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The purpose of this study was to examine the changes of trait anxiety and its related physiological variables in obese women through chronic exercise. A total of twenty three college female students having over 30% of body fat were equally assigned to an experimental group or a control group. The experimental group lasted aerobic exercise for 40 minutes a day, 3 times per week for 10 weeks. Their exercise intensity was 50% to 70% of VO₂max. An independent t-test using each group's gain scores showed that changes of the trait anxiety(p<.05), body fat(p<.01), and VO₂max(p<.05) were significantly different from those of the control group. There were, however, no significant differences between the two groups in the changes of the blood pressure and the recovery heart rates. It was concluded that chronic exercise can lower trait anxiety in obese women. However, the decreased trait anxiety seems to be independently associated with blood pressure changes.