title: Reliability of measurements of concentric and eccentric isokinetic loading.
abstract: The purpose of this study was to assess the reliability of a method for testing peak torque and work output of the knee extensor muscle during concentric and eccentric loading at three velocities of exercise (60 degrees, 120 degrees, and 180 degrees/sec). Fourteen healthy men (23-32 years of age) performed exercises of the quadriceps femoris muscles during concentric and eccentric loading, with a five-second pause between each contraction. Three different tests were performed on different occasions. The first exercise session was a practice session, and the next two sessions were established to collect data in a test-retest format. Peak torque and work were measured for the two testing sessions. The results of this study demonstrated that with a very specific protocol, the reliability of concentric peak torque and work measurements was excellent at 60 degrees and 120 degrees/sec and good at 180 degrees/sec. In contrast, reliability of eccentric peak torque and work measurements was good at 120 degrees and 180 degrees/sec but low at 60 degrees/sec.
authors: University Hospital-Milton S. Hershey Medical Center, Pennsylvania State University, Hershey 17033.
authors: T J
authors: TJ
authors: Tredinnick
authors: P W
authors: PW
authors: Duncan
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D009068:Movement; D009132:Muscles / Q000502:physiology*; D005082:Physical Exertion