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Padulo J, Rampichini S, Borrelli M, Buono DM, Doria C, Esposito F. Gait Variability at Different Walking Speeds. J Funct Morphol Kinesiol 2023; 8:158. [PMID: 37987494 PMCID: PMC10660777 DOI: 10.3390/jfmk8040158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 10/31/2023] [Accepted: 11/06/2023] [Indexed: 11/22/2023] Open
Abstract
Gait variability (GV) is a crucial measure of inconsistency of muscular activities or body segmental movements during repeated tasks. Hence, GV might serve as a relevant and sensitive measure to quantify adjustments of walking control. However, it has not been clarified whether GV is associated with walking speed, a clarification needed to exploit effective better bilateral coordination level. For this aim, fourteen male students (age 22.4 ± 2.7 years, body mass 74.9 ± 6.8 kg, and body height 1.78 ± 0.05 m) took part in this study. After three days of walking 1 km each day at a self-selected speed (SS) on asphalt with an Apple Watch S. 7 (AppleTM, Cupertino, CA, USA), the participants were randomly evaluated on a treadmill at three different walking speed intensities for 10 min at each one, SS - 20%/SS + 20%/ SS, with 5 min of passive recovery in-between. Heart rate (HR) was monitored and normalized as %HRmax, while the rate of perceived exertion (RPE) (CR-10 scale) was asked after each trial. Kinematic analysis was performed, assessing the Contact Time (CT), Swing Time (ST), Stride Length (SL), Stride Cycle (SC), and Gait Variability as Phase Coordination Index (PCI). RPE and HR increased as the walking speed increased (p = 0.005 and p = 0.035, respectively). CT and SC decreased as the speed increased (p = 0.0001 and p = 0.013, respectively), while ST remained unchanged (p = 0.277). SL increased with higher walking speed (p = 0.0001). Conversely, PCI was 3.81 ± 0.88% (high variability) at 3.96 ± 0.47 km·h-1, 2.64 ± 0.75% (low variability) at SS (4.94 ± 0.58 km·h-1), and 3.36 ± 1.09% (high variability) at 5.94 ± 0.70 km·h-1 (p = 0.001). These results indicate that while the metabolic demand and kinematics variables change linearly with increasing speed, the most effective GV was observed at SS. Therefore, SS could be a new methodological approach to choose the individual walking speed, normalize the speed intensity, and avoid a gait pattern alteration.
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Affiliation(s)
- Johnny Padulo
- Department of Biomedical Sciences for Health (SCIBIS), Università degli Studi di Milano, 20133 Milan, Italy; (S.R.); (M.B.); (D.M.B.); (C.D.); (F.E.)
| | - Susanna Rampichini
- Department of Biomedical Sciences for Health (SCIBIS), Università degli Studi di Milano, 20133 Milan, Italy; (S.R.); (M.B.); (D.M.B.); (C.D.); (F.E.)
| | - Marta Borrelli
- Department of Biomedical Sciences for Health (SCIBIS), Università degli Studi di Milano, 20133 Milan, Italy; (S.R.); (M.B.); (D.M.B.); (C.D.); (F.E.)
| | - Daniel Maria Buono
- Department of Biomedical Sciences for Health (SCIBIS), Università degli Studi di Milano, 20133 Milan, Italy; (S.R.); (M.B.); (D.M.B.); (C.D.); (F.E.)
| | - Christian Doria
- Department of Biomedical Sciences for Health (SCIBIS), Università degli Studi di Milano, 20133 Milan, Italy; (S.R.); (M.B.); (D.M.B.); (C.D.); (F.E.)
| | - Fabio Esposito
- Department of Biomedical Sciences for Health (SCIBIS), Università degli Studi di Milano, 20133 Milan, Italy; (S.R.); (M.B.); (D.M.B.); (C.D.); (F.E.)
- IRCCS Galeazzi Orthopedic Institute, 20161 Milan, Italy
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Winter L, Bellenger C, Grimshaw P, Crowther RG. Analysis of Movement Variability in Cycling: An Exploratory Study. SENSORS (BASEL, SWITZERLAND) 2023; 23:4972. [PMID: 37430887 DOI: 10.3390/s23104972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 05/12/2023] [Accepted: 05/16/2023] [Indexed: 07/12/2023]
Abstract
The purpose of this study was to determine the test-retest repeatability of Blue Trident inertial measurement units (IMUs) and VICON Nexus kinematic modelling in analysing the Lyapunov Exponent (LyE) during a maximal effort 4000 m cycling bout in different body segments/joints. An additional aim was to determine if changes in the LyE existed across a trial. Twelve novice cyclists completed four sessions of cycling; one was a familiarisation session to determine a bike fit and become better accustomed to the time trial position and pacing of a 4000 m effort. IMUs were attached to the head, thorax, pelvis and left and right shanks to analyse segment accelerations, respectively, and reflective markers were attached to the participant to analyse neck, thorax, pelvis, hip, knee and ankle segment/joint angular kinematics, respectively. Both the IMU and VICON Nexus test-retest repeatability ranged from poor to excellent at the different sites. In each session, the head and thorax IMU acceleration LyE increased across the bout, whilst pelvic and shank acceleration remained consistent. Differences across sessions were evident in VICON Nexus segment/joint angular kinematics, but no consistent trend existed. The improved reliability and the ability to identify a consistent trend in performance, combined with their improved portability and reduced cost, advocate for the use of IMUs in analysing movement variability in cycling. However, additional research is required to determine the applicability of analysing movement variability during cycling.
