A comparative study of the effect of continuous and impulsive (2 ms) ultrasound regimes on actomyosin superprecipitation reaction of the rabbit skeletal muscles was carried out. From the obtained kinetic curves the value of superprecipitation (D(m) - D(00)), time t1/2, which required to achieve a half its value was determined, and the normalized maximal rate of this reaction V(n) was calculated as well. It is shown that continuous ultrasound with intensities 0.7 W/cm2 and impulsive ultrasound--of 0.4 W/cm2 produced the most pronounced effect (value of superprecipitation and V(n) were maximal). The actomyosin superprecipitation value under continuous and impulsive ultrasound with intensity 1 W/cm2 relative to control and all other applied intensities was most decreased. It is caused perhaps thermal influence of the ultrasound. Thus the obtained data give every reason to assume, that impulsive ultrasound causes changes of adaptive character in actomyosin because the interrupted regime of the ultrasound signal.
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