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Rehabilitation Practice and Science

Translated Title

正常年輕人大腿肌肉的等速及等長收縮研究

Abstract

Summary In order to establish normal data of the isokinetic (IK) and isometric (IM) contraction of the quadriceps (Q) and hamstring (H) muscles, 22 normal young men and 24 normal young women were tested with a Cybex II Isokinetic Dynamometer at the speed of 0,5,10,20,and 30 rpm (0 rpm= isometric contraction). The IM contraction was tested at 45, 60, and 90 degrees of knee flexion in the Q muscles, and at 30, 45, and 60 degrees in the H muscles. Peak IK and IM torque of Q and H were obtained from both sexes. The peak IK torque values were significantly decreased as the speed in men, and at 60 or 90 degrees in women. The maximal IM strength of H muscles was found at 30 degrees in both sexes. Both IM and IK torque of Q and H were positively correlated with the subject's body weight (BW) and thigh girth. The ratio of females to males ranged from 58.3 to 76 per cent for Q torque, and ranged from 60 to 66 per cent for H torque. If BW was taken into consideration, the ratio became higher, ranging from 66 to 79 per cent, but the strength of females was still significantly lower than that of men. The maximal IM torque(ft-lb)in men expressed as torque per pound of BW was approximately 1(1.08), which made the comparison with other torques easier. Normally a subject's Q torque in ”non-dominant” leg should be equal to or greater than 75 per cent of that in the ”dominant” leg. For H muscles, the ratio should be 65 percent or higher.

Language

English

First Page

16

Last Page

22

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