The purpose of this study was to determine if subjects are able to select their exercise intensity by perceptual feelings it may be possible to supplement the exercise prescription by running. Fifteen subjects, 12 female and 3 male, took part in this study. The exercise trials were each 6 minutes duration on a level treadmill.
　Ex. I: Subjects were exercised at three different speeds, presented in randomized order. Heart rate (HR), Oxygen uptake (VO₂) and ratings of perceived exertion (RPE) were measured during the last 5-6 minute of exercise.
　Ex. II: On a separate day, subjects were requested to subjectively select their own treadmill speed at randomly presented three RPE values, 9, 13 and 17. VO₂, HR and speed were measured during the last 5-6 minute of exercise.
　The results indicated that the good linearity and high correlations (r) between RPE values and HR and %VO₂ max at Ex. I (0.844 and 0.875) and Ex. II (0.777 and 0.872), respectively. The r-values were significant at the 0.01 level. There were no differences in the relation of RPE-%VO₂ max and RPE-HR between the two experiments.
　It is concluded that subjectively select of exercise intensity by RPE may be acceptable to use exercise prescription by running.

DESCENTE SPORTS SCIENCE Vol.9/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE