Reliability of the Lido Linea closed kinetic chain isokinetic dynamometer

Due to increasing emphasis on closed kinetic chain exercises in rehabilitation, there is a need to objectively quantify their effectiveness. The purpose of this study was to determine the test-retest reliability of the peak force and total work scores during a concentric isokinetic leg press pattern using the Lido Linea closed kinetic chain isokinetic dynamometer. The static calibration of force measurements was established by hanging a series of certified weights from a lever arm of known length affixed to the system's force measurement shafts. A repeated-trials, multiple-day experimental paradigm was utilized to establish the static calibration procedure's reliability. No significant difference was found between expected and observed force scores (p > .05). Thirty healthy, active subjects (22.5 +/- 3.9 years) performed concentric isokinetic leg press exercise under maximal voluntary conditions across a velocity spectrum of 25.4, 50.8, and 76.2 cm/sec (10, 20, and 30 inch/sec) in a test-retest experimental paradigm, separated by 24-72 hours. Intraclass correlation coefficient values (ICC 2,1) across Day 1 and Day 2 for peak force and total work ranged from 0.87 to 0.94 (p < .05). The data indicate that the Lido Linea closed kinetic chain isokinetic dynamometer is an appropriate instrument for assessing concentric isokinetic performance during a closed kinetic chain leg press pattern.