Biodex machine を用いた膝屈伸筋の筋出力について

Abstract

The work of the quadriceps muscle of the thigh (extensor) and the hamstrings (flexor) were evaluated on an isokinetic machine in untrained healthy subjects. The subjects were 13 males and 13 females aged 19-31 years (mean, 24.3 years for males and 20.8 years for females). An isokinetic Biodex Machine was used to determine the relationship between the maximum torque and the joint angle, the time the maximum torque was reached, and the work of the muscle as measured by the power output and endurance of the muscles during isokinetic contraction. Maximum torque was greater in males than in females for both the extensor and flexor muscles, and greater in the extensor muscle than in the flexor muscle for both sexes. No major sex difference was observed in the relationship between the maximum torque and the joint angle. The time until maximum torque was reached was slightly shorter in males than in females for both the extensor and flexor muscles, and shorter for the extensor muscle than the flexor muscle. The power of both the extensor and flexor muscle was reduced as the number of flexion extension exercise increased, but the reduction was more remarkable for the extensor. The values obstained in this study are considered to be of use for evaluating the muscle strength and endurance of untrained individuals as well as for establishing rehabilitative goals.