研究目的
The purpose of this study was to study the characteristics of individual dynamics and the interaction of elements of the cardiovascular system (CVS). The problem of studying the mechanisms of oscillation with a characteristic frequency of 0.1 Hz in laser Doppler flowmetry (LDF) signals was considered.
研究成果
Phase synchronization of LDF signals with processes having a central nature in the frequency range of 0.04–0.15 Hz was revealed, indicating that in this frequency range, the LDF signal contains information on the processes of sympathetic baroreflex regulation of arterial vascular tone, similar to the FPG signal.
研究不足
The study's limitations include the specific frequency range of 0.04–0.15 Hz being considered, the sample size of 30 subjects, and the use of standard certified equipment which may not capture all nuances of the signals.
1：Experimental Design and Method Selection:
The study involved 30 subjects with simultaneous recording of electrocardiograms (ECG), photoplethysmogram (PPG), and laser Doppler flowmetry (LDF) signals during spontaneous breathing for 20 minutes.
2：Sample Selection and Data Sources:
Signals were recorded using standard certified equipment with a quantization width of 16 bits and a sampling rate of 120 samples per second per channel.
3：List of Experimental Equipment and Materials:
ECG was recorded in the I standard lead, respiration signal by an abdominal strain gauge sensor, LDF signal from the index fingers of both hands, and PPG signal from the middle finger of the right hand.
4：Experimental Procedures and Operational Workflow:
Signals were filtered in the band of
5：04–15 Hz and reselected to a sampling frequency of 5 Hz. The instantaneous phases of the signals were distinguished using the Hilbert transform. Data Analysis Methods:
The phase locking of HRV, PPG, LDFL, and LDFR processes in pairs was studied using an integral indicator of the summary percentage of phase synchronization S.
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