What is the core feature of heat stress?

The core feature of heat stress is high core temperature. This condition occurs when the body is unable to dissipate heat effectively, leading to an increase in central body temperature that can exceed normal physiological limits.

When the body is exposed to high temperatures, particularly in conjunction with high humidity, it may struggle to maintain its thermal homeostasis. The hypothalamus, which regulates body temperature, becomes overwhelmed, and thermoregulatory mechanisms like perspiration and increased blood flow to the skin can become insufficient to cool the body down. As a result, the core temperature rises, which can lead to various heat-related illnesses, such as heat exhaustion and heat stroke.

While low blood pressure, increased respiration rate, and loss of consciousness can be associated with heat stress, they are secondary effects that arise from the primary issue of elevated core temperature. For example, as body temperature rises, it can lead to dehydration, which may reduce blood volume and consequently cause low blood pressure. Similarly, increased respiration rate can occur as the body attempts to cool itself and compensate for metabolic demands, while loss of consciousness may result from severe overheating affecting brain function. However, the hallmark of heat stress itself is indeed the elevated core temperature.