The influence of the pool length on physiological and perceptual effects was studied by comparing heart rate (HR), oxygen uptake (VO2), and rating of perceived exertion (RPE) while swimming at the same speed. Ten trained university swimmers swam the crawl stroke with 2 kinds of breathing pattern in lanes of fifty meters, twenty five meters, and fifteen meters. The VO2-HR relation was obtained during submaximal and maximal work in tethered crawl swimming. The result was that in the case of both normal breathing and controlled breathing, physiological exercise intensity (HR, VO2) and perceptual exercise intensity (RPE) significantly decreased with the decrease in the length of the swimming lane.
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