Coordination dynamics of circulatory and respiratory rhythms during psychomotor drive reduction.
A 0.15-Hz rhythm band in cutaneous blood oscillations in awake human subjects was studied in cardiovascular-respiratory time series of five subjects relaxing naïvely or practicing hypnoid relaxation (autogenic training, or AT). Time series analysis used nonlinear algorithms, time-frequency distribution (TFD), postevent scan (PES) method, and linear fast Fourier transform (FFT) algorithm. This 0.15-Hz rhythm band caused phase synchronization with respiration at 1:2, 1:1, and 2:1 integer number (n/m) ratios for extended periods. During wave epochs, the 0.15-Hz rhythm band was amplified, causing the 0.15-Hz rhythm band to also appear in interbeat intervals and arterial blood pressure fluctuations. If phase synchronization of the 0.15-Hz rhythm band with respiration was established at a 1:1 integer number ratio, it was maintained and resulted in consensualization of all cardiovascular-respiratory oscillations at this frequency. Simultaneous cardiovascular and respiratory oscillations at about 0.1 Hz did not affect the appearance of the 0.15-Hz rhythm band in the photoplethysmography (PPG) signal. Recent evidence suggests the emergence of the 0.15-Hz rhythm band and n/m phase synchronization to result from nonequilibrium phase transitions operational in the network of lower brainstem neurons and associated parasympathetic neuronal effectors. These findings corroborate our notion of the 0.15-Hz rhythm band as a marker of the trophotropic mode of operation.
Perlitz
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Klinik für Psychosomatik und Psychotherapeutische Medizin, Medizinische Fakultät der Rheinisch-Westfälisch-Technischen Hochschule Aachen, Pauwelsstrasse 30, Aachen 52057, Germany. vmperlitz@ukaachen.de
Cotuk
B
B
Lambertz
M
M
Grebe
R
R
Schiepek
G
G
Petzold
E R
ER
Schmid-Schönbein
H
H
Flatten
G
G
D000328:Adult; D000465:Algorithms; D001683:Biological Clocks / Q000502:physiology*; D001794:Blood Pressure / Q000502:physiology*; D002940:Circadian Rhythm / Q000502:physiology; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D017711:Nonlinear Dynamics; D017156:Photoplethysmography / Q000379:methods; D011597:Psychomotor Performance / Q000502:physiology*; D012123:Pulmonary Ventilation / Q000502:physiology*