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Hasegawa T, Muratomi K, Furuhashi Y, Mizushima J, Maemura H. Effects of high-intensity sprint exercise on neuromuscular function in sprinters: the countermovement jump as a fatigue assessment tool. PeerJ 2024; 12:e17443. [PMID: 38827313 PMCID: PMC11143976 DOI: 10.7717/peerj.17443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 04/30/2024] [Indexed: 06/04/2024] Open
Abstract
Background High-intensity sprint exercises (HIS) are central to sprinter training and require careful monitoring of athlete muscle fatigue to improve performance and prevent injury. While the countermovement jump (CMJ) may be used to monitor neuromuscular fatigue (NMF), little is known about the specific effects from HIS. The purpose of this study is to investigate the effects of HIS on the CMJ to assess its utility for assessing NMF following HIS. Methods Ten male collegiate 400 m sprinters completed a 400 m sprint fatigue protocol and underwent five CMJ-testing sessions (baseline, 3 minutes, 10 minutes, 1 hour and 24 hours) over two days. Three CMJ trials, performed on a force plate, were completed each trial, with rating of perceived exertion (RPE) recorded as a subjective fatigue measure. Changes in RPE, CMJ variables, force-time and power-time curves at baseline and post fatigue were assessed. Results Significant changes were observed in most variables following the fatigue protocol. In particular, concentric mean power remained significantly lower after 24 hours compared to baseline. In addition, the force-time curves exhibited a significant reduction in all conditions following the fatigue protocol. This decline was most pronounced within 50-75%of the concentric phase relative to baseline measurements. Conclusion. Results indicate that the CMJ may be a useful tool for monitoring fatigue in at least 400 m sprinters. These data also indicate that HIS may disproportionately reduce force output in during concentric movement. These insights may improve training prescriptions and injury prevention strategies for sprint athletes.
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Affiliation(s)
- Takahiro Hasegawa
- Hillside Teachers’ College, Bulawayo, Zimbabwe
- Japan Overseas Cooperation Volunteers, Japan International Cooperation Agency, Tokyo, Japan
| | - Kotaro Muratomi
- Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan
| | - Yuki Furuhashi
- Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan
| | - Jun Mizushima
- Faculty of Health and Sports Sciences, Toyo University, Tokyo, Japan
| | - Hirohiko Maemura
- Faculty of Health and Sport Sciences, University of Tsukuba, Ibaraki, Japan
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Smith JC, Lamont HS, Barefoot M. Comparison of Different Take-off Thresholds When Assessing Vertical Jump Performance. INTERNATIONAL JOURNAL OF EXERCISE SCIENCE 2024; 17:660-668. [PMID: 38863789 PMCID: PMC11166131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
Reliably determining vertical jump (VJ) take-off on a force plate is crucial when identifying performance-related biomechanical factors. Therefore, the purpose of this study was to compare several take-off thresholds (20 N, 10 N, 5 N, 1 N, five standard deviations above an unloaded force plate (5SD), and peak residual force (PkRes) produced when the force plate was unloaded) in terms of jump height (JH), movement time (MT), reactive strength index modified (RSImod), net impulse (netIMP), and propulsive impulse (prIMP). Twenty-one participants performed five countermovement VJs on a force plate. All thresholds were reliable with intraclass correlations ≥ 0.835 and coefficient of variation < 10%. Our results show significant differences across the different take-off thresholds for JH, MT, RSImod, netIMP, and prIMP. However, these differences were considered trivial based on effect sizes. While differences in these thresholds may not be practically meaningful, practitioners are encouraged to consider the noise in the force-time signal and select an appropriate threshold that matches PkRes within their given environment.
