Heat Stress
Heat stress is a physiological condition that occurs when the body’s core temperature rises to dangerous levels due to prolonged exposure to high environmental temperatures. This develops when heat gain from the environment or metabolic activity exceeds the body’s capacity to dissipate it through sweating and vasodilation. Under normal conditions, these cooling mechanisms maintain core temperature within a narrow range essential for organ function and survival.
Causes and Risk Factors
Heat stress arises from prolonged exposure to high ambient temperatures, particularly when combined with high humidity that impairs sweat evaporation. Physical exertion in hot environments, inadequate hydration, and certain medications can elevate risk. Vulnerable populations include outdoor workers, athletes, young children, elderly individuals, and those with cardiovascular or metabolic conditions.
Effects and Symptoms
As core temperature rises, the body experiences progressive dysfunction. Early signs include excessive sweating, weakness, dizziness, and nausea. Continued heat stress can lead to heat exhaustion—characterized by profuse sweating, rapid heartbeat, and potential loss of consciousness—or heat stroke, a medical emergency involving confusion, cessation of sweating, and organ damage. Chronic heat stress exposure carries risks of long-term complications including kidney dysfunction and heat-related illness recurrence.
Prevention and Management
Heat stress is prevented through adequate hydration, limiting exposure during peak temperatures, wearing appropriate clothing, and allowing acclimatization periods for physical activity in heat. Treatment involves removing the person from the heat source, cooling the body through water immersion or evaporative methods, and rehydration. Severe cases require emergency medical intervention.