There are a number of studies which have utilised exercise protocols where subjects are free to vary the work rate rather than having it externally imposed as is the case in fixed intensity exercise. These studies have demonstrated that exercise performance is regulated in advance of an excessive rise in body temperature when exercising in the heat. The evidence from self-paced exercise studies indicates that exercise in the heat is regulated specifically to control the metabolic rate, thereby ensuring that the exercise bout can be completed before thermal injury can occur. The findings from studies utilising different exercise modalities (fixed intensity vs. self-paced) have produced an alternative hypothesis explaining exercise regulation.
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