Body heat during exercise
Oxygen consumption by the body can be increased up to 20 times in well-trained athletes and the amount of heat released in the body is almost proportional to oxygen consumption, a large amount of heat is taken internally. tissues of the body.
Almost all the energy released by the body's metabolism of nutrients is eventually converted into body heat. This applies even to muscle contraction energy for the following reasons: First, the maximum efficiency for converting nutritional energy into muscle work, even under the best conditions, is only 20 - 25%; The remaining nutritional energy is converted to heat during chemical reactions in the cell. Second, almost all the energy for muscle activity still becomes body heat because all but a small part of this energy is used for (1) overcoming resistance to the movement of the body. muscles and joints, (2) overcoming the frictional force of blood flowing through the blood vessels, and (3) other, similar effects, all of which convert muscle contraction energy into heat.
It is now recognized that oxygen consumption by the body can be increased up to 20 times in well-trained athletes and that the amount of heat released in the body is approximately proportional to oxygen consumption, rapidly receiving oxygen. found that large amounts of heat are injected into the internal tissues of the body during endurance sporting events. Next, with a large proportion of heat flow into the body on very hot and humid days, it prevents the sweating mechanism to remove heat, causing an uncomfortable and even deadly condition called heatstroke. seen in athletes.
Drunk hot. In endurance sports, even under normal environmental conditions, body temperature typically rises from the normal range of 98.6°F to 102°F or 103°F (37°C to 40°C). With very hot and humid conditions or excessive clothing, body temperature can easily rise to 106F to 108°F (41°C to 42°C). At this level, the high temperature destroys tissue cells, especially brain cells. When this happens, a variety of symptoms begin to appear, including weakness, fatigue, headache, dizziness, nausea, sweating, confusion, unsteady gait, falls, and weakness. the provincial.
This whole complex is known as heatstroke, and if not treated immediately can lead to death. In fact, even though a person has stopped exercising, the temperature does not drop easily on its own, partly because at high temperatures, the thermoregulatory mechanism often fails. The second reason is that in heatstroke, the very high body temperature doubles the rate of chemical reactions in the cells, thereby releasing even more heat.
Treatment of heatstroke is to lower body temperature as quickly as possible. The most practical way to reduce body temperature is to remove all clothing, maintain a spray of cool water on all surfaces of the body or continuously wipe, and blow air over the body with a fan. Experiments have shown that this treatment can bring down the temperature either as quickly or almost as quickly as any other procedure, although some doctors prefer to immerse the whole body in water containing ice. cells if any.