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Affiliation(s)
- Lachlan Winter
- UniSA Allied Health and Human Performance, University of South Australia, Adelaide, SA 5001, Australia
- Alliance for Research in Exercise, Nutrition & Activity (ARENA), University of South Australia, Adelaide, SA 5001, Australia
| | - Clint Bellenger
- UniSA Allied Health and Human Performance, University of South Australia, Adelaide, SA 5001, Australia
- Alliance for Research in Exercise, Nutrition & Activity (ARENA), University of South Australia, Adelaide, SA 5001, Australia
| | - Paul Grimshaw
- College of Health and Life Sciences, Hamad Bin Khalifa University, Doha P.O. Box 34110, Qatar
- Faculty of Sciences, Engineering and Technology, Computer and Mathematical Sciences, University of Adelaide, Adelaide, SA 5005, Australia
| | - Robert George Crowther
- UniSA Allied Health and Human Performance, University of South Australia, Adelaide, SA 5001, Australia
- Alliance for Research in Exercise, Nutrition & Activity (ARENA), University of South Australia, Adelaide, SA 5001, Australia
- School of Behavioural and Health Sciences, Australian Catholic University, Melbourne, VIC 3065, Australia
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Harsch AK, Kunert A, Koska D, Maiwald C. Quantifying workload using nonlinear dynamical measures of biomechanical parameters during cycling on a roller trainer. PLoS One 2023; 18:e0285408. [PMID: 37159473 PMCID: PMC10168574 DOI: 10.1371/journal.pone.0285408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Accepted: 04/21/2023] [Indexed: 05/11/2023] Open
Abstract
The aim of the present study was to determine the effectiveness of nonlinear parameters in distinguishing individual workload in cycling by using bike-integrated sensor data. The investigation focused on two nonlinear parameters: The ML1, which analyzes the geometric median in phase space, and the maximum Lyapunov exponent as nonlinear measure of local system stability. We investigated two hypothesis: 1. ML1α, derived from kinematic crank data, is as good as ML1F, derived from force crank data, at distinguishing between individual load levels. 2. Increasing load during cycling leads to decreasing local system stability evidenced by linearly increasing maximal Lyapunov exponents generated from kinematic data. A maximal incremental cycling step test was conducted on an ergometer, generating complete datasets from 10 participants in a laboratory setting. Pedaling torque and kinematic data of the crank were recorded. ML1F, ML1α, and Lyapunov parameters (λst, λlt, ιst, ιlt) were calculated for each participant at comparable load levels. The results showed a significant linear increase in ML1α across three individual load levels, with a lower but still large effect compared to ML1F. The contrast analysis also confirmed a linearly increasing trend for λst across three load levels, but this was not confirmed for λlt. However, the intercepts ιst and ιlt of the short- and longterm divergence showed a statistically significant linear increase across the load levels. In summary, nonlinear parameters seem fundamentally suitable to distinguish individual load levels in cycling. It is concluded that higher load during cycling is associated with decreasing local system stability. These findings may aid in developing improved e-bike propulsion algorithms. Further research is needed to determine the impact of factors occurring in field application.
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Affiliation(s)
- Ann-Kathrin Harsch
- Institute of Human Movement Science and Health, Department of Research Methodology and Data Analysis in Biomechanics, Chemnitz Universitiy of Technology, Chemnitz, Germany
| | - Alexander Kunert
- Institute for Mechanical and Plant Engineering ICM, Chemnitz, Germany
| | - Daniel Koska
- Institute of Human Movement Science and Health, Department of Research Methodology and Data Analysis in Biomechanics, Chemnitz Universitiy of Technology, Chemnitz, Germany
| | - Christian Maiwald
- Institute of Human Movement Science and Health, Department of Research Methodology and Data Analysis in Biomechanics, Chemnitz Universitiy of Technology, Chemnitz, Germany
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Padulo J, Ayalon M, Barbieri FA, Di Capua R, Doria C, Ardigò LP, Dello Iacono A. Effects of Gradient and Speed on Uphill Running Gait Variability. Sports Health 2022; 15:67-73. [PMID: 35343321 PMCID: PMC9808836 DOI: 10.1177/19417381211067721] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND The aim of this study was to investigate the effects of gradient and speed on running variability (RV) and local dynamic stability (LDS) during uphill running. HYPOTHESES (1) Both gradient and speed increase metabolic effort, in terms of heart rate (HR) and perceived exertion (CR10), in line with the contemporary literature, and (2) gradient increases RV and impairs LDS. STUDY DESIGN "Crossover" observational design. LEVEL OF EVIDENCE Level 3. METHODS A total of 25 runners completed 10-minute running trials in 3 different conditions and in a randomized order: gradient at 0% (0CON), 2% (2CON), and 2% at isoefficiency speed (2IES). 0CON and 2CON speeds were calculated as the "best 10-km race performance" minus 1 km·h-1, whereas 2IES speed was adjusted to induce the same metabolic expenditure as 0CON. HR and perceived exertion as well as running kinematic variables were collected across all trials and conditions. Running variability was calculated as the standard deviation of the mean stride-to-stride intervals over 100 strides, while LDS was expressed by the Lyapunov exponent (LyE) determined on running cycle time over different running conditions. RESULTS Increases in HR and CR10 were observed between 0CON and 2CON (P < 0.001) and between 2IES and 2CON (P < 0.01). Higher RV was found in 2CON compared with 0CON and 2IES (both P < 0.001). Finally, the largest LyE was observed in 2IES compared with 0CON and 2CON (P = 0.02 and P = 0.01, respectively). CONCLUSION Whereas RV seems to be dependent more on metabolic effort, LDS is affected by gradient to a greater extent. CLINICAL RELEVANCE Running variability could be used to monitor external training load in marathon runners.
