The Time Course Of Exercise Intervention In 55 To 65 Aged Sedentary Women

Objective:Regular exercise can reduce the adverse effects of the aging process, and it also can delay the development of chronic diseases and disability factors, finally improve the quality of life. Our research aims to observe 3-month exercise intervention,6-month exercise intervention and 3-month detraining of different types of exercise on effect of physical fitness in middle-aged and older women, then find out the time course of the changes.Methods:115 aged from 55 to 65 female volunteers were recruided from the nearby community, they were random divided into normal group (C group, n=12), walking group (W group, n=36), low volume running group (LR group, n=13) and high volume running group(HR group, n=15), Tai Chi group(T group, n=24) and squar dance group(SD group, n=15). All the volunteers had finished 6-month exercise intervention. After 3-month and 6-month exercise intervention and 3-month detraining, we assessed the morphology indexes, the metabliv indexes, the echcardiography and pulmonary functions, the cardiorespiratory fitness and other indicators of health.Results:(1)After 3-month exercise intervention, the stride length, vital capacity, V02max, V02AT, VO2RCP, quiet heart rate, LDL-C were obviously improved, and the changes of the great amount running group was more obvious in 55 to 65 years old sedentary female volunteers. (2)After 6-month exercise intervention, the stride length, body weight, vital capacity, V02AT, VO2RCP, quiet heart rate, TC, HDL-C, heart rate and blood pressure in the 50%-60% VO2max strength movement has improved significantly, the changes of the tai chi group was more obvious in 55 to 65 years old sedentary female volunteers. (3)After 3-month detraining, the benefits of the stride length、VO2max,50%-60% V02max of heart rate and blood pressure were stable in all types of exercise. The health benefits of the heart rate and vital capacity were relatively stable in the walking group and tai chi group in 55 to 65 years old sedentary female volunteers. (4)The recommended minimum movement and its half amount of exercise intervention from United States Public Health Service, the stride length, vital capacity and V02max were significantly increased after 3-month intervention, and all these could still keep for a long time after 3-month detraining.Conclusions:(1)The recommended minimum amount of exercise intervention (1080—1296 kcal/wk) after 3 to 6 months can improve the stride length, cardiorespiratory fitness and blood lipid, and it can still keep for a long time after 3-month detraining in 55 to 65 years old sedentary women. The half of recommended minimum amount of exercise intervention (540—648 kcal/wk) after 3 to 6 months can improve the stride length and cardiorespiratory fitness and it can keep for a long time after 3-month detraining in 55 to 65 years old sedentary women. (2)The improvement of health benefit is evident in running after 3-month intervention, and it is obvious in Tai Chi after 6-month intervention in the later. The health benefit is easier to maintain in walking and Tai Chi after detraining, and it is not obvious in square dancing compared with the other aerobic exercise after 3-month or 6-month intervention.