When are athletes at greatest risk of exertional heat illness (EHI)?

When are athletes at greatest risk of exertional heat illness (EHI)?

• A. The first 2-3 weeks of preseason in equipment-intensive sports
• B. The last week of the season
• C. Off-season with no training
• D. Postseason in cool climates

Answer: (A)

The main idea is that exertional heat illness risk is highest when athletes are just beginning heat exposure and are wearing gear that traps heat. In the first 2–3 weeks of preseason for equipment-heavy sports, players haven’t yet acclimated to the heat and the body is still adjusting to the added heat load from both intense training and protective equipment. Heat acclimatization brings important adaptations—sweat rate increases, plasma volume expands, and cardiovascular efficiency improves—that help keep core temperature lower during exercise. If practices are frequent and intense before these adaptations are in place, metabolic heat production from the activity can outpace the body’s cooling mechanisms, leading to heat strain or more serious heat illness. The gear itself amplifies this risk by increasing insulation and reducing evaporative cooling, making it harder to shed heat even as work rate remains high. Because of this combination, the earliest preseason period is when athletes are most vulnerable, and implementing a structured heat-acclimatization plan, paying close attention to hydration, and adjusting practice conditions is crucial. In contrast, later in the season or during cooler conditions, athletes are typically more acclimated and the environmental and equipment-related heat burden is reduced, lowering the risk.

The main idea is that exertional heat illness risk is highest when athletes are just beginning heat exposure and are wearing gear that traps heat. In the first 2–3 weeks of preseason for equipment-heavy sports, players haven’t yet acclimated to the heat and the body is still adjusting to the added heat load from both intense training and protective equipment. Heat acclimatization brings important adaptations—sweat rate increases, plasma volume expands, and cardiovascular efficiency improves—that help keep core temperature lower during exercise. If practices are frequent and intense before these adaptations are in place, metabolic heat production from the activity can outpace the body’s cooling mechanisms, leading to heat strain or more serious heat illness. The gear itself amplifies this risk by increasing insulation and reducing evaporative cooling, making it harder to shed heat even as work rate remains high. Because of this combination, the earliest preseason period is when athletes are most vulnerable, and implementing a structured heat-acclimatization plan, paying close attention to hydration, and adjusting practice conditions is crucial. In contrast, later in the season or during cooler conditions, athletes are typically more acclimated and the environmental and equipment-related heat burden is reduced, lowering the risk.