抄録
Heart rate variability (HRV) is the degree of fluctuation in the time intervals between heart beats obtained from ECG. HRV is a global measure of autonomic nervous system (ANS) function. Several researchers attempted to use pulse rate variability (PRV) instead of HRV for ANS monitoring. Pulse rate is obtained from the pulse interval of PPG. PPG measures the relative blood volume change that is ejected by the heart. Therefore, there is a strong correlation between the HRV and the PRV, and the PRV is regarded as an acceptable alternative to HRV at rest. In this study, we focused on the influence to pulse rate variability by change of body position, and we evaluated the suitability of PRV for ANS monitoring at state other than rest. Five healthy volunteers participated in this experiment. ECG and PPG were recorded simultaneously during 3 minutes before and after standing from the chair. The results of the correlation coefficient indicated a strong correlation (r = 0.9) between the HRV and the PRV. On the other hand, the results of the wavelet analysis showed the different tendency during standing from the chair.
