Heat stress reduces a person's ability to achieve maximal metabolic rates during exercise.
Heat stress increases the total metabolic rate and anaerobic participation during submaximal exercise, and these increases are somewhat abated by heat acclimatization.
Exercise-heat stress reduces hepatic blood flow and increases hepatic glucose release.
Individuals routinely have sweating rates of 1 liter per hour when working in hot environments.
Dehydration from sweat loss increases plasma tonicity and decreases blood volume, both of which reduce heat loss and result in elevated core temperature levels during exercise-heat stress.
During exercise-heat stress, competing metabolic and thermoregulatory demands for blood flow make it difficult to maintain an adequate cardiac output.
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