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Affiliation(s)
- Johnny Padulo
- Department of Biomedical Sciences for Health,
Università degli Studi di Milano, Milan, Italy
| | - Moshe Ayalon
- The Academic College at Wingate, Netanya,
Israel
| | - Fabio A. Barbieri
- Human Movement Research Laboratory
(MOVI-LAB), Department of Physical Education, São Paulo State University (UNESP), Bauru,
Brazil
| | - Roberto Di Capua
- Department of Physics “E. Pancini,”
University of Naples “Federico II,” Naples, Italy,CNR-SPIN Institute, Naples, Italy
| | - Christian Doria
- Department of Biomedical Sciences for Health,
Università degli Studi di Milano, Milan, Italy
| | - Luca P. Ardigò
- School of Exercise and Sport Science,
Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona,
Verona, Italy,Luca P. Ardigò, PhD, School of
Exercise and Sport Science, Department of Neurosciences, Biomedicine and Movement
Sciences, University of Verona, Via Felice Casorati, 43, Verona, 37131, Italy (
)
| | - Antonio Dello Iacono
- School of Health and Life Sciences,
University of the West of Scotland, Glasgow, UK
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Impact of Centre-of-Mass Acceleration on Perceived Exertion, the Metabolic Equivalent and Heart Rate Reserve in Triathlete Spin Cycling: A Pilot Study. J Hum Kinet 2022; 81:41-52. [PMID: 35291642 PMCID: PMC8884878 DOI: 10.2478/hukin-2022-0004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Abstract
Indoor spin cycling has gained popularity as a training modality for triathletes. Part of its appeal is that it can form a component of a structured periodised training program and provide an alternative to outdoor cycling. Indices of physiological components (i.e., the metabolic equivalent, caloric cost, perceived exertion) and changes in the body position can be inferred by wearable technology such as an accelerometer. This pilot study aimed to investigate the relationship between the rating of perceived exertion, heart rate reserve, and the metabolic equivalent between the whole body centre of mass acceleration using a sacrum mounted triaxial accelerometer during 20 minutes of 6 varied power conditions of indoor spin cycling. Compared with other conditions, cycling at a steady state (>152-205 W) resulted in extremely large effects (> 0.9) in mediolateral acceleration and the rating of perceived exertion (p < 0.0001). The relationship between the body position (aerodynamic to drops) induced significant changes in anteroposterior acceleration magnitude (p < 0.0001), although moving from drops to the aerodynamic position was not significant despite a large increase in heart rate reserve and extremely large effects of perceived exertion. The rating of perceived exertion scale and the metabolic equivalent comparative to the whole body centre of mass acceleration magnitude and power displayed a strong correlation (r = 0.865). An individually determined whole body centre of mass accelerations combined with perceived exertion, the metabolic equivalent and heart rate reserve could potentially contribute to improved indoor triathlete spin cycling performance.
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Uphill walking at iso-efficiency speeds. Biol Sport 2020; 37:247-253. [PMID: 32879546 PMCID: PMC7433331 DOI: 10.5114/biolsport.2020.95635] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 04/06/2020] [Accepted: 05/04/2020] [Indexed: 11/17/2022] Open
Abstract
Uphill walking gait has been extensively studied, but the optimal uphill speed able to enhance the metabolic demand without increasing fatigability has so far received little attention. Therefore, the aim of this study was to assess the metabolic/kinematic demand at constant speed (6 km·h-1 G0 level, G2 2% uphill, G7 7% uphill) and at iso-efficiency speeds (G2IES 5.2 km·h-1 2% uphill and G7IES 3.9 km·h-1 7% uphill). For this aim, physically active women (n:24, Age 33.40 ± 4.97 years, BMI 21.62 ± 2.06 kg/m-2) after an 8-min warm-up were studied on a treadmill for 10' for every walking condition with a 5' rest in between. Average heart rate (AVG-HR), rating of perceived exertion (RPE) and kinematic variables (stance time, swing time, stride length, stride cycle, stride-length variability, stride-cycle variability and internal work) were studied. Modifications in stance time, stride length and stride cycle (p<0.005), and lower internal-work values (p<0.001) occurred in G7IES in comparison to the other conditions. Swing time was significantly modified only in G7IES compared to G0 and G7 (p<0.001 and p<0.005, respectively). Stride-length variability and stride-cycle variability were higher in G7IES compared to the other conditions (p<0.001). G7 induced the highest AVG-HR (p<0.005) and RPE (p<0.001) compared to the other conditions. This study demonstrates that by applying the equation for uphill walking gait, it is possible to maintain a similar metabolic demand and RPE at iso-efficiency speeds during uphill compared to level walking, inducing at the same time a modification of the kinematic parameters of walking gait performed at the same slope condition.
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Shoes and Insoles: The Influence on Motor Tasks Related to Walking Gait Variability and Stability. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17124569. [PMID: 32630373 PMCID: PMC7345333 DOI: 10.3390/ijerph17124569] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 06/22/2020] [Accepted: 06/23/2020] [Indexed: 12/14/2022]
Abstract
The rhythmic control of the lower limb muscles influences the cycle-to-cycle variability during a walking task. The benefits of insoles, commonly used to improve the walking gait, have been little studied. Therefore, the aim of this study was to assess the walking gait variability and stability on different walking conditions (without shoes, WTS, with shoes, WS, with shoes and insoles, WSI) related to brain activity. Twelve participants randomly (WTS/WS/WSI) walked on a treadmill at 4 km/h for 10 min. Kinematic analysis (i.e., footstep and gait variability), brain activation (beta wave signal), rating of perceived exertion (RPE, CR-10 scale), and time domain measures of walking variability were assessed. The maximum Lyapunov exponent (LyE) on the stride cycle period's datasets was also calculated. Stride length and cycle calculated for all walking conditions were 61.59 ± 2.53/63.38 ± 1.43/64.09 ± 2.40 cm and 1.11 ± 0.03/1.14 ± 0.03/1.15 ± 0.04 s (F1,10 = 4.941/p = 0.01, F1,10 = 4.938/p = 0.012) for WTS, WS, WSI, respectively. Beta wave (F1,10 = 564.201/p = 0.0001) was higher in WTS compared to WS and WSI. Analysis of variance's (ANOVA) LyE showed a F1,10 = 3.209/p = 0.056, while post hoc analysis showed a significant effect between WS and WSI with p = 0.023, and nonsignificant effects between WTS and WS/WSI (p = 0.070/0.607), respectively. Small perturbations of the foot can influence the control of gait rhythmicity by increasing the variability in a dissipative deterministic regimen.