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Affiliation(s)
- Jason C Smith
- Department of Kinesiology, Coastal Carolina University, Conway, SC, USA
| | - Hugh S Lamont
- College of Health Solutions, Arizona State University, Scottsdale, AZ, USA
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Riboli A, Francini L, Rossi E, Caronti A, Boldrini L, Mazzoni S. Top-class women's soccer performance: peak demands and distribution of the match activities relative to maximal intensities during official matches. Biol Sport 2024; 41:207-215. [PMID: 38188116 PMCID: PMC10765427 DOI: 10.5114/biolsport.2024.129477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 04/19/2023] [Accepted: 05/29/2023] [Indexed: 01/09/2024] Open
Abstract
The aims of the current study were to determine the most demanding passages of match play (MDP) and the distribution of match activities relative to maximum intensities during official matches in top-class women soccer players. Twenty-eight women players competing in European championship and international UEFA competitions were monitored during 38 official matches (277 individual samples). Maximum relative (m · min-1) total distance (TD), high-speed running (HSRD), very high-speed running (VHSRD), sprint, acceleration and deceleration distances were calculated across different durations (1-5, 10, 15, 90 min) using a rolling average analysis. Maximum intensities (1-minpeak) were used as the reference value to determine the distribution of relative intensity across the whole-match demands (90-minavg). Time and distance higher than 90-minavg (> 90-minavg) were also calculated. MDP showed moderate to very large [effect size (ES): 0.63/5.20] differences between 1-minpeak vs all durations for each parameter. The relative (m · min-1) 1-minpeak was greater than 90-minavg of about +63% for TD, +358% for HSRD, +969% for VHSRD, +2785% for sprint, +1216% for acceleration, and +768% for deceleration. The total distance covered > 90-minavg was ~66.6% of the total distance covered during the 90-minavg for TD, ~84.8% for HSRD, ~97.4% for VHSRD, ~100% for sprint, ~99.1% for acceleration and ~98.2% for deceleration. The relative distance > 90-minavg was higher (P < 0.05) than the 90-minavg for each metric (ES: 2.22 to 7.58; very large). The present results may help coaches and sport scientists to replicate the peak demands during training routine in top-class women soccer players.
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Affiliation(s)
- Andreas Riboli
- MilanLab Research Department, AC Milan S.p.A., Milan, Italy
- Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, Italy
| | - Lorenzo Francini
- MilanLab Research Department, AC Milan S.p.A., Milan, Italy
- Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, Italy
| | - Emanuele Rossi
- MilanLab Research Department, AC Milan S.p.A., Milan, Italy
| | - Andrea Caronti
- MilanLab Research Department, AC Milan S.p.A., Milan, Italy
| | - Lorenzo Boldrini
- MilanLab Research Department, AC Milan S.p.A., Milan, Italy
- Isokinetic Medical Group, FIFA Medical Centre of Excellence, Milan, Italy
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Frazer L, Templin T, Eliason TD, Butler C, Hando B, Nicolella D. Identifying special operative trainees at-risk for musculoskeletal injury using full body kinematics. Front Bioeng Biotechnol 2023; 11:1293923. [PMID: 38125303 PMCID: PMC10731296 DOI: 10.3389/fbioe.2023.1293923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Accepted: 11/21/2023] [Indexed: 12/23/2023] Open
Abstract
Introduction: Non-combat musculoskeletal injuries (MSKIs) during military training significantly impede the US military's functionality, with an annual cost exceeding $3.7 billion. This study aimed to investigate the effectiveness of a markerless motion capture system and full-body biomechanical movement pattern assessments to predict MSKI risk among military trainees. Methods: A total of 156 male United States Air Force (USAF) airmen were screened using a validated markerless biomechanics system. Trainees performed multiple functional movements, and the resultant data underwent Principal Component Analysis and Uniform Manifold And Projection to reduce the dimensionality of the time-dependent data. Two approaches, semi-supervised and supervised, were then used to identify at-risk trainees. Results: The semi-supervised analysis highlighted two major clusters with trainees in the high-risk cluster having a nearly five times greater risk of MSKI compared to those in the low-risk cluster. In the supervised approach, an AUC of 0.74 was produced when predicting MSKI in a leave-one-out analysis. Discussion: The application of markerless motion capture systems to measure an individual's kinematic profile shows potential in identifying MSKI risk. This approach offers a novel way to proactively address one of the largest non-combat burdens on the US military. Further refinement and wider-scale implementation of these techniques could bring about substantial reductions in MSKI occurrence and the associated economic costs.
