Relationship Between Power Spectral Densities of P-P and R-R Intervals.
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概要
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To investigate the role of the peripheral effector for the generation of heart rate variability, the relationship among the P-P, R-R. P-R, and R-P intervals were compared on five healthy male subject in the supine position. During supine rest, electrocardiogram was monitored, and P-P, R-R, P-R, and R-P intervals were measured. Power spectral densities (PSD) were esti-mated by using direct method for successive 256 intervals. PSDS were integrated at the low (PSD<SUB>LF</SUB> ; 0.05-0.15 cycle/beat) and high (PSD<SUB>HF</SUB> ; 0.20-0.40 cycle/beat) frequency bands. Mean interval times of P-P, R-R. R-P, and P-R intervals were 827±40, 827±40, 657±34, 170±19 msec, respectively. PSD<SUB>LF</SUB>S of P-P, R-R, R-P, and P-R intervals were 15677±2771, 15566±2815, 15345±2767, 1491±255 msec<SUP>2</SUP>/c/b, respectively. PSD<SUB>HF</SUB>S of P-P, R-R, R-P, and P-R intervals were 13289±3602, 12918±3897, 12558±3630, 2758±517 msec<SUP>2</SUP>/c/b, respectively. The PSD of P-R intervals showed white noise. These results might suggest that the periodic fluctuation would be formed at or above the sinoatrial node.
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日本生理人類学会 | 論文
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