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Alhammoud M, Hansen C, Meyer F, Hautier C, Morel B. On-Field Ski Kinematic According to Leg and Discipline in Elite Alpine Skiers. Front Sports Act Living 2020; 2:56. [PMID: 33345047 PMCID: PMC7739787 DOI: 10.3389/fspor.2020.00056] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 04/20/2020] [Indexed: 11/23/2022] Open
Abstract
This study used wireless technology to investigate joint kinematic characteristics of the four alpine skiing disciplines. Knee and hip angles were measured in 20 national team alpine skiers during 253 ski runs under FIS regulation, including: 85 Slalom (SL), 123 Giant Slalom (GS), 29 Super Giant Slalom (SG), and 16 Downhill (DH). Data were analyzed by outside (OL, n = 2,087) and inside leg (IL, n = 2,015). The proportion of concentric and eccentric phases (extension and flexion respectively for the knee extensors) as well as the proportion of the quasi-isometric phase defined between ±20°.s−1 depended on the discipline in interaction with the IL/OL (p < 0.001). The results showed a lower knee quasi-isometric duration on OL in SL (11%) than other disciplines (DH: 38%; SG: 42%; GS: 34%, p < 0.001, d > 1.8), suggesting a highly dynamic style. Quasi-isometric mode was significantly longer on OL than IL in GS (34 vs. 20%, p < 0.001, d = 1.16) and SG (42 vs. 28%, p < 0.001, d = 1.11) but was significantly longer on IL than OL in SL (19 vs. 11%, p < 0.001, d = 0.64). Thus, GS and SG showed similarities, with a significantly faster knee eccentric mean angular velocity on IL compared to OL (GS −58 vs. −54°.s−1, SG −52 vs. −45°.s−1, p < 0.001, d ≥ 0.22) whereas SL showed an opposite pattern (−72 vs. −89°.s−1, p < 0.001, d = 1.10). The quasi-isometric phase was overlooked in previous studies but is crucial to consider. The current data may be used to train the outside and inside leg specificities incorporating discipline-specific contraction modes and exercises.
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Affiliation(s)
- Marine Alhammoud
- French Ski Federation, Annecy, France.,Inter-University Laboratory of Human Movement Biology (EA 7424), University Claude Bernard Lyon 1, Lyon, France.,Surgery Department, Aspetar Orthopaedic and Sports Medicine Hospital, Doha, Qatar
| | - Clint Hansen
- Department of Neurology, Christian-Albrechts-Universität zu Kiel Medizinische Fakultat, Kiel, Germany
| | - Frederic Meyer
- Institute of Sport Science, University of Lausanne, Lausanne, Switzerland
| | - Christophe Hautier
- Inter-University Laboratory of Human Movement Biology (EA 7424), University Claude Bernard Lyon 1, Lyon, France
| | - Baptiste Morel
- Laboratory "Movement, Interactions, Performance" (EA 4334), Le Mans University, Le Mans, France.,Inter-University Laboratory of Human Movement Biology (EA 7424), Savoie Mont Blanc University, Chambéry, France
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Milavic B, Padulo J, Grgantov Z, Milić M, Mannarini S, Manzoni GM, Ardigò LP, Rossi A. Development and factorial validity of the Psychological Skills Inventory for Sports, Youth Version - Short Form: Assessment of the psychometric properties. PLoS One 2019; 14:e0220930. [PMID: 31415637 PMCID: PMC6695110 DOI: 10.1371/journal.pone.0220930] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Accepted: 07/27/2019] [Indexed: 11/19/2022] Open
Abstract
Researchers in sport often try to investigate relations between athletes’ psychological skills and their sports results to predict top athletic achievements or unexpectedly poor performances. The Psychology Skills Inventory for Sports (Youth version), PSIS-Y, was developed to measure psychological characteristics of young athletes–differentiating well more talented and less talented young athletes. Nevertheless, previous studies revealed its inadequate, factorial validity. Thus, the aim of this study was to develop and investigate the psychometric proprieties of a brief version of the PSIS-Y (PSIS-Y-SF) in a sample of young Croatian athletes. Participants (n = 304; 188 females and 116 male) were recruited in clubs/teams all over Croatia and all of them competed in the Croatian Championship in youth (n = 157) and junior category (n = 147). The PSIS-Y-SF was derived by ten expert psychologists with five of them who had past experiences of agonistic sport practice. Psychometric analysis included Confirmatory Factor Analysis (CFA), internal consistency analysis (Raykov’s Maximal Reliability), and correlation between subscales. Moreover, Multivariate Analyses of Variance (MANOVA) was run to test statistical differences between the players’ categories (male youth vs. male junior vs. female youth vs. female junior) in all of the subscales. Results of the CFA suggested the adequateness of the supposed six first-order factor solution for the PSIS-Y-SF. The Maximal Reliability statistics suggest a good internal consistency for all of the subscales and the MANOVA suggested differences between the player’s categories. The PSIS-Y-SF resulted to be a valid and reliable tool for the assessment of sports psychological skills. Findings from the psychometric evaluation of PSIS-Y-SF suggest that this is a useful tool, which may further assist in the measurement and conceptualization of sport psychological skills.
