Differential Fatiguability of Human Skeletal Muscles

概要

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Fatiguability for sustained isometric contraction was investigated for human limb muscles by means of frequency analysis of the bipolar surface electromyogram. The contraction strength was two-thirds or a half of themaximum strength. The increase of slow wave ratio (the proportion of the integrated amplitude in the frequency component below 60 Hz to the total activity) in the electromyogram from initial slow wave ratio was calculated to evaluate muscle fatigue. The triceps brachii was more fatiguable than biceps brachii and brachioradialis, the extensor carpi ulnaris more than flexor carpi ulnaris, the semitendinosus more than rectus femoris, vastus medialis and vastus lateralis, and the tibialis anterior more than gastrocnemius and soleus. The muscles of lower limb, especially the knee extensors and the calf muscles, were less fatiguable than the muscles of upper limb. In the upper limb, the extensors were more fatiguable than the flexors. No consistent difference in fatiguability was observed between the one-joint and two-joint muscles. Differential fatiguability could be due to the differences in muscle fiber composition.
日本人類学会の論文