停經後婦女從事多元運動後停止運動與再訓練 對肌肉表現之影響.

Objectives: Menopause and aging-related hormonal changes lead to declines in muscle strength and mass in women. The World Health Organization and American College of Sports Medicine both recommend that older adults should engage in multicomponent exercise. This study investigated the effects of multicomponent exercise, detraining, and retraining on muscle performance in postmenopausal women. Methods: Thirty-three postmenopausal women (age: 67.2 ± 5.3 years) were randomly assigned to an experimental or a control group. The experimental group underwent 12 weeks of multicomponent exercise followed by 12 weeks of detraining and 8 weeks of retraining; the control group maintained their normal lifestyle. Regarding mechanical characteristics, the sit-to-stand test was performed and the skeletal muscle mass index (SMI) measured at four time points: before training, after 12 weeks of training, after 12 weeks of detraining, and after 8 weeks of retraining. The mechanical parameters measured were the peak ground reaction force (GRF), time to reach peak force, and time from sitting to standing, which can be used to assess lower-limb muscle strength, contraction speed, and dynamic balance. Results: The peak GRF and SMI of the experimental group were significantly better than those of the control group after the training, decreased during the detraining, but then rapidly recovered during the retraining. Conclusions: Multicomponent exercise enhances muscle strength and mass in postmenopausal women. The results of this study can serve as a reference for the design of community-based exercise programs. [ABSTRACT FROM AUTHOR]