A New Functional Measurement of Muscle Stiffness in Humans :

NDLデジタルコレクション 被引用文献4件

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We developed an instrument for the functional measurement of muscle stiffness that permits objective measurement of comprehensive stiffness of in vivo muscle tissue according to the principle of the pushing method. We experimented with its application to the pressure-displacement relationship of visco-elastic models and muscle stiffness and softness. The relationship between the internal pressure and the pressure-displacement curve of a ball was investigated. The slope of pressure-displacement curve increased in proportion to the rise in internal pressure, suggesting the accuracy of the instrument. Muscle stiffness was minimal at an elbow angle of 90°. There were significant differences in muscle stiffness between 90° and 130° and between 90° and 150° at the 5% level and between 90° and 170° at the 1% level. Muscle stiffness after brachial arterial and venous occlusion was significantly greater than that under the nonrestraint condition at rest (p<0.05). Muscle stiffness during isometoric muscle contraction increased with increased muscle contractility, showing a close correlation (r=0.863). These results suggest that, when the conditions of measurement are arranged, the instrument for the functional measurement of muscle stiffness developed in the present study permits the determination of muscle stiffness not only at rest but also during dynamic muscle activities.

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