Interaction between peripheral blood flow and low frequencycomponents in cardiovascular variability signals

摘要

The contribution of vasomotion to low frequency (LF, 0.03-0.14 Hz)waves in arterial pressure (AP, finger pletismography) and RRvariabilities is addressed by comparing the spectra of RR, systolic AP(SAP), diastolic AP (DAP), and peripheral resistances (RES, mean AP overmean flow by laser Doppler) in the palmar region. In 22 normalvolunteers, recordings were performed at rest (R) in clinostaticposition and during mild exercise (EXEl, 10% maximum effort) cycling inthe same position. LF predominance over the high frequency (HF,respiratory frequency) component was higher in SAP and even more in DAPthan in RR; HF was virtually absent in RES. The LF central frequencyshifted from 0.100 Hz for RR to 0.091 for SAP, 0.085 for DAP, and 0.073for RES. EXEl activated LF and inhibited HF in RR; but power andfrequency relationships in vascular parameters were not significantlychanged