Key result
The head-up position was associated with a higher phase synchronization index of arterial pressure and heart rate at Meyer waves (0.1 Hz) compared to the supine position.
Why the study?
Does vertical position compared to supine position alter the phase synchronization of arterial pressure and heart rate?
Observational (n=11)
Does vertical position compared to supine position alter the phase synchronization of arterial pressure and heart rate?
Phase synchronization of arterial pressure and heart rate at 0.1 Hz increases in the head-up position, suggesting its utility as a measure of baroreflex activity.
Does not support changes in postural assessment; leaves open validation of phase synchronization as a baroreflex marker.
Phase differences between signals resulting from band-pass digital filtering of mean arterial pressure and heart rate were calculated using analytic signal approach. Frequency dependencies of phase synchronization index were obtained for 11 subjects in supine and vertical positions. It was shown that at the frequency of Meyer waves (about 0.1 Hz) phase synchronization index was sufficiently higher for head-up position, whereas at high frequency (respiratory waves) it did not depend on the body position.
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Боровик et al. (2014) reported an observational. Head-up (vertical) position vs. Supine position was evaluated on Phase synchronization index at Meyer waves (0.1 Hz) and respiratory waves. The head-up position was associated with a higher phase synchronization index of arterial pressure and heart rate at Meyer waves (0.1 Hz) compared to the supine position.
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