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Exercise is of benefit to many aspects of health, but exhaustive exercise above specific intensity seems to be related to the some side effect of exercise. Therefore, the purpose of this study is to examine the effects of various exercise intensities on the change of stress hormones. Particularly, we intend to apply the same volumes of exercise to examine only the pure effects of exercise intensity. 7 healthy young males(age : 25.6±1.5, O2max: 56.0±2.7 ml/kg/min) participated in four trials. At each trial, subjects ran on the treadmill at the respective intensities corresponding to 50%, 65%, 75%, 85% of O2max. They exercised for different duration so that energy expenditure was equal to all subjects(400kcal). The order of the trials was randomized and separated by one week. Blood was obtained at rest, immediately after exercise, and at 90 min after exercise to measure epinephrine, norepinephrine, and cortisol.The concentration of catecholamine was increased immediately after exercise more than baseline level(epinephrine: p<.05, norepinephrine: p<.01) and norepinephrine was decreased at recovery 90 min more than immediately after exercise at 75% and 85% of O2max. In the effect of exercise intensity, the concentration of norepinephrine at 85% intensity was higher than those at 50%, 65% intensities immediately after exercise. Cortisol level at 85% intensity was higher than those at other intensities.In conclusion, the concentrations of norepinephrine and cortisol were affected by exercise intensities and at the 85% of VO2max, the concentrations was higher than any other intensities.