Validity and Reliability of the LIDO Active Isokinetic System

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Abstract
No grant monies were used for this research. When evaluating a strength testing method, reliability rather than validity, the most critical component, is most frequently addressed. The purpose of this study was to assess the validity and reliability of the LIDO Active system in the isokinetic mode. Velocity and torque were continuously monitored while torques of 10.4, 25.6, 30.6, and 89.6 ft-lb were applied to the actuator with the speed set at 5 degrees /sec. This was done through a 200 degrees arc of motion concentrically and eccentrically. The procedure was repeated one week later to determine reliability. Analysis of variance revealed no significant variance associated with the date of measurement regarding angular velocity. The maximum deviation of angular velocity from the selected speed was 0.02 degrees /sec. Pearson's r values for measured torque averaged r = 1.00 using paired data from the two test dates. The mean correlation coefficient relating observed to expected torques was Rho = 0.98. These results demonstrate that the LIDO Active system is both valid and reliable within the torque and velocity limitations described. J Orthop Sports Phys Ther 1992;15(1):32-36.

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