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Affiliation(s)
- Lance Frazer
- Southwest Research Institute (SwRI), San Antonio, TX, United States
| | - Tylan Templin
- Southwest Research Institute (SwRI), San Antonio, TX, United States
| | | | - Cody Butler
- United States Air Force, Special Warfare Training Wing Research Flight, Joint Base San Antonio-Lackland, San Antonio, TX, United States
| | - Ben Hando
- United States Air Force, Special Warfare Training Wing Research Flight, Joint Base San Antonio-Lackland, San Antonio, TX, United States
- Kennell and Associates Inc, Falls Church, VA, United States
| | - Daniel Nicolella
- Southwest Research Institute (SwRI), San Antonio, TX, United States
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Fu H, Li Z, Zhou X, Wang J, Chen Z, Sun G, Sun J, Zeng H, Wan L, Hu Y, Wang F, Zheng J. The profiles of single leg countermovement jump kinetics and sprinting in female soccer athletes. Heliyon 2023; 9:e19159. [PMID: 37664742 PMCID: PMC10469566 DOI: 10.1016/j.heliyon.2023.e19159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 08/12/2023] [Accepted: 08/14/2023] [Indexed: 09/05/2023] Open
Abstract
The purposes were to evaluate kinetics in lower limbs using single leg countermovement jump (SLCMJ) and to identify the differences in SLCMJ kinetics between sprinting fast players and sprinting slow players in elite university female soccer players. Seventeen participants at the national tournament level completed the survey. SLCMJ and 30 m sprinting tests were performed. A force-plate was used to collect the data of the SLCMJ test. Significant differences of concentric maximum rate of force development (RFD), concentric RFD, concentric RFD/body weight (BW), peak net takeoff force/BW, peak power, and peak power/BW existed between both legs during the SLCMJ among all the participants. For further analysis, the participants were divided into fast group and slow group based on sprinting performance. Significant differences existed between the two groups in concentric peak velocity (nondominant, p = 0.028) and vertical velocity at takeoff (nondominant, p = 0.021). Concentric maximum RFD (p = 0.036) was significantly different between both legs in the slow group. Among elite university female soccer players, the players who presented more increased asymmetry of kinetic characteristics of jumping, also showed weak sprinting performance. Moreover, the players presented the best performance in velocity of the jumping variables and also had the best sprinting performance. Coaches and players should focus on keeping inter-limb balance and developing jumping velocity to improve sports performance. In future, the cause-and-effect relationship between jumping and sprinting should be identified.
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Affiliation(s)
- Honghao Fu
- School of Physical Education, Huazhong University of Science and Technology, China
| | - Zhiyuan Li
- Department of Public Physical and Art Education, Zhejiang University, China
| | - Xiao Zhou
- School of Physical Education, Huazhong University of Science and Technology, China
| | - Jiaoqin Wang
- Capital University of Physical Education and Sports, China
| | - Zhuo Chen
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan
| | - Guanrong Sun
- Department of Public Physical and Art Education, Zhejiang University, China
| | - Jingbo Sun
- School of Physical Education, Huazhong University of Science and Technology, China
| | - Hongtao Zeng
- School of Physical Education, Huazhong University of Science and Technology, China
| | - Laihong Wan
- School of Physical Education, Huazhong University of Science and Technology, China
| | - Yueying Hu
- School of Physical Education, Huazhong University of Science and Technology, China
| | - Feng Wang
- School of Physical Education, Huazhong University of Science and Technology, China
| | - Junyi Zheng
- School of Physical Education, Huazhong University of Science and Technology, China
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Ferreira ARP, Macedo VOC, Boullosa D, Vieira A. Identifying Consistent Metrics from the Force-Time Curve of the Countermovement Jump in Combat Fighters and Physically Active Men. INTERNATIONAL JOURNAL OF EXERCISE SCIENCE 2023; 16:1038-1051. [PMID: 37649782 PMCID: PMC10464753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
