Mechanical characteristics of knee extension exercises performed on an isokinetic dynamometer

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Bibliographic Details
Title translated into German:Mechanische Merkmale von Kniestreckuebungen auf einem isokinetischen Dynamometer
Author:Chow, J.W.; Darling, W.G.; Hay, J.G.
Published in:Medicine and science in sports and exercise
Published:29 (1997), 6 , S. 794-803, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Print resource
ISSN:0195-9131, 1530-0315
Online Access:
Identification number:PU199801209129

Author's abstract

The purpose of this study was to evaluate selected mechanical characteristics of knee extension exercises performed on a LIDO Active Isokinetic System. A female subject performed two repetitions of maximal effort knee extension at 16 different preset angular velocities (PAVs). The gravitational and inertial effects were included in the computation of the resultant knee torque. For each repetition, the knee flexion angle, the angular velocity and acceleration of the shank, and the knee torque throughout the range of motion were computed. The shank angular acceleration values indicated that if the inertial effect is not considered the knee torque will be underestimated in the initial phase and errors in knee torque up to about 6 N/m can be expected for the rest of the repetition. The durations when the shank angular velocity was within +/-5% and +/-10% of PAV (expressed as percentages of the repetition time) were found to decrease with increasing PAV. The difference between PAV and shank angular velocity at the instant of peak torque also increased with increasing PAV. The results demonstrate the limitations that may exist in isokinetic dynamometers. Verf.-Referat