[ATPase activity of rabbit skeletal muscles actomyosin complex under ultrasound effect]

Influence of continuous and impulsive ultrasound 0.05; 0.2; 0.4; 0.7 and 1.0 W/cm2 on ATPase activity of rabbit skeletal muscle actomyosin has been investigated in this work. It has been shown that most changes of Mg2+, Ca(2+)-ATPase activity are observed under 0.2 and 0.4 W/cm2 continuous ultrasound. K(+)-ATPase activity is inhibited by continuous ultrasound of all intensities studied. Impulsive 2 and 10 ms ultrasound did not change the Mg2+,Ca(2+)-ATPase activity. While K(+)-activity is reliably changed only under impulsive 0.7 and 1.0 W/cm2 ultrasound that can be explained by the thermal effect. It has been determined, when studying the reconstructed actomyosin with sound troponin complex, that troponin complex is the most ultrasound sensitive constituent of actomyosin.