Moderate physical exercise led to a decrease in overall coherence and changes in directional coupling patterns, notably establishing a dominant influence from heart rate variability to peripheral circulation in the low-frequency range.
Observational (n=10)
No
Does moderate physical exercise alter the coupling patterns between heart rate variability, respiration, and peripheral circulation in healthy subjects?
Moderate physical activity alters the directional coupling between low-frequency and high-frequency rhythms in respiration, heart rate, and peripheral circulation, confirming the nonlinearity of the cardiovascular system.
Aim of the study is to apply the analysis of phase dynamics to investigation of the coupling patterns between heart rate variability, respiration and peripheral circulation in healthy subjects at rest and after moderate physical exercises. Material and Methods ― 30-minutes electrocardiogram (ECG), photoplethysmogram (PPG) and respiration records were obtained from healthy subjects aged 22±2 (mean ± standard deviation) before and after active Martine Kushelevsky test (20 squats in 30 seconds). The coherence function was estimated between all the signals from each subject, and the phase dynamics modeling was used to detect the directional coupling in high-frequency (HF; 0.14-0.40 Hz) and low-frequency ranges (LF; 0.04-0.14 Hz). Results ― At rest (before the physical activity) no statistically significant couplings were detected between the HF rhythms of respiration and heart rate (RR intervals). For the HF rhythms in respiration and PPG, the influence respirationPPG was detected. No couplings were detected between the LF rhythms. After the moderate physical exercise, predominant direction of the influence was RR intervals PPG in the LF range and both RR intervals respiration and PPG respiration in the HF range. The influence PPG respiration was delayed by several seconds. Conclusion ― adaptation to the moderate physical activity has led to the decrease in the overall coherence and changes in patterns of directional coupling between the LF and HF rhythms in respiration, heart rate and peripheral circulation. The obtained results confirm nonlinearity and complexity of the coupling patterns in cardiovascular system.
Kiselev et al. (Wed,) conducted a observational in Healthy (n=10). Moderate physical exercise (Martine Kushelevsky test) vs. Rest (before physical activity) was evaluated on Coherence function and directional coupling between heart rate variability, photoplethysmogram variability, and respiration. Moderate physical exercise led to a decrease in overall coherence and changes in directional coupling patterns, notably establishing a dominant influence from heart rate variability to peripheral circulation in the low-frequency range.