Assessment of Electrocardiogram Indices in Postmenopausal Women: Effects of Aerobic Exercise and Detraining

Introduction: Electrocardiogram (ECG) indices are valuable tools for the diagnosis, depolarization, and repolarization of the myocardium during aerobic exercise and detraining. The purpose of this study was to investigate the effects of 12week moderateintensity aerobic exercise and 5 months detraining on ECG indices in postmenopausal women. Methods: Twentyfour postmenopausal women aged 5070 years were randomly assigned to exercise (E, n=12) and control (C, n=12) groups. E group performed 12week moderateintensity aerobic exercise program (WWJMIAEPR), and then 5 months detraining remained, but the C group participated in no intervention during the 8 months of the study. The ECG indices were measured at baseline, after 12week exercise, and after 5month detraining. Results: After 12 weeks, ECG indices were not significantly different (P gt;0.05) between the groups, except for PR interval (P≤0.05) which was significantly higher in the E group. After 5month detraining, indices were not significantly different between the groups (P gt;0.05), except for PR segment and ST interval (P≤0.05) which were significantly decreased in the E group. Conclusion: The results suggested that 12 weeks of walking jogging aerobic exercise with 6570% maximal heart rate increased the PR interval. In addition, PR segment and ST interval decreased after 5 months of detraining period in sedentary postmenopausal women.