The state of body systems during physical activity – How
If we trace the activity of each of the functional systems of the body, you will notice that when you perform physical work they are exposed to many natural changes, and these changes are adaptive in nature.
If we trace the activity of each of the functional systems of the body,
you will notice that when you perform physical work they are exposed to many natural changes, and these changes are adaptive in nature.
Adaptation of the body during muscular work is primarily aimed at ensuring the constancy of the internal environment – homeostasis.
Functions in our body normally occur only at a constant temperature of the body. During physical work, the body temperature rises the more, the more intense and longer work. At light work, for example when walking, moderate intensity, it increases by 0.5-0.6 ° C, whereas after a long and intense run – up to 39-40 ° C.
Systematic exercise increase the adaptation of the body to overheat. Physical exercises develop equally as the mechanism of chemical and physical thermoregulation. In trained men during exercise is significantly better than untrained, improves heat transfer through the skin due to the greater detection of capillaries. To the skin it increases the flow of warm blood, its temperature rises, and therefore decreasing these methods of heat transfer, radiation, conduction and evaporation.
A vivid example of the adaptation of thermoregulatory mechanisms to physical activity is that during intense muscular activity increases the heat loss by evaporation and decreases the excretion of water by the kidneys. The biological value of this mechanism of regulation of secretory processes characterized by increased blood flow to working muscles and skin, and also to the kidneys as their function certain time may be replaced by a work of sweat glands.
Body cells normally operate only at a relatively constant osmotic pressure, which is determined by the constant content of electrolytes and water. During intense and prolonged physical work, especially at high temperatures, the human body in 1 hour can lose more than 1 liter of sweat, and with it washed out to 3-5 g of salt. Long-term and significant sweating leads to the violation of water-salt balance. In these conditions, muscle functionality, without reducing its intensity may only continue a body that is well adapted to a sharp increase in the osmotic pressure.