Maximum Isometric Knee Flexor and Extensor Muscle Contractions: Normal Patterns of Torque Versus Time

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Abstract
Isometric torque of the knee flexor and extensor muscles was recorded for 5 seconds at three knee joint positions. The subjects included healthy men in age groups from 20 to 35 and 45 to 65 years of age. The amplitude and duration of peak torque and the time to peak torque were measured for each contraction. Peak torque was usually maintained less than 0.1 second and never longer than 0.9 second. At each of the three angles, the mean extensor muscle torque was higher than the mean flexor muscle torque in both age groups, and the mean torque for both muscle groups was higher among the younger than among the older men. The highest average torque was recorded at the knee angle of 60 degrees for the extensor muscles and 45 degrees for the flexor muscles, but this was not always a stereotyped response either for a given individual or among individuals.

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