Humans are very thermoregulated animals.
So why do you suffer from heat stroke? This is due to the fact that people are very good at regulating body temperature. The reason for this contradictory statement will be described later, but in considering this, the concept of core body temperature becomes very important. Humans are homeothermic animals and are called endothermal animals. Generally, an internal temperature animal refers to an animal that can maintain a high temperature inside the body (deep body temperature) by the heat generated by itself. Endothermic animals generally have a large body size, which means that they have the ability to maintain a constant core body temperature despite environmental temperature changes. On the other hand, small-sized animals are classified as so-called external temperature animals whose core body temperature changes depending on the environmental temperature.
Human body temperature regulation. A person that is both a constant temperature animal and an internal temperature animal can be said to have excellent thermoregulatory ability independent of the environment. However, excessive heat production and excessive environmental temperature increase due to strenuous exercise can increase core body temperature. Many animals prevent core body temperature rise by stopping exercise. Avoid crisis by escaping into the shade or the water. But what about people? It is a very patient creature that keeps exercising even when it is hot and doing hard work hard. This patience is because people have a very good thermoregulatory system-sweating. Sweating removes large amounts of heat from the body by evaporating sweat (vaporization). This allows you to exercise even in an environment that is above your core body temperature.
Limit of sweating. Sweating is an excellent thermoregulatory mechanism. But there are limitations. Dehydration reduces sweating. Also, before that, sweating is a reaction that uses energy. No matter how much water you drink, you will not endlessly sweat. Excessive sweating causes sweating fatigue. Even bigger problems are humidity and clothing issues. Sweat is useless if it does not evaporate, so in high-humidity or clothing that does not evaporate sweat, core body temperature will continue to rise. In other words, overconfidence in sweat can lead to heatstroke. However, it seems difficult to take measures to completely stop exercise and work in a hot environment.
Monitoring the core body temperature, which is a strong breakwater, is very important to protect humans from health problems in workplaces and exercise sites where there is a risk of heat stroke.