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Affiliation(s)
- Boris Milavic
- Faculty of Kinesiology, University of Split, Split, Croatia
| | - Johnny Padulo
- Faculty of Kinesiology, University of Split, Split, Croatia
- Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, Italy
- Tunisian Research Laboratory Sports Performance Optimization, National Center of Medicine and Science in Sport, Tunis, Tunisia
| | - Zoran Grgantov
- Faculty of Kinesiology, University of Split, Split, Croatia
| | - Mirjana Milić
- Faculty of Kinesiology, University of Split, Split, Croatia
| | - Stefania Mannarini
- Interdepartmental Center for Family Research, University of Padova, Padova, Italy
- Department of Philosophy, Sociology, Education, and Applied Psychology, Section of Applied Psychology, University of Padova, Padova, Italy
| | - Gian Mauro Manzoni
- Faculty of Psychology, eCampus University, Novedrate, Italy
- Psychology Research Laboratory, Ospedale San Giuseppe, IRCCS, Istituto Auxologico Italiano, Verbania, Italy
| | - Luca Paolo Ardigò
- School of Exercise and Sport Science, Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
- * E-mail:
| | - Alessandro Rossi
- Interdepartmental Center for Family Research, University of Padova, Padova, Italy
- Department of Philosophy, Sociology, Education, and Applied Psychology, Section of Applied Psychology, University of Padova, Padova, Italy
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Kunert A, Ott M, Reuter T, Koska D, Maiwald C. Phase space methods for non-linear analysis of pedalling forces in cycling. PLoS One 2019; 14:e0198914. [PMID: 30998746 PMCID: PMC6472725 DOI: 10.1371/journal.pone.0198914] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Accepted: 03/31/2019] [Indexed: 11/29/2022] Open
Abstract
Introduction From the perspective of dynamic systems theory, stability and variability of biological signals are both understood as a functional adaptation to variable environmental conditions. In the present study, we examined whether this theoretical perspective is applicable to the pedalling movement in cycling. Non-linear measures were applied to analyse pedalling forces with varying levels of subjective load. Materials and methods Ten subjects completed a 13-sector virtual terrain profile of 15 km total length on a roller trainer with varying degrees of virtual terrain inclination (resistance). The test was repeated two times with different instructions on how to alter the bikes gearing. During the experiment, pedalling force and heart rate were measured. Force-time curves were sequenced into single cycles, linearly interpolated in the time domain, and z-score normalised. The established time series was transferred into a two-dimensional phase space with limit cycle properties given the applied 25% phase shift. Different representations of the phase space attractor were calculated within each sector and used as non-linear measures assessing pedalling forces. Results and discussion A contrast analysis showed that changes in pedalling load were strongly associated to changes in non-linear phase space attractor variables. For the subjects investigated in this study, this association was stronger than that between heart rate and resistance level. The results indicate systematic changes of the pedalling movement as an adaptive response to an externally determined increase in workload. Future research may utilise the findings from this study to investigate possible relationships between subjective measures of exhaustion, comfort, and discomfort with biomechanic characteristics of the pedalling movement and to evaluate connections with dynamic stability measures.
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Affiliation(s)
- Alexander Kunert
- Department of Medical Engineering and Electronics, ICM - Institute for Mechanical and Industrial Engineering, Chemnitz, Germany
- * E-mail:
| | - Marcel Ott
- Department of Medical Engineering and Electronics, ICM - Institute for Mechanical and Industrial Engineering, Chemnitz, Germany
| | - Thomas Reuter
- Department of Medical Engineering and Electronics, ICM - Institute for Mechanical and Industrial Engineering, Chemnitz, Germany
| | - Daniel Koska
- Department of Human Movement Science and Health, Chemnitz University of Technology, Chemnitz, Germany
| | - Christian Maiwald
- Department of Human Movement Science and Health, Chemnitz University of Technology, Chemnitz, Germany
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Čular D, Ivančev V, Zagatto AM, Milić M, Beslija T, Sellami M, Padulo J. Validity and Reliability of the 30-s Continuous Jump for Anaerobic Power and Capacity Assessment in Combat Sport. Front Physiol 2018; 9:543. [PMID: 29867580 PMCID: PMC5962763 DOI: 10.3389/fphys.2018.00543] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 04/27/2018] [Indexed: 12/20/2022] Open
Abstract
Cycling test such Wingate anaerobic test (WAnT) is used to measure anaerobic power (AP), but not anaerobic capacity (AC, i.e., the metabolic energy demand). However, in sports that do not involve cycling movements (Karate), the continuous jump for 30 s (vertical jumps for 30 s) has been extensively used to measure anaerobic performance in all young athletes. Limited information’s are available concerning its validity and reliability especially in children. As such, the current study aimed to test validity and reliability of a continuous jumps test (the CJ30s), using WAnT as a reference. Thirteen female Karate kids (age: 11.07 ± 1.32 years; mass: 41.76 ± 15.32 kg; height: 152 ± 11.52 cm; training experience: 4.38 ± 2.14 years) were tested on three separate sessions. The first and second sessions were used to assess the reliability using Intra-class correlation coefficient (ICC) of CJ30s, whereas on the third session WAnT was administered. Following CJ30s and WAnT, we assessed AP (1/CJ30s, as jump height [JH], fatigue index [FI], and blood lactate [BL]; 2/WAnT, as mechanical power [P], FI, and BL) and AC as the excess post-exercise oxygen consumption (EPOC). Large/highly significant correlations were found between CJ30s and WAnT EPOCs (r = 0.730, P = 0.003), and BLs (r = 0.713, P = 0.009). Moderate/significant correlations were found between CJ30s and WAnT FIs (r = 0.640, P = 0.014), CJ30s first four jumps mean JH and WAnT peak P (r = 0.572, P = 0.032), and CJ30s mean JH and WAnT mean P (r = 0.589, P = 0.021). CJ30s showed excellent and moderate reliability (ICC) for AP (maximal JH 0.884, mean JH 0.742, FI 0.657, BL 0.653) and AC (EPOC 0.788), respectively. Correlations observed especially in terms of AC between CJ30s and WAnT provide evidence that former may adequately assess anaerobic performance for the young combat athlete. CJ30 is a reliable test and allow an easy assessment of AP and AC in karate children.
