Objective: This test is to evaluate the effects of high intensity anaerobic interval exercise, aerobic endurance Exercise and combined exercise order on the cardiac autonomic function in recovery period. Method: In a random cross-over design, 15 healthy young males performed four exercises: 600m anaerobic interval exercise, 30min high intensity continuous exercise, 600m anaerobic interval exercise plus 30min high intensity continuous exercise, 30min high intensity continuous exercise plus 600m anaerobic interval exercise. The R-R intervals was recorded, including pre-exercise (0-10min), the whole exercise period and recovery stage (0-20min). HRV analysis was made and lactic acid tests were arranged before and immediately after the exercises. Result: HR, EPOC and TRIMP for all the exercises significantly increased compared to rest, and there was no significant difference between the combined exercises. During the 20min recovery, as the recovery time increased, HR tended to decrease, but there was no significant difference between the different exercises at the same recovery stage. The changes were similar for RMSSD, SDNN, SDNN/HR, HF and LF, which were lower than those at rest. However, HF and LF significantly increased during 15-20min of the recovery time, and as the recovery time increased, LF/HF tended to increase significantly. Conclusion: The changes of HRV are nearly the same at the early recovery stage (0-20min) after high intensity anaerobic interval exercise, aerobic endurance exercise and combined exercise. This suggests that the regulation of cardiac autonomic function does not depend on exercise types after endurance exercise. Besides, the combined exercise order of high intensity anaerobic interval exercise and aerobic endurance exercise does not affect the regulation of cardiac autonomic function at the recovery stage. Within 20min in the recovery period, sympathetic activities remain higher. |