Concurrent validity of a portable force plate using vertical jump force-time characteristics

Lake, Jason P., Mundy, Peter D., Comfort, Paul, McMahon, John, Suchomel, Timothy J. and Carden, Patrick J. C. (2018) Concurrent validity of a portable force plate using vertical jump force-time characteristics. Journal of Applied Biomechanics. pp. 1-16. ISSN 1065-8483

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Abstract

This study examined concurrent validity of countermovement vertical jump (CMJ) reactive strength index modified and force-time characteristics recorded using a one dimensional portable and laboratory force plate system. Twenty-eight men performed bilateral CMJs on two portable force plates placed on top of two in-ground force plates, both recording vertical ground reaction force at 1000 Hz. Time to take-off, jump height, reactive strength index modified, braking and propulsion impulse, mean net force, and duration were calculated from the vertical force from both force plate systems. Results from both systems were highly correlated (r.99). There were small (d<.12) but significant differences between their respective braking impulse, braking mean net force, propulsion impulse, and propulsion mean net force (p<.001). However, limits of agreement yielded a mean value of 1.7% relative to the laboratory force plate system (95% CL: .9% to 2.5%), indicating very good agreement across all of the dependent variables. The largest limits of agreement belonged to jump height (2.1%), time to take-off (3.4%), and reactive strength index modified (3.8%). The portable force plate system provides a valid method of obtaining reactive strength measures, and several underpinning force-time variables, from unloaded CMJ and practitioners can use both force plates interchangeably.

Item Type: Article
Uncontrolled Keywords: Countermovement jump, force plates, method comparison, Biophysics, Rehabilitation, Orthopedics and Sports Medicine
Subjects: Q Science > QP Physiology
Divisions: Research Centres > CCASES
Departments > Sport and Exercise Sciences
Depositing User: Jason Lake
Date Deposited: 20 Jun 2018 09:36
Last Modified: 24 Oct 2018 13:52
URI: http://eprints.chi.ac.uk/id/eprint/3489

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