Concurrent Validity of a Portable Force Plate Using Vertical Jump Force-Time Characteristics.

Abstract:

:This study examined concurrent validity of countermovement vertical jump reactive strength index modified and force-time characteristics recorded using a 1-dimensional portable and laboratory force plate system. Twenty-eight men performed bilateral countermovement vertical jumps on 2 portable force plates placed on top of 2 in-ground force plates, both recording vertical ground reaction force at 1000 Hz. Time to takeoff; jump height; reactive strength index modified; and 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 < 0.12) 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% confidence limits, 0.9%-2.5%), indicating very good agreement across all of the dependent variables. The largest limits of agreement were for jump height (2.1%), time to takeoff (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 countermovement vertical jump. Thus, practitioners can use both force plates interchangeably.

journal_name

J Appl Biomech

authors

Lake J,Mundy P,Comfort P,McMahon JJ,Suchomel TJ,Carden P

doi

10.1123/jab.2017-0371

subject

Has Abstract

pub_date

2018-10-01 00:00:00

pages

410-413

issue

5

eissn

1065-8483

issn

1543-2688

journal_volume

34

pub_type

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