Abstract

The aim of the research was to identify the dynamics of muscle function’s recovery after physical exercise eliciting metabolic fatigue and muscle mechanical injury simultaneously (5 series of 20 jumps performed at maximal intensity every 10 s). The testees were healthy, inactively engaged in sport men (18-20 years old) (n = 11). The results of the research showed that after jumping endurance exercise lactate concentration in the blood significantly (p < 0.05) increased, the height of vertical jump, maximal voluntary force and the force caused by all (low and high) stimulation frequencies (except the force caused by high stimulation frequencies – 50 and 100 Hz – and registered when the muscle is long) decreased. In addition, the force elicited by electrostimulation (especially the one caused by low stimulation frequencies – 1-20 Hz – with short muscle length) significantly reduced during the muscle recovery after exercise (instead of the expected rise). The increase of creatinkynasis and muscle pain 24 hours after exercise shows that jumping endurance exercise mechanically injured the muscles. The results of our research proved the hypothesis that performing intensive physical jumping endurance exercises a 2-type fatigue results in the muscles – metabolic and nonmetabolic (linked with muscle mechanical injury) and the process of potentiation initiates assistance in recovering after muscle fatigue. The dynamics of muscle recovery after exercise may be explained by this 2-type fatigue, the dynamics of potential processes as well as the sensitivity of muscle functional qualities to these factors. Verf.-Referat