[Nucleic acid concentration and ribonuclease activity in muscles during their activity]

The content of RNA, activity of RNase and content of amino acids in skeletal muscles were studied as affected by muscular activity. The RNA level is shown to increase in the muscles of trained and untrained animals. The RNase activity lowers in animals of both groups. The load causes quantitative changes in amino acidic composition of the muscles; the content of cystine, cysteine, asparaginic acid, lysin and leucine decreases.