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The Gastrointestinal System

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Exercise Physiology

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Abstract

During prolonged exercise, the loss of fluid and electrolytes in sweat, together with the depletion of energy stores in the liver and working skeletal muscles, can produce dehydration, hyperthermia, hyponatremia, hypoglycemia, and glycogen depletion. Any one of these factors could contribute to fatigue and limit physical performance. These effects are exacerbated when exercise is performed in the heat. The magnitude of the alterations can be substantial but they are highly variable among individuals. Sweat losses can range from 1 to 4 1•h−1 and sodium losses from 10 to 120 mEq • 1−1 of sweat. Exogenous carbohydrate utilization can exceed 1 g • min−1.

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  1. Carl V. Gisolfi
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  1. Department of Physiology, University of Arizona, Tucson, Arizona, USA

    Charles M. Tipton Ph.D.

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Gisolfi, C.V. (2003). The Gastrointestinal System. In: Tipton, C.M. (eds) Exercise Physiology. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-7543-9_12

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