| A simple method for measuring force, velocity and power output during squat jump. | |
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MedLine Citation:
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PMID: 18789803 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Our aim was to clarify the relationship between power output and the different mechanical parameters influencing it during squat jumps, and to further use this relationship in a new computation method to evaluate power output in field conditions. Based on fundamental laws of mechanics, computations were developed to express force, velocity and power generated during one squat jump. This computation method was validated on eleven physically active men performing two maximal squat jumps. During each trial, mean force, velocity and power were calculated during push-off from both force plate measurements and the proposed computations. Differences between the two methods were not significant and lower than 3% for force, velocity and power. The validity of the computation method was also highlighted by Bland and Altman analyses and linear regressions close to the identity line (P<0.001). The low coefficients of variation between two trials demonstrated the acceptable reliability of the proposed method. The proposed computations confirmed, from a biomechanical analysis, the positive relationship between power output, body mass and jump height, hitherto only shown by means of regression-based equations. Further, these computations pointed out that power also depends on push-off vertical distance. The accuracy and reliability of the proposed theoretical computations were in line with those observed when using laboratory ergometers such as force plates. Consequently, the proposed method, solely based on three simple parameters (body mass, jump height and push-off distance), allows to accurately evaluate force, velocity and power developed by lower limbs extensor muscles during squat jumps in field conditions. |
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Authors:
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Pierre Samozino; Jean-Benoît Morin; Frédérique Hintzy; Alain Belli |
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Publication Detail:
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Type: Journal Article Date: 2008-09-11 |
Journal Detail:
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Title: Journal of biomechanics Volume: 41 ISSN: 0021-9290 ISO Abbreviation: J Biomech Publication Date: 2008 Oct |
Date Detail:
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Created Date: 2008-10-20 Completed Date: 2009-02-05 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0157375 Medline TA: J Biomech Country: United States |
Other Details:
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Languages: eng Pagination: 2940-5 Citation Subset: IM |
Affiliation:
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Exercise Physiology Laboratory (EA 4338), University of Saint-Etienne, CHU Bellevue-Medecine du Sport et Myologie, 42055 Saint-Etienne Cedex 02, France. pierre.samozino@univ-st-etienne.fr |
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Computer Simulation Energy Transfer / physiology* Humans Leg / physiology* Locomotion / physiology* Male Manometry / methods* Models, Biological* Movement / physiology* Physical Exertion / physiology* Stress, Mechanical |
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