Effect of hyperthermia on women quadricep's adaptation during the isometric strain and cardiovascular system

Temperature is important for muscle function. Muscle contraction and relaxation becomes quicker, development of power increasing as the temperature of the body raises. Immoderate temperature of the muscle, as a result, can decrease physical efficiency. Increased body temperature affects the nerve impulses, transmitted to brains, sweating level and also activates the blood circulation process. Hyperthermia is a limiting factor during the physical load on muscles. Large variations in temperature can cause changes in maximal voluntary force. High rectal temperature (higher than 40ºC) may negatively affect the central nervous system and the thermal emission of the body. Heating affects the skin and superficial layers of human body. Optimal temperature of water in which the muscle is placed during the study is about 45 ºC, because the higher temperature may cause the degradation processes of the proteins. Increased body temperature reduces the metabolism and the activity of the skeletal muscle, which causes the fatigue. Hypothesis: We think that the effect of passive hyperthermia increases the muscle resistance to the fatigue and the increase of the isometric strain. Objective of this research is to explore the effect of passive hyperthermia on women quadriceps adaptation to the isometric strain and cardiovascular system. The experimental group 6 females: age average 21.5 ± 1.6 y. The research consisted of two stages: During the first stage volunteers were tested in the basic muscle conditions. On the second stage, which endured for two weeks was the heating of the muscle performed. There were the maximal voluntary and involuntary forces of the women’s quadriceps measured using the electric stimulation of the 1, 10, d10, 20, 50, 100 Hz. The changes in cardiovascular system during the passive hyperthermia where watched. Also the rectal, skin and medium temperatures were measured. The results show that after the two weeks time passive hyperthermia, the force of the women quadriceps during the isometric strain, the maximal voluntary force is less than during the basic muscle conditions. Muscle adaptation to the passive hyperthermia has decreased the fatigue and increased the muscle recovery after the 5 minutes time strain did not show any changes and the muscle fatigue has decreased. The effect of heating has decreased the H and the DBP (distole blood preassure). The SBP (sistol blood press) are remained unchanged. The inner body temperature and the thermal stress had decreased after the heating