17 college-age subjects performed two 20-min. runs at 65% of maximal oxygen consumption. Randomized trials were conducted with an external nasal dilator strip or without. Subjects were polled every 5 min. for over-all rating of perceived exertion, central rating of perceived exertion, and local rating of perceived exertion. The use of an external nasal dilator strip did not significantly lower any of the three.
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