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Affiliation(s)
- Drazen Čular
- Faculty of kinesiology, University of Split, Split, Croatia.,Croatian Institute for Kinesiology and Sport, Split, Croatia
| | | | - Alessandro M Zagatto
- Faculty of Sciences, Department of Physical Education, UNESP-São Paulo State University, Bauru, Brazil
| | - Mirjana Milić
- Faculty of kinesiology, University of Split, Split, Croatia
| | - Tea Beslija
- Faculty of kinesiology, University of Split, Split, Croatia
| | - Maha Sellami
- Faculty of kinesiology, University of Split, Split, Croatia
| | - Johnny Padulo
- Faculty of kinesiology, University of Split, Split, Croatia.,University eCampus, Novedrate, Italy
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Viggiano D, Speranza L, Crispino M, Bellenchi GC, di Porzio U, Iemolo A, De Leonibus E, Volpicelli F, Perrone-Capano C. Information content of dendritic spines after motor learning. Behav Brain Res 2018; 336:256-260. [DOI: 10.1016/j.bbr.2017.09.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 09/05/2017] [Accepted: 09/08/2017] [Indexed: 12/20/2022]
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14
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Munera M, Bertucci W, Duc S, Chiementin X. Analysis of muscular activity and dynamic response of the lower limb adding vibration to cycling. J Sports Sci 2017; 36:1465-1475. [DOI: 10.1080/02640414.2017.1398407] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Marcela Munera
- Biomedical Engineering Department, Colombian School on Engineering Julio Garavito, Bogotá, DC, Colombia
| | - William Bertucci
- GRESPI EA 4694, Université de Reims Champagne-Ardenne Moulin de la Housse, Reims Cedex, France
- PSMS Laboratory, Université de Reims Champagne-Ardenne Moulin de la Housse, Reims Cedex, France
| | - Sebastien Duc
- GRESPI EA 4694, Université de Reims Champagne-Ardenne Moulin de la Housse, Reims Cedex, France
- PSMS Laboratory, Université de Reims Champagne-Ardenne Moulin de la Housse, Reims Cedex, France
| | - Xavier Chiementin
- GRESPI EA 4694, Université de Reims Champagne-Ardenne Moulin de la Housse, Reims Cedex, France
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15
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de Melo Dos Santos R, Costa FCE, Saraiva TS, Callegari B. Muscle fatigue in participants of indoor cycling. Muscles Ligaments Tendons J 2017; 7:173-179. [PMID: 28717626 DOI: 10.11138/mltj/2017.7.1.173] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND Indoor Cycling (IC) has been gaining recognition and popularity within recent years and few studies have investigated its benefits for sedentary participants. OBJECTIVE The aim of this study was to evaluate differences in the surface electromyography (sEMG) variables, heart rate (HR), and subjective effort in sedentary participants while they performed an IC session and to compare their results with the trained subjects, to answer the question: Are trained cyclists less susceptible to muscle fatigue, since it is expected that they make less effort? DESIGN Twenty-six volunteers were split into two groups according to their fitness status and weekly training load. Each participant completed an IC session in a private gym, lasting 45 minutes and were encouraged to follow the pedaling frequency and cycle resistance, within their limitations. Main Outcome Measures: HR, participants' subjective effort on the Borg Scale of Perceived Exertion (Borg Scale) and sEMG data were compared between groups. RESULTS 28.6% of the sedentary participants withdrew from the study. Exercise intensity, assessed using the HR, was similar in both groups. The subjective perceived effort, assessed using the Borg Scale, was significantly higher in the sedentary group. All muscles considered in the sedentary group had higher variation levels of Root Mean Square (RMS) and Median Frequency (MF) than those in the trained group. CONCLUSION Sedentary participants are more likely to present fatigue and IC can be incorporated into protocols for this population, but their fitness levels should be taken into account because each performance depends on the individual's physical fitness. LEVEL OF EVIDENCE IIIb.
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Affiliation(s)
- Ricardo de Melo Dos Santos
- Human Motricity Sciences Laboratory, Department of Health Sciences, Federal University of Pará, Belém, Brazil
| | - Flavio Costa E Costa
- Human Motricity Sciences Laboratory, Department of Health Sciences, Federal University of Pará, Belém, Brazil
| | - Thais Sepeda Saraiva
- Human Motricity Sciences Laboratory, Department of Health Sciences, Federal University of Pará, Belém, Brazil
| | - Bianca Callegari
- Human Motricity Sciences Laboratory, Department of Health Sciences, Federal University of Pará, Belém, Brazil
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Padulo J, Ardigò LP, Milić M, Powell DW. Electromyographic analysis of riding posture during the bicycling start moment. MOTRIZ: REVISTA DE EDUCACAO FISICA 2016. [DOI: 10.1590/s1980-6574201600040003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Johnny Padulo
- University e-Campus, Italy; University of Split, Croatia; National Centre of Medicine and Science in Sport, Tunisia
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17
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Zagatto AM, Padulo J, Silva ARSD, Müller PDTG, Miyagi WE, Gobatto CA. Physiological responses at the lactate-minimum-intensity with and without prior high-intensity exercise. J Sports Sci 2016; 34:2106-13. [PMID: 26928746 DOI: 10.1080/02640414.2016.1151921] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
This study examined the physiological responses during exercise-to-exhaustion at the lactate-minimum-intensity with and without prior high-intensity exercise. Eleven recreationally trained males performed a graded exercise test, a lactate minimum test and two constant-load tests at lactate-minimum-intensity until exhaustion, which were applied with or without prior hyperlactatemia induction (i.e., 30-s Wingate test). The physiological responses were significantly different (P < 0.05) between constant-load tests for pulmonary ventilation ([Formula: see text]), blood-lactate-concentration ([La(-)]), pH, bicarbonate concentration ([HCO3]) and partial pressure of carbon dioxide during the initial minutes. The comparisons within constant-load tests showed steady state behaviour for oxygen uptake and the respiratory exchange ratio, but heart rate and rating of perceived exertion increased significantly during both exercise conditions, while the [Formula: see text] increased only during constant-load effort. During effort performed after high-intensity exercise: [Formula: see text], [La(-)], pH and [HCO3] differed at the start of exercise compared to another condition but were similar at the end (P > 0.05). In conclusion, the constant-load exercises performed at lactate-minimum-intensity with or without prior high-intensity exercise did not lead to the steady state of all analysed parameters; however, variables such as [La(-)], pH and [HCO3] - altered at the beginning of effort performed after high-intensity exercise - were reestablished after approximately 30 min of exercise.
