(School of Physical Education,Wenzhou Medical College,Wenzhou 325035,China) Abstract: In order to observe the effects of Yoga exercise on the uterine blood flow and endometrial secretions PGF2α, PGE2 and AVP of female college students suffering primary dysmenorrhea during their menstrual periods, and to probe into the mechanism of dysmenorrheal symptom improvement made by Yoga exercise, the authors di-vided 20 female college students, who had been diagnosed as having primary dysmenorrhea by doctors, randomly into 2 groups, namely, an experiment group which contained 11 female college students and a control group which contained 9 female college students, let the testees in the experiment group do the Yoga exercise for 3 months, 3 times per week, 1 hour per time, while the testees in the control group did not do the Yoga exercise, before the ex-periment, after 2 months of experiment, and after 3 months of experiment, used a color Doppler ultrasound instrument to measure the changing of the resistance index (RI), pulsation index (PI) and ratio of peak systolic blood flow to peak diastolic blood flow (S/D) of the uterine and arcuate arteries of the testees within 24 hours after menses, applied the ELISA method to measure the PGF2α, PGE2 and AVP concentrations of menstrual blood, used a dysmenorrheal symptom evaluation form to evaluate the degree of menstrual pain before and after the experiment, and revealed the following findings: after 3 months of exercising, the S/D, RI and PI of the arcuate artery and the S/D and RI of the uterine artery and the degree of pain of the testees in the experiment group were all lower than those measured be-fore the experiment (P<0.05), in which the RI of the arcuate and uterine arteries and the degree of pain of the testees in the experiment group were significantly lower than those of the testees in the control group (P<0.05); the ratio of PGF2α to PGE2 and AVP concentration of menstrual blood of the testees in the experiment group were significantly lower than those of the testees in the control group (P<0.05). The said findings indicated the followings: Yoga exer-cise can lower the resistance of blood flow in uterine blood vessels, improve uterine blood circulation, and help al-leviate dysmenorrheal symptoms; its working mechanism may be related to the lowering of uterine secretion AVP and ratio of PGF2α to PGE2 of the sufferers. Key words: sports medicine;primary dysmenorrhea;uterine blood flow;prostaglandin;arginine vasopressin;Yoga |