Hydration
Why do you sweat when you exercise?
To exercise, you need to move your muscles, and to move your muscles, you need energy.
Approximately 20% of the energy generated in the body during exercise is used for exercise energy, but the rest is all converted to heat.When exercising for a long period of time, this heat spreads throughout the body from the moving muscles, raising the body temperature throughout the body (it is said that the temperature rises to a maximum of 42.0°C).For this reason, our bodies are equipped with various protective functions for temperature regulation so that our body temperature does not rise excessively.A typical example is “sweating”.
"Sweat" is the water secreted from the sweat glands on the surface of the skin (there are 200-500 million in the body).Sweating occurs not only when the body temperature rises due to exercise, but also when the environmental temperature (the temperature of the air around us) rises.
When the temperature is high but the humidity is low, sweat evaporates and draws heat from the skin to regulate body temperature. It will not cool well.In addition, when sweat drips down, "dehydration" is likely to occur, and "blood concentration" occurs.This puts a strain on the heart and blood vessels, and the lack of blood flow to the internal organs and brain makes it impossible to restore normal body temperature.This is called "heatstroke" and can cause severe symptoms such as unconsciousness.
It is important to replenish water when exercising for a long time, such as marathons, or in hot and humid environments such as in the summer, when you sweat a lot and are prone to heatstroke.
