Supramaximal intermittent exercise significantly reduced vagal-related heart rate variability indices during the first post-exercise night compared to baseline (P=0.03 for mean RR intervals).
Does supramaximal intermittent exercise affect short- and long-term heart rate variability in healthy males?
Supramaximal intermittent exercise significantly depresses vagal-related HRV indices immediately and 12 hours post-exercise, with recovery by 36 hours, demonstrating the profound impact of exercise intensity on autonomic recovery.
p-value: p=0.03
PURPOSE: To assess the effect of supramaximal intermittent exercise on long-term cardiac autonomic activity, inferred from heart rate variability (HRV). METHODS: Eleven healthy males performed a series of two consecutive intermittent 15-s runs at 95% VIFT (i.e., speed reached at the end of the 30-15 Intermittent Fitness Test) interspersed with 15 s of active recovery at 45% VIFT until exhaustion. Beat-to-beat intervals were recorded during two consecutive nights (habituation night and 1st night) before, 10 min before and immediately after exercise, as well as 12 h (2nd night) and 36 h (3rd night) after supramaximal intermittent exercise. The HRV indices were calculated from the last 5 min of resting and recovery periods, and the first 10 min of the first estimated slow wave sleep period. RESULTS: Immediate post-supramaximal exercise vagal-related HRV indices were significantly lower than immediate pre-supramaximal exercise values (P < .001). Most vagal-related indices were lower during the 2nd night compared with the 1st night (eg, mean RR intervals, P = .03). Compared with the 2nd night, vagal-related HRV indices were significantly higher during the 3rd night. Variables were not different between the 1st and 3rd nights; however, we noted a tendency (adjusted effect size, aES) for an increased normalized high-frequency component (P = .06 and aES = 0.70) and a tendency toward a decreased low-frequency component (P = .06 and aES = 0.74). CONCLUSION: Results confirm the strong influence of exercise intensity on short- and long-term postexercise heart rate variability recovery and might help explain the high efficiency of supramaximal training for enhancing indices of cardiorespiratory fitness.
Hani et al. (Tue,) conducted a other in Healthy (n=11). Supramaximal intermittent exercise vs. Pre-exercise baseline was evaluated on Vagal-related heart rate variability (HRV) indices during the 2nd night (12 h post-exercise) (p=0.03). Supramaximal intermittent exercise significantly reduced vagal-related heart rate variability indices during the first post-exercise night compared to baseline (P=0.03 for mean RR intervals).