Reliability of Selected Measures of Musculoskeletal Function Obtained during Closed Kinetic Chain Exercises at Multiple Velocities


Healthy young men (n = 52) and women (n = 50) with varied training backgrounds helped to determine the reliability of selected tests of musculoskeletal function derived from closed kinetic chain concentric exercise. Testing involved a computer controlled squat exercise at 6 velocities. The following were measured at each squat speed: peak force, average force, peak force to body weight ratio (relative peak force), average force to body weight ratio (relative average force), peak power, average power, peak power to body weight ratio (relative peak power), average power to body weight ratio (relative average power), work, relative peak position, peak hold time, pulse duration, and rise time. Subjects participated in two identical testing sessions separated by 48 hrs. Reliability was determined via coefficient alpha. Results revealed consistently high reliability levels (≥0.94) for all force, power, and work measurements. Reliability coefficients were somewhat lower and more variable for the remaining variables, especially those associated with timing. Thus it appears that the force, power, and work variables generated during the isokinetic squat exercises may be reliably obtained from healthy young men and women.

Publication Title

Journal of Strength and Conditioning Research