The development of an isokinetic squat device: reliability and relationship to functional performance

European Journal of Applied Physiology and Occupational Physiology
G J WilsonM R Fisher

Abstract

This study was performed to determine the reliability and validity of a new isokinetic squat device in comparison to knee-extension tests performed using a Cybex. Athletic male subjects (n = 29) performed a series of isokinetic squat tests at 0.4 m.s-1, knee-extension tests at 1.05, 2.09 and 3.14 rad.s-1, and a 6-s stationary cycle test which was used as the measure of functional performance. The squat tests included a purely concentric squat without pre-load, a test with pre-load and a stretch-shorten cycle test. Two trials of each test were performed on one testing occasion. Intraclass correlation co-efficients (r = 0.89-0.96) and co-efficients of variation (3.1-8.7%) were determined between trials, and these indicated that all of the tests were highly reliable. The velocity characteristics of the newly developed system demonstrated that it was an effective isokinetic device, with the mean velocity of 0.41 m.s-1 varying within narrow limits, a relatively small velocity overshoot and an isokinetic portion of movement of approximately 80%. The squat tests demonstrated a higher relationship to cycling performance (r = 0.57-0.65) as compared to the knee-extension tests (r = 0.45-0.51). This difference was amplified when a more ho...Continue Reading

Citations

Feb 17, 2005·European Journal of Applied Physiology·Anna FrohmAlf Thorstensson
Nov 28, 2006·Journal of Sports Sciences·Nigel HarrisJustin Keogh
Sep 16, 2008·Journal of Biomechanics·Pierre SamozinoAlain Belli
Jan 1, 2015·Computational and Mathematical Methods in Medicine·Vytautas GrigasPranas Žiliukas
Nov 8, 2016·Medicine and Science in Sports and Exercise·Christian HellandGøran Paulsen
Sep 18, 2013·Journal of Applied Biomechanics·Matt S Stock, Micheal J Luera
Feb 23, 2019·Journal of Strength and Conditioning Research·Zeevi Dvir, Steffen Müller
Oct 25, 2016·Journal of Strength and Conditioning Research·Lee A BridgemanDeborah K Dulson

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