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Affiliation(s)
| | | | - Adelino Ramos Sanchez da Silva
- c School of Physical Education and Sports of Ribeirão Preto , University of São Paulo (USP) , Ribeirão Preto , SP , Brazil
| | - Paulo de Tarso Guerrero Müller
- d Laboratory of Respiratory Pathophysiology (LAFIR), Federal University of Mato Grosso do Sul (UFMS) , Campo Grande , MS , Brazil
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18
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Nikolaidis PT, Chtourou H, Torres-Luque G, Tasiopoulos IG, Heller J, Padulo J. Effect of a Six-Week Preparation Period on Acute Physiological Responses to a Simulated Combat in Young National-Level Taekwondo Athletes. J Hum Kinet 2015; 47:115-25. [PMID: 26557196 PMCID: PMC4633247 DOI: 10.1515/hukin-2015-0067] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The aim of this study was to examine changes in physical attributes, physiological characteristics and responses that occurred in a simulated combat during a six-week preparatory period in young taekwondo athletes. Seven athletes (age 12.17 ± 1.11 years) were examined before (pre-intervention) and after (post-intervention) a preparatory period for physical fitness and physiological responses to a 2×90 s simulated bout with a 30 s rest period. The heart rate (HR) was monitored during the simulated combat, and handgrip muscle strength (HMS) along with the countermovement jump (CMJ) were recorded before and after the combat. When compared with pre-intervention values, in post-intervention we observed a decrease in body mass, body fat percentage, and the HR at rest and during recovery after a 3 min step test, and an increase in maximal velocity of the cycle ergometer force-velocity test, the CMJ and mean power during the 30 s continuous jumping test (p<0.05). Furthermore, HR responses to a simulated combat were lower in the post-intervention session (p<0.05). CMJ values increased after the bout in both pre and post-intervention, with higher absolute values in the latter case (p<0.05), whereas there was no difference in HMS. Based on these findings, it can be concluded that the acute physiological responses to a simulated taekwondo combat vary during a season, which might be explained by changes in physical fitness.
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Affiliation(s)
- Pantelis T Nikolaidis
- Department of Physical and Cultural Education, Hellenic Army Academy, Athens, Greece. ; Exercise Physiology Laboratory, Nikaia, Greece
| | - Hamdi Chtourou
- Tunisian Research Laboratory "Sports Performance Optimisation" National Center of Medicine and Science in Sports (CNMSS), Tunis, Tunisia
| | | | - Ioannis G Tasiopoulos
- Faculty of Human Movement and Quality of Life Sciences, University of Peloponnese, Sparta, Greece
| | - Jan Heller
- Faculty of Physical Education and Sport, Charles University in Prague, Czech Republic
| | - Johnny Padulo
- University e-Campus, Novedrate, Italy. ; Tunisian Research Laboratory "Sports Performance Optimisation" National Center of Medicine and Science in Sports (CNMSS), Tunis, Tunisia
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Padulo J. The effect of uphill stride manipulation on race walking gait. Biol Sport 2015; 32:267-71. [PMID: 26424932 PMCID: PMC4577567 DOI: 10.5604/20831862.1166922] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 01/26/2015] [Accepted: 04/01/2015] [Indexed: 11/13/2022] Open
Abstract
Stride length analysis represents an easy method for assessing race walking kinematics. However, the stride parameters emerging from such an analysis have never been used to design a training protocol aimed at increasing stride length. With this aim, we investigated the effects of stride frequency manipulation during three weeks of uphill (2%) training on stride length at iso-efficiency speed. Twelve male race walkers were randomly allocated to one of two training groups: stride frequency manipulation (RWM, n=6) and free stride frequency (RWF, n=6). Results. Kinematic parameters measured before and after the 3-week training in RWM showed increased stride length (4.54%; p<0.0001) and contact time (4.58%; p<0.001); inversely, a decreased stride frequency (4.44%; p<0.0001) and internal work (7.09%; p<0.05) were found. In RWF the effect of the training showed a decrease in stride length (1.18%; p<0.0001) and contact time (<1%; p<0.0001) with respect to baseline conditions and an increased stride frequency and internal work of 1.19% (p<0.0001). These results suggest that using slopes (2%) as RWM could help coaches to provide some training methods that would improve an athlete's performance, through increasing stride length without altering his or her race walking technique or metabolic demands.
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Affiliation(s)
- J Padulo
- University e-Campus, Novedrate ITALY ; Tunisian Research Laboratory "Sports Performance Optimization" National Centre of Medicine and Science in Sport, Tunis, Tunisia
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Abstract
This study aimed to assess the effects of core stability training on lower limbs' muscular asymmetries and imbalances in team sport. Twenty footballers were divided into two groups, either core stability or control group. Before each daily practice, core stability group (n = 10) performed a core stability training programme, while control group (n = 10) did a standard warm-up. The effects of the core stability training programme were assessed by performing isokinetic tests and single-leg countermovement jumps. Significant improvement was found for knee extensors peak torque at 3.14 rad · s(-1) (14%; P < 0.05), knee flexors peak torque at 1.05 and 3.14 rad · s(-1) (19% and 22% with P < 0.01 and P < 0.01, respectively) and peak torque flexors/extensors ratios at 1.05 and 3.14 rad · s(-1) (7.7% and 8.5% with P < 0.05 and P < 0.05, respectively) only in the core stability group. The jump tests showed a significant reduction in the strength asymmetries in core stability group (-71.4%; P = 0.02) while a concurrent increase was seen in the control group (33.3%; P < 0.05). This study provides practical evidence in combining core exercises for optimal lower limbs strength balance development in young soccer players.
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Affiliation(s)
- Antonio Dello Iacono
- a Zinman College of Physical Education and Sport Sciences, Wingate Institute , Israel
| | - Johnny Padulo
- b University e-Campus , Novedrate , Italy.,c Tunisian Research Laboratory "Sports Performance Optimization", National Center of Medicine and Science in Sports , Tunis , Tunisia
| | - Moshe Ayalon
- a Zinman College of Physical Education and Sport Sciences, Wingate Institute , Israel
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Modifications in activation of lower limb muscles as a function of initial foot position in cycling. J Electromyogr Kinesiol 2015; 25:648-52. [PMID: 25921852 DOI: 10.1016/j.jelekin.2015.03.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2014] [Revised: 02/21/2015] [Accepted: 03/25/2015] [Indexed: 11/21/2022] Open
Abstract
Cyclic movements, such as walking/cycling, require the activity of spinal-circuits, the central-pattern-generators (CPG). To our knowledge little work has been done to investigate the activation of these circuits, e.g., the muscular and kinematic activity during cycling initiation. This study aims to detail the muscle output properties as a function of the initial lower limb-position using a simple cycling paradigm. Therefore, subjects were required to pedal on a cycle-ergometer in seated position starting at different-crank-angles (0-150°). Surface-electromyography was recorded from the gluteus major (GL), vastus lateralis (VL), and gastrocnemius medialis (GM), while crank position was recorded using a linear-encoder. Gluteus major peak-activity (PA) occurred at 65.0±12.4° when starting with 0° initial crank position (ICP), while occurred maximally at 110.5±2.9 when starting with 70° ICP. Vastus lateralis PA occurred at 40.7±8.8° with 0° ICP, whereas with 70° ICP PA occurred at 103.4±4.0°. Similarly, GM PA occurred at 112.0±10.7° with 0° ICP, whereas with 70° ICP PA occurred at 142.5±4.2° PA. Gluteus major and gastrocnemius medialis showed similar PA phase shifts, which may suggest they are controlled by same local circuitry, in agreement with their common spinal origin, i.e., motoneurons pool in S1-S2.
