[Tropomyosin metabolism in muscles and its blood levels during physical exertion].

Physical exercise induces phasic changes in the tropomyosin content and metabolism in muscles and its concentration in blood. The intensive catabolic processes (decrease of 14C-leicin inclusion and time of half-life) of muscle tropomyosin and its appearance in blood were shown 2-24 hours after the exercise. Intensive anabolic processes of muscle tropomyosin were found at the late period of rest (72-144 h).

[Effect of physical exercise on myoglobin and tropomyosin levels in skeletal muscles and myoglobin level in rat blood].

Single intensive physical exercise caused phase alterations in content of myoglobin and tropomyosin in rat skeletal muscles. Within the first 2-4 hrs of rest concentration of myoglobin and tropomyosin was decreased in muscles by 40-50% (catabolic, urgent step of adaptation). Within the later period of rest (72-120 hrs) content of myoglobin and tropomyosin was increased by 25-30% (anabolic, later step of adaptation) as compared with the control level.

[Effect of exertion on the tropomyosin level in rat skeletal muscles].

It is established that the content of tropomyosin in skeletal muscles of rats increases due to the action of the systematic physical exercises of the speed-force direction. Suprareduction of tropomyosin in remote periods of rest after a single load is a biochemical basis of this process.