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The purpose of the study was to ascertain whether or not an acute moderate exercise before competition reduces the competitive state anxiety of athletes and elicits positive affection from them. Twenty male table tennis players were randomly divided into experimental group(n=7) and control group(n=7). each of the experimental group with remote cardiometer performed ten-minute running to set the intensity of acute moderate exercise. Mean heart rate and standard deviation were 139.09±5.31. Left-handed subjects and outliers over ±2 SD were excluded in EEG result analysis. The experimental group was measured by EEG and CSAI-II immediately after 10 minutes running. The results of this study were as followings. First, the cognitive state anxiety was not reduced significantly but the somatic state anxiety was significantly reduced in comparison with the control group. Second, self-confidence in the experimental group was enhanced compared to the control group. Third, somatic anxiety (r=-.95, p<.01) and self-confidence (r=.78, p<.01) revealed significant correlations with αspectral power density. The results of this study provided an indication that acute moderate exercise does effect both somatic state anxiety and self-confidence.