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Purpose : The purpose of this study was to compare the effects of modality and exercise therapy on delayed onset muscle soreness. Method: Subjects were assigned to 18 male and female(ultrasound group: 6 , stretching : 6, control group : 6) at random. Ultrasound was treated insertion of quadriceps frequency: 1MHz, Strength: 1.5 / ㎠, Time: 10 minutes. Stretching, active stretching, was repeated total 10 times and 30 seconds in duration on hip flexion which is opposite effect of quadriceps and knee flexion in a prone position. All of data calculated average and standard deviation and analyzed to investigate the effects within ultrasound therapy and stretching group using repeat measured ANOVA, one-way ANOVA and LSD. Result : Ultrasound and stretching group was not represented to statistically significant difference between groups. Conclusion : Ultrasound group showed that the effects on MMT, PPT, ROM, VAS in differences in group by time interaction but ultrasound and stretching group was not represented to statistically significant difference between groups.