P781

Summary

PALEČEK, F. (Res. Inst. Natural Drugs, Prague). Mechanical Aspects of Muscle Contraction during Activity. Physiol. bohemoslov. 14 (1) : 23-27, 1965.

   1. In experiments on isolated rat solei we found an increased compliance after fatigue, induced by repeated maximum tetanic contractions in isometric conditions. The muscle compliance was estimated partly as the passive stretch-tension relationship, partly as load-extension relationship; further, as elongation of the muscle between single tetani, when continuously loaded by a small weight. Decrease in the speed of contraction was demonstrated by calculating the twitch/tetanus ratio, which was lowered significantly during fatigue.

   2. We assume that the mechanical aspect plays an important role in the origin of muscle fatigue in the given experimental conditions.