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The aim of this study was to investigate the effect of aquarobics on metabolic syndrome risk factors in middle aged women. 18 obese women participated in this study and divided into 2 groups(aquarobics group: n=10; control group, n=8). Body composition, blood lipids, fasting blood glucose, and blood pressure were measured to compare the changes. The aquarobics for experimental group consisted of 10 minutes of warm up, 40 minutes of main workout, and 10 minutes of cool-down with 70% HRmax and 3time/week frequency. For data analysis, mean and standard deviation scores were calculated, and repeated two way ANOVA were used. As s results, weight(p<.05), %body fat(p<.01), BMI(p<.001), and WHR(p<.05) showed significant interactions in body composition. In blood variables, TC(p<.05), LDL-C(p<.05) and fasting blood glucose(p<.05) showed significant interaction. However, no interaction was shown in both systolic and diastolic blood pressure. In conclusion, 12weeks of aquarobics training confirms the positive effect on metabolic syndrome risk factors of middle aged women.