K. O. Medynska, N. Ye. Nurishchenko, L. I. Pelyukh, O. V. Shelyuk

Taras Shevchenko Kyiv National University;
Educational and Scientific Centre “Institute of Biology”, Ukraine;
e-mail: medinkat@ukr.net

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⁺,Ca²⁺-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⁺,Ca²⁺-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.

Keywords: actomyosin complex, ATPase activity, skeletal muscle, ultrasound