapyUniversidade Federal de Minas GeraisBelo HorizonteMGBrazil
| | - Carlos H. Souza
- Exercise Physiology Laboratory, School of Physical Education, Physiotherapy and Occupational TherapyUniversidade Federal de Minas GeraisBelo HorizonteMGBrazil
| | - João P. Uendeles‐Pinto
- Exercise Physiology Laboratory, School of Physical Education, Physiotherapy and Occupational TherapyUniversidade Federal de Minas GeraisBelo HorizonteMGBrazil
| | - Luciano S. Prado
- Exercise Physiology Laboratory, School of Physical Education, Physiotherapy and Occupational TherapyUniversidade Federal de Minas GeraisBelo HorizonteMGBrazil
- Sports Training Center, School of Physical Education, Physiotherapy and Occupational TherapyUniversidade Federal de Minas GeraisBelo HorizonteMGBrazil
| | - Danusa D. Soares
- Exercise Physiology Laboratory, School of Physical Education, Physiotherapy and Occupational TherapyUniversidade Federal de Minas GeraisBelo HorizonteMGBrazil
| | - Dawit A. P. Gonçalves
- Exercise Physiology Laboratory, School of Physical Education, Physiotherapy and Occupational TherapyUniversidade Federal de Minas GeraisBelo HorizonteMGBrazil
- Sports Training Center, School of Physical Education, Physiotherapy and Occupational TherapyUniversidade Federal de Minas GeraisBelo HorizonteMGBrazil
| | - Cândido C. Coimbra
- Laboratory of Endocrinology and Metabolism, Institute of Biological SciencesUniversidade Federal de Minas GeraisBelo HorizonteMGBrazil
| | - Samuel P. Wanner
- Exercise Physiology Laboratory, School of Physical Education, Physiotherapy and Occupational TherapyUniversidade Federal de Minas GeraisBelo HorizonteMGBrazil
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Liang Y, Kamiel-Skeete A, Pettitt A, Hiley MJ. Where in a time constrained throwing task is the speed-accuracy trade-off? J Sports Sci 2023:1-6. [PMID: 37255017 DOI: 10.1080/02640414.2023.2220181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Previous research on fielding in cricket and baseball has focused on the technique and speed-accuracy trade-off of the throw in isolation from a typical sequence of fielding actions; approach, gather and throw. The present study aimed to determine whether a speed-accuracy trade-off existed in fielding and where within the above sequence the trade-off occurs. Participants, who were elite cricketers, were required to run to a stationary ball and throw to the centre of a target in order to run-out a virtual batter. High-speed video was used to record the time of approach, time in contact with, and time of flight of the ball. Two-way ANOVAs were used to determine differences in group (gender) and condition (instructions to prioritise speed or accuracy). A speed-accuracy trade-off was found, with both groups being quicker in the approach and spending less time in contact with the ball in the speed condition; however, the horizontal velocity of the throw remained the same in both conditions. It was proposed the drop in accuracy in the speed condition may be associated with less time spent aiming. It was found that instructions triggered a change in throwing technique for 31% of the participants, which requires further investigation.
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Affiliation(s)
- Ying Liang
- Department of Physical Education, Anhui Normal University, Wuhu, China
| | - Aviv Kamiel-Skeete
- School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, UK
| | - Adam Pettitt
- School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, UK
| | - Michael J Hiley
- School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, UK
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50
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Drenowatz C, Ferrari G, Greier K, Chen S, Hinterkörner F. Physical fitness in Austrian elementary school children prior to and post-COVID-19. AIMS Public Health 2023; 10:480-495. [PMID: 37304593 PMCID: PMC10251054 DOI: 10.3934/publichealth.2023034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 05/15/2023] [Accepted: 05/19/2023] [Indexed: 06/13/2023] Open
Abstract
Background With the emergence of the COVID-19 pandemic, many countries implemented policies that included movement restrictions, social distancing and school closures in order to control the spread of the virus. Even though these actions may have been necessary to save lives, there have been some unintended consequences that could affect future public health. Methods The present study uses data from more than 24,500 Austrian elementary school children (51.2% male) that participated in a state-wide fitness evaluation program, which was initiated in the 2016/17 school year. In addition to body weight and height, data on cardiorespiratory endurance, muscular power, speed, agility, flexibility and object control were collected from three cohorts prior to the implementation of movement restrictions (school years: 2016/17, 2017/18, 2018/19) and one cohort in 2022, after the majority of COVID-19 policies had been lifted. Results Body mass index percentiles were significantly higher in children post-COVID-19 (p < 0.01). Further, cardiorespiratory endurance, agility and flexibility were significantly lower post-COVID-19 compared to the years preceding movement restrictions (p ≤ 0.01), while absolute muscular strength was higher in the year 2022 (p < 0.01). Conclusion Given the detrimental effects of COVID-19 policies on physical fitness in children, additional efforts are necessary that include versatile opportunities for physical activity and the promotion of physical fitness in order to modify the observed negative health trajectories and ensure future public health.
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Affiliation(s)
- Clemens Drenowatz
- Division of Sport, Physical Activity and Health, University of Education Upper Austria, 4020 Linz, Austria
| | - Gerson Ferrari
- Escuela de Ciencias de la Actividad Física, el Deporte y la Salud, Universidad de Santiago de Chile (USACH) Santiago 7500618, Chile
| | - Klaus Greier
- Department of Sport Science, University of Innsbruck, 6020 Innsbruck, Austria
- Division of Physical Education, Private Educational College (KPH-ES) 6422 Stams, Austria
| | - Sitong Chen
- Institute for Health and Sport, Victoria University, Melbourne 8001, Australia
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