自律神経活動と心臓血管系パラメータのゆらぎ

概要

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Fluctuations in cardiovascular parameters, such as heartbeat period, digit-blood-flow pulse wave, peripheral skin temperature and arterial blood pressure, are investigated by spectral analysis. The influences of autonomic nervous systems on these fluctuations are assessed by means of changes in power spectral patterns induced by postural changes. In the sitting posture seated in a comfortable chair, these fluctuations reveal the broadband 1/f power spectra with superimposed peaks due to intrinsic physiological oscillations, such as respiratory rhythm with period of 3 sec, baroreceptor reflex rhythm (Mayer wave) with period of 10 sec and thermoregulatory rhythm with period of 18 sec. In the standing posture, the low frequency component of the power spectrum decreases and the slope of the regression line fitted to the power spectrum becomes more gentle than 1/f spectral pattern. On the contrary, in the supine posture, the low frequency component of the power spectrum increases and the slope of the regression line becomes steeper than 1/f spectral pattern. These findings suggest that the complex nonlinear interactions of sympathetic and parasympathetic nervous systems are reflected on the spectral patterns of the fluctuations in cardiovascular parameters.
東海大学の論文