흰쥐에 있어서 자극된 근의 수축량 및 혈장량에 관한 실험

Abstract

Gastrocnemius muscle of 27 rats were stimulated intermittently and tetanically for 30 minutes. The total number of contractions was 7,000. The following results were obtained. 1. There was an increase in the water content of the stimulated muscle. The water content in resting muscle was 75.8% and that in the stimulated muscle was 79.3% 2. The increase in water content of stimulated muscle was found to be in the increase in extracellular water, namely, plasma volume (RISA distribution volume) and thiocyanate space. Thiocyanate space increased from 18.3% to 26.0% muscle weight. Plasma volume increased from 1.7% to 6.0% and tissue blood volume from 3.1% to 11.5% of muscle weight. 3. Intracellular water of muscle tissue decreased, on the contrary. Intracellular water in resting control muscle was 57.5% and that in stimulated muscle was 53.3% of muscle weight. 4. Other values were: total circulating plasma volume 4.5% body weight , total circulating blood volume 8.5%. and total body thiocyanate space 38.2% body weight in the nephrectomized rat. 5. Water shift in stimulated muscle was discussed.