Actual Mechanism of Heat Loss during Exercise
Actual Mechanism of Heat Loss during Exercise
High heat and humidity reduce body’s ability to lose heat by radiation or convection and evaporation. While exercising, the heat production within muscle and it is transfer from the core to the skin. Under appropriate environmental conditions, excess body heat dissipates to the environment which regulates the core temperature within a narrow range. During exercise in the heat, the heat loss mechanisms compete with the active muscles for more of the limited blood volume. Thus, neither area is adequately supplied under extreme conditions.
Heat conduction is when the heat transferred from one material to another through direct molecular contact. Heat generated deep in the body can be conducted through adjacent tissue until it reaches your body’s surface. It can be conducted to clothing or to the air that is in direct contact with the skin.
Heat convection involves moving the heat from one place to another by the motion of a gas or a liquid across the heated surface. We are not always aware of it but the air is in constant motion. As the air circulates, passing over the skin, it sweeps away the air molecules that have been warmed by their contact with the skin. The greater the movement of the air, the greater the rate of heat removal by convection. When combine with conduction, convection can constantly remove body heat when the temperature is lower than skin temperature.
Radiation also plays a role in the body heat excess. The skin constantly radiates heat in all directions to the objects around it such as clothing, furniture and walls but also can receive radiational heat from surrounding objects that are warmer. If the temperature of the surrounding objects is greater than the skin, body will experience a net heat gain via radiation.
Evaporation is the primary avenue for heat dissipation during exercise. As fluid evaporates, heat is lost. Evaporation accounts for about 80% of the total heat loss when
High heat and humidity reduce body’s ability to lose heat by radiation or convection and evaporation. While exercising, the heat production within muscle and it is transfer from the core to the skin. Under appropriate environmental conditions, excess body heat dissipates to the environment which regulates the core temperature within a narrow range. During exercise in the heat, the heat loss mechanisms compete with the active muscles for more of the limited blood volume. Thus, neither area is adequately supplied under extreme conditions.
Heat conduction is when the heat transferred from one material to another through direct molecular contact. Heat generated deep in the body can be conducted through adjacent tissue until it reaches your body’s surface. It can be conducted to clothing or to the air that is in direct contact with the skin.
Heat convection involves moving the heat from one place to another by the motion of a gas or a liquid across the heated surface. We are not always aware of it but the air is in constant motion. As the air circulates, passing over the skin, it sweeps away the air molecules that have been warmed by their contact with the skin. The greater the movement of the air, the greater the rate of heat removal by convection. When combine with conduction, convection can constantly remove body heat when the temperature is lower than skin temperature.
Radiation also plays a role in the body heat excess. The skin constantly radiates heat in all directions to the objects around it such as clothing, furniture and walls but also can receive radiational heat from surrounding objects that are warmer. If the temperature of the surrounding objects is greater than the skin, body will experience a net heat gain via radiation.
Evaporation is the primary avenue for heat dissipation during exercise. As fluid evaporates, heat is lost. Evaporation accounts for about 80% of the total heat loss when