| Summary: | 碩士 === 國立交通大學 === 電控工程研究所 === 101 === This thesis reports the results of our study on cardiorespiratory interactions for four groups of volunteers: (cntl-I) normal subjects under breathing control, (cntl-II) normal subjects in continuous attention test (CAT), (expt-I) Chan-meditation practitioners during Chan meditation, and (expt-II) practitioners in CAT. Quantification of HRV (heart rate variability) was employed to evaluate the regulation of sympathetic-parasympathetic activity and to investigate the efficiency of pulmonary gas exchange. In this study, two methods were developed to analyze the HRV activity: (1) adaptive frequency range (AFR) and (2) Poincaré plot analysis (PPA).
ECG (electrocardiograph) and respiratory signals were recorded from four groups mentioned above. In convention, frequency-domain schemes of HRV analysis are often adopted to quantify the efficacy of autonomic nervous system (ANS). On the other hand, time-domain schemes are seldom used in the study of HRV. AFR method and PPA were compared in the thesis. Our preliminary study shows that the high-frequency parameter of AFR (HFa), the marker of parasympathetic activity, exhibits positive relation with the SD1 (the standard deviation of the widths on the distribution of Poincaré plot).
Preliminary results show that, in the resting state, the heart rate and respiratory rate of cntl-II volunteers become lower and HFa and SD1 become higher when compared with the results in CAT. It indicates the increase of parasympathetic activity. Since Chan meditation can help harmonizing the operation of different organ systems in the body, heart rate and respiratory rate might be maintained at a stable level.
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