We investigated the consistency of metrics obtained from the unweighting, braking, propulsive, and landing phases of the countermovement (CMJ) force-time curve in combat fighters and physically active men. Combat fighters (n=21) and physically actives (n=21) were tested for three days (2-7 days apart). Participants performed four maximal CMJ separated by 1-min for between-day comparisons. From force-time recording, the consistency of 16 CMJ metrics (peak and mean ground reaction forces (GRF), net impulse, and duration from each phase) was investigated using the intraclass correlation coefficient (ICC) and typical error (CVTE). We considered as "consistent" those metrics showing no systematic differences, ICC ≥ 0.75, and CVTE ≤ 10%. We further compared the CVTE between groups and pairs of trials (days). Participants demonstrated more consistency in the braking and propulsive phases, while the unweighting phase did not show any consistent metric. There was no evidence of a learning effect (systematic changes), but analysis appointed more consistency on days 2-3 than on days 1-2 (18 metrics presented lower CVTE while 11 presented higher). We identified braking and propulsive GRF (peak and mean) and propulsive impulse as consistent metrics for combat fighters, while only propulsive impulse for physically actives. The between-group analyses showed that 24 comparisons favored the combat fighters against only five favoring the physically actives. In conclusion, force-time metrics related to jumping strategy, like phase duration, are less consistent than those related to driven forces and jump output, probably because participants changed their jump strategy during testing days.
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Affiliation(s)
| | - Victor O C Macedo
- College of Physical Education, University of Brasília, Brasília, DF, BRAZIL
| | - Daniel Boullosa
- Integrated Health Institute, Federal University of Mato Grosso do Sul, Campo Grande, MT, BRAZIL
| | - Amilton Vieira
- College of Physical Education, University of Brasília, Brasília, DF, BRAZIL
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Barefoot M, Lamont H, Smith JC. Comparison of the Reliability of Four Different Movement Thresholds When Evaluating Vertical Jump Performance. Sports (Basel) 2022; 10:sports10120193. [PMID: 36548490 PMCID: PMC9783824 DOI: 10.3390/sports10120193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 11/21/2022] [Accepted: 11/24/2022] [Indexed: 12/03/2022] Open
Abstract
Analyzing vertical jumps performed on a force plate can be useful for the strength and conditioning professional in managing neuromuscular fatigue. The purpose of this study was to compare different movement thresholds when analyzing countermovement (CJ) and squat jump (SJ) performance. Twenty-one college-aged participants (9 female, 12 male) performed five CJs and five SJs. Movement initiation was identified when the vertical ground reaction force (VGRF) deviated five standard deviations (5SD), four standard deviations, (4SD), 2.5% of system weight (2.5%SW), and 10% of system weight (10%SW) from their starting position. For CJs, movement was determined when the VGRF deviated either above or below these thresholds (5SDAB, 4SDAB, 2.5%SWAB, 10%SWAB) and was compared to when VGRF deviated below these thresholds (5SDB, 4SDB, 2.5%SWB, 10%SWB) in terms of peak force (Fmax), net impulse (netIMP), braking impulse (brIMP), propulsive impulse, jump height (JHT), peak power (Pmax), peak velocity (Vmax), and RSImod. For SJs, movement was determined when VGRF initially rose above these thresholds (5SD, 4SD, 2.5%SW, and 10%SW) for Fmax, netIMP, JHT, and Vmax. Significant differences were observed among several methods except for Fmax. However, these differences were small. All CJ measures demonstrated good-to-excellent relative reliability (ICC: 0.790−0.990) except for netIMP for 2.5%SWAB (ICC: 0.479). All methods demonstrated good absolute reliability as measured by percent coefficient of variation (CV%) except brIMP and RSImod. This may be due to instructions given to each jumper as well as skill level. For SJs, no differences in Fmax or netIMP were found across all methods. Small differences were seen for JHT, Pmax, and Vmax across several methods. All methods produced acceptable CV% (<10%) and excellent ICCs (0.900−0.990). However, some jumpers produced CV% that was greater than 10% when determining JHT for 5SD, 4SD, and 2.5%SW methods. This could be due to our method of obtaining system weight. Based on our findings, we recommend using the 10%SW method for assessing SJ performance on a force plate.
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