What happens to a marathon runner's core temperature regulation if they primarily consume sports drinks with high carbohydrate concentrations during the race, but neglect sufficient water intake?

💡 Explanation

High carbohydrate drinks, without enough water, cause increased osmotic pressure, drawing water from the bloodstream into the gut. This reduces the sweat rate and impairs evaporative cooling because of the resulting dehydration; therefore, heat dissipation is impaired, rather than improved electrolyte balance or sweat rate.

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