The Effect Of 12 Week Speed Change Walking On Bone Mineral Density And Body Composition Of Postmenopausal Women

Objective: In recent years,it has become a hot topic to explore the effect of exercise intervention on the prevention and treatment of osteoporosis,which is mainly manifested by the decrease of bone strength and the increase of fracture risk.With the aging of the population in China,osteoporosis patients are increasing year by year.In this study,42 postmenopausal women in Xi'an City,Shaanxi Province were selected as the experimental subjects through health examination and questionnaire survey.The subjects were intervened with 12 weeks of variable speed walking exercise,and the changes of bone density and body composition indexes before and after exercise were compared and analyzed.The purpose of the analysis is to provide scientific basis for women's sports after menopause.Methods: 42 subjects were randomly divided into three groups: control group,constant speed group and variable speed group.Four times a week were conducted in the constant speed group and the variable speed group,each time the constant speed group must reach 35-59% of the maximum heart rate and the target heart rate 56-95 times / min;the variable speed group must reach 60-79% of the maximum heart rate and the target heart rate 96-126 times / min to maintain this intensity for 30 minutes,a12 week exercise intervention.During the exercise,the subjects' heart rate,walking speed and subjective exercise intensity were combined to control the exercise load.Before and after the experiment,the fat content,muscle content,tissue content,fat removal content,bone mineral content,BMD,BMC,area and other eight indexes of the subjects were tested.Results: 1.After 12 weeks of walking exercise,there was a significant difference in the content of mineral bone between the two groups(P < 0.01).There were significant differences in muscle content,tissue content and fat removal content in the upper limbs(P < 0.05),in the lower limbs(P < 0.01),in the whole body composition changes,there were significant differences in muscle content and tissue content(P <0.05),and in fat removal content(P < 0.01).However,the total amount is on the rise.There were significant differences in muscle content,tissue content and fat free content in upper limbs(P < 0.01),tissue content in lower limbs(P < 0.01),muscle content and fat free content(P < 0.05),and tissue content in whole body composition(P < 0.05)Significant(P < 0.01).The fat content of the constant speed group and the variable speed group was significantly higher than that before the intervention.Although they did not reduce the body fat content of the subjects,they made beneficial changes in body composition.2.The difference of BMD and BMC between the uniform speed group and the variable speed group was significant(P < 0.01).The area of the variable speed group was significantly different from that before the intervention(P < 0.01).There was no significant change(P > 0.05)in the area of upper limbs in the uniform speed group,but the overall trend was upward.Conclusion: 1.After 12 weeks of variable speed walking exercise intervention,it can significantly improve the indexes of bone mineral content and muscle content in the body composition of postmenopausal women,effectively improve the bone density of the population,and achieve the purpose of reducing fat,strengthening bone and preventing osteoporosis.2.The body composition and bone mineral density of postmenopausal women can also be improved after 12 weeks of walking exercise.However,the study shows that the improvement effect of the variable speed group is more obvious than that of the uniform speed group.