ウェーブレット変換による姿勢変換時の自律神経機能評価

概要

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An evaluation of the autonomic nervous function is requisite for diagnosis of the cardiopathy and estimating of the workload and fatigue. A Schellong test has been widely used to analyze heart rate variability at standing posture following supine posture. In this paper, we described the analytical results about heart rate variability during the Schellong test using the wavelet transform. The wavelet transform shows good time and frequency resolution, especially for the analysis of non-stationary signals. In wavelet transforms, a time series for 20 or 30 seconds is necessary. Therefore, the frequency information around the transient change is the average value before and after the change. We proposed a method for extracting accurate frequency information from the starting point the measurement of the pan of transient change, when the heart rate variability is analyzed using wavelet transform. The proposed method determined the transitional change in the frequency information, which are not possible using classical methods. The transitional change in the activity degree and the activity balance of the autonomous nerve at the posture change were estimated using our method.
大同工業大学の論文