[Study of acoustic waves in stressed muscle].

The spectral characteristics of mechanical vibrations generated by stressed human biceps, referred to as "muscle sounds", were studied. Attempts were made to establish a relationship between these vibrations and conformational rearrangements of muscle proteins during contraction. It was found experimentally that the steepness of the spectral amplitudes of vibrations varies with muscle load. The method proposed made it possible to quantitatively study vibrations of frequencies up to 1 kHz.