| Objective:(1)The middle-aged and elderly people were divided into exercise group and non-exercise group and the changes of heart rate variability,heart rate and vital capacity in the resting state,the recovery period immediately after 6 minutes walking test and the recovery period 10 minutes were observed in both groups;analyze the effects of exercise frequency,duration and period on heart rate variability.(2)Analyze the regulation of cardiac autonomic nervous system and cardiopulmonary function in the middle-aged and elderly people during short-term recovery after 6 minutes walking test(5-10min).To explore the possible mechanism of the difference in the recovery level of autonomic nervous system and cardiopulmonary function by sports exercise and to further analyze the physiological significant of each index parameter.Methods:Seventy-seven subjects aged 50-75 were recruited from five communities,63 healthy subjects were selected through general date survey,AHA/ACSM Healthy/Fitness Facility Preparticipation Screening Questionnaire and medical examination,37 in exercise group and 26 in non-exercise group.Six minute walking test was performed in both groups.Heart rate variability,heart rate,vital capacity and6 minute walking distance were measured in resting state,immediately after walking and 10 minutes after recovery period.The characteristics of heart rate variability,heart rate,vital capacity and the changes of each index in the two groups were analyzed.Results:(1)In rest state,HFnorm and vital capacity of exercise group were significantly higher than those of non-exercise group(p<0.05);the heart rate of exercise group was significantly lower than that of non-exercise group(p < 0.05).(2)During the recovery period immediately after walking,HFnorm,vital capacity,walking distance in exercise group were significantly larger than those in non-exercise group(p<0.01),LF/HF was significantly smaller than those in non-exercise group(p<0.05);HFnorm and vital capacity of non-exercise group were significantly lower than those of rest state(p<0.05),LF/HF and heart rate were significantly higher than those of rest state(p<0.01);the HRV index of exercise group had no significant change compared with rest state,heart rate in exercise group increased significantly compared with that rest quite(p<0.01),vital capacity decreased significantly(p<0.05).(3)10 minutes after walking,the values of HFnorm and vital capacity in exercise group were significantly higher than those in non-exercise group(p<0.01),while LF/HF and heart rate were significantly lower than those in non-exercise group(p<0.05,p<0.01).HRV indexes in both groups gradually recovered,while heart rate and vital capacity indexes in non-exercise group were not restored to rest level(p<0.01).(4)The time and duration of exercise have significant influence on the changes of HRV in middle-aged and old people.Conclusions:(1)In rest quite,the levels of vagus nerve,sympathetic nerve tension and cardiopulmonary function in the exercise group were higher than those in the non-exercise group,suggesting that physical exercise has a positive effect on vagus nerve,sympathetic nerve and cardiopulmonary function.(2)During the recovery period immediately after walking,the tension of vagus nerve and the balance of sympathetic vagus nerve in the non-exercise group were significantly lower than those in the exercise group,and the recovery was delayed.Therefore,the degree of autonomic nerve imbalance in the recovery period immediately after exercise in the non-exercise group was greater than that in the exercise group.(3)10 minutes after walking,HRV indexes and cardiopulmonary function indexes of exercise group have been restored to the quiet level,while those of non-exercise group have been delayed,suggesting that physical exercise can improve the adaptability of autonomic nervous system and cardiopulmonary function of the elderly after exercise.(4)The autonomic nervous regulation function of middle-aged and old people in exercise group is affected to a certain extent by the time and duration of exercise. |
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