n International SportMed Journal - Exercise and fatigue-control mechanisms




The relationship among fatigue, intensity of effort, and pacing strategies during exercise has not been conclusively defined. The article describes 3 models of fatigue. In the first, the peripheral model, muscle metabolic factors control or dictate the onset of fatigue and the reduction or termination of exercise. In the second model, the central-teleoanticipatory model, subconscious-brain centers or functional activities set predetermined exercise activity in a feedforward manner, maintaining a reserve of functional capacity as a protective mechanism. In the third model, the cognitive-discussion model, the sensation of fatigue itself controls exercise intensity in a feedforward manner within the framework of the subconscious teleoanticipation limits, using prior activity as the comparator to set and maintain levels of exercise intensity. Physiological and anatomical structures available in the latter 2 models to control exercise intensity might include central pattern generators, multiple-joint spatial-pattern recruitment, and motor-unit-recruitment variation.


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