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The purpose of this study was to investigate the effects of carbohydrate substrate availability on ratings of perceived exertion (RPE) during prolonged submaximal running. Thirty marathon runners were recruited as subjects. A double-blind study design was used in which subjects performed an experimental trial that consisted of a 2.5-hr treadmill run at 75–80%
A. Utter and D. Nieman are with the Department of Health, Leisure, and Exercise Science, Appalachian State University, Boone, NC 28608. J. Kang is with the Departement of Health and Exercise Science, Rowan College of New Jersey, Galssboro, NJ 08028. B. Warren is with the Department of Physical Education and Exercise Science, Lander University, Greenwood, SC 29649.