ヒト総指伸筋のIsometric contraction中の機能的筋硬度の変化について

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Since there are no standard methods or instruments for measuring muscle stiffness, the relationship between muscle force and muscle stiffness seems not to have been previously investigated. We have been much interested in muscle stiffness observed during muscle activity and/or muscle fatigue. The purpose of present investigation was to clarify the influencing factors on muscle stiffness during stepwise increased muscle tension in submaximum isometric contraction. Non-invasive measurement of muscle stiffness was based on the principle of the pushing method. Muscle stiffness was determined in the extensor digitorum at rest and during muscle contraction of 5kgf, l0kgf, 15kgf, 20kgf, 25kgf and 30kgf. The mean value of muscle stiffness at rest was 434.2±188.2gf/cm^2, and at each stage muscle tension values were 727.4±111.5gf/cm^2, 925.6±251.4gf/cm^2, 1306.8±386.0gf/cm^2, 1504.3±406.6gf/cm^2, 1698.5±601.8gf/cm^2, and 1935.2±632.4gf/cm^2 respectively. A steeper straight line was observed in muscle tension exerted by contraction and muscle stiffness until 55% of MVC, and there was a high correlation (r=0.878, P<0.01) between muscle stiffness and %MVC. Hysteresis in strain-stress curves were observed not only at rest but also during muscle contraction. Furthermore, the loop areas in hysteresis gradually increased in acordance with increase of muscle tension. Despite decrease in the blood flow velocity with the increased load, no complete stop of blood flow was observed in the muscle contraction. Even if the load was fixed for 5 minutes at 15%MVC, the slight increase was found for hysteresis, circumference and EMG during the sustained isometric handgrip strength. These results suggest that the study of muscle stiffness and hysteresis is in relation to the peripheral circulatory factors as well as neuronal ones.
日本運動生理学会の論文
2001-02-26

ヒト総指伸筋のIsometric contraction中の機能的筋硬度の変化について

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