Report II. Electromyographic study on so-called gojukata

Abstract

The author has obtained the following results after examination of the actions of antagonistic muscles of stiffened shoulders. I) Spontaneous-discharge, The frequency of the discharge was higher in the cases of stiffened shoulders than in the cases of non-stiffened shoulders, in particular, in the cases of so-called gojukata it was the highest at m. latissimus dorsi in contrast with other caused stiffened shoulders. II) Antagonist-discharge: The frequency is high in the cases of stiffened shoulders as well as of spontaneous discharge, in particular, it was frequently observed where the umbalance of the strength of holding muscles of shoulder joint is evident, but the more frequency was detected at m. latissimus dorsi in the cases of so-called gojukata. This fact shows, to the best of my knowledge, tnat the m, latissimus dorsi has strong functions to escape the pain by holding the upper extremity at adducted position, and at the same time, to prevent the instability of humerus-head which might appear through regressive changes of tendon of m. supra spinam. III) The author found that under the age of 34, relatively less cases were observed in which these two discharges appear at shoulders, while they often observed in the cases of so-called gojukata. © 1961, The Showa University Society. All rights reserved.