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Connick MJ, Li FX. Prolonged cycling alters stride time variability and kinematics of a post-cycle transition run in triathletes. J Electromyogr Kinesiol 2014; 25:34-9. [PMID: 25282575 DOI: 10.1016/j.jelekin.2014.08.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 07/30/2014] [Accepted: 08/21/2014] [Indexed: 10/24/2022] Open
Abstract
Previous studies have employed relatively short cycling protocols to investigate the effect of cycling on muscle activation and kinematics in running. The aim of this study was to investigate the effect of 3h of cycling on stride time variability (STV), stride length, tibialis anterior (TA) activation, and lower limb range of motion (ROM) in a transition run. Eight triathletes completed a run-cycle-run protocol. Data were collected from a pre-cycle run and a transition run after 3h of cycling. STV, stride length and ROM were assessed using three-dimensional motion analysis, and TA activation was recorded using surface electromyography. Results showed that compared with the pre-cycle run triathletes exhibited increased STV (Cohen's d=0.95) and shorter strides (d=0.15) in the transition run (p<0.05). TA activation and ROM did not change. After 10min of transition running, ankle and hip ROM significantly increased (d=0.40 and 0.41 respectively) compared to the beginning of the transition run (p<0.05) but no other changes were observed. The results suggest that locomotor control and kinematics in a transition run are affected by prolonged cycling and stride time variability is potentially a novel method of evaluating the immediate effect of prolonged cycling on the locomotor control of running.
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Affiliation(s)
- Mark J Connick
- School of Human Movement Studies, University of Queensland, Brisbane, Australia.
| | - Francois-Xavier Li
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, UK
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The Usefulness of Session Rating of Perceived Exertion for Monitoring Training Load Despite Several Influences on Perceived Exertion. Int J Sports Physiol Perform 2014; 9:882-3. [DOI: 10.1123/ijspp.2014-0010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Despite various contributing factors, session rating of perceived exertion has the potential to affect a large proportion of the global sporting and clinical communities since it is an inexpensive and simple tool that is highly practical and accurately measures an athlete’s outcome of training or competition. Its simplicity can help optimize performance and reduce negative outcomes of hard training in elite athletes.
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Padulo J, Laffaye G, Bertucci W, Chaouachi A, Viggiano D. Optimisation of starting conditions in track cycling. SPORT SCIENCES FOR HEALTH 2014. [DOI: 10.1007/s11332-014-0192-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
The biomechanical management of bioenergetics of runners when running uphill was investigated. Several metabolic and mechanical variables have been studied simultaneously to spread light on the locomotory strategy operated by humans for effective locomotion. The studied variables were: heart rate, heart rate variability, oxygen intake and blood lactate, metabolic cost, kinematics, ground reaction force and muscular activity. 18 high-level competitive male runners ran at 70% VO2max on different uphill slope conditions: 0%, 2% and 7%. Modifications were significant in almost all variables studied, and were more pronounced with increasing incline. Step frequency/length and ground reaction force are adjusted to cope with both the task of uphill progression and the available (limited) metabolic power. From 0% to 7% slope, step frequency and ground reaction force and metabolic cost increased concurrently by 4%, 12% and 53%, respectively (with a 4% step length decrease as well). It is hypothesised that this biomechanical management is allowed by an environment-body communication performed by means of specific muscular activity.
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Affiliation(s)
- Johnny Padulo
- Tunisian Research Laboratory "Sports Performance Optimization" National Center of Medicine and Science in Sport, Tunis, Tunisia
- Faculty of Medicine and Surgery, University of Tor Vergata, Rome, Italy
| | - Douglas Powell
- Department of Physical Therapy, Campbell University, Buies Creek, North Carolina, United States of America
| | - Raffaele Milia
- Faculty of Medicine and Surgery, University of Cagliari, Cagliari, Italy
| | - Luca Paolo Ardigò
- School of Exercise and Sport Science, Department of Neurological, Neuropsychological, Morphological and Movement Sciences, University of Verona, Verona, Italy
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Dynamics of revolution time variability in cycling pattern: voluntary intent can alter the long-range autocorrelations. Ann Biomed Eng 2013; 41:1604-12. [PMID: 23712680 DOI: 10.1007/s10439-013-0834-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Accepted: 05/21/2013] [Indexed: 10/26/2022]
Abstract
Long-range dependency has been found in most rhythmic motor signals. The origin of this property is unknown and largely debated. There is a controversy on the influence of voluntary control induced by requiring a pre-determined pace such as asking subjects to step to a metronome. We studied the cycle duration variability of 15 men pedaling on an ergometer at free pace and at an imposed pace (60 rpm). Revolution time was determined based on accelerometer signals (sample frequency 512 Hz). Revolution time variability was assessed by coefficient of variation (CV). The presence of long-range autocorrelations was based on scaling properties of the series variability (Hurst exponent) and the shape of the power spectral density (α exponent). Mean revolution time was significantly lower at freely chosen cadence, while values of CV were similar between both sessions. Long-range autocorrelations were highlighted in all series of cycling patterns. However, Hurst and α exponents were significantly lower at imposed cadence. This study demonstrates the presence of long-range autocorrelations during cycling and that voluntary intent can modulate the interdependency between consecutive cycles. Therefore, cycling may constitute a powerful paradigm to investigate the influence of central control mechanisms on the long-range interdependency characterizing rhythmic motor tasks.
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