BIOLOGICAL STATE ANALYZER AND COMPUTER PROGRAM

摘要

A novel technique for analyzing a biological state is provided. A body trunk biological signal (aortic pulse wave) extracted from the back of a body trunk is differentiated twice. By using a resultant second derivative waveform, a waveform component of a maximum amplitude of a low frequency appearing as a result of switch of an amplitude from attenuation to amplification in transition from a contracting phase to a diastolic phase of a ventricle is specified in each period of the second derivative waveform. Inflection points are specified that appear before and after the maximum amplitude waveform component. A biological state is analyzed using information about each of the inflection points. The two inflection points obtained from a reference form of the second derivative waveform of the aortic pulse wave substantially agree in time phase with first heart sound and second heart sound (or an R wave and a T wave in an electrocardiogram) indicating the dynamic state of a cardiovascular system. This enables analysis of a biological state.

主权项

1. A biological state analyzer comprising:
body trunk second derivative waveform calculating means that differentiates a time-series waveform of a body trunk biological signal twice extracted from the back of a body trunk by a body trunk biological signal measuring device to obtain a second derivative waveform in a time-series manner; maximum amplitude waveform component specifying means that specifies a waveform component of a maximum amplitude of a low frequency appearing as a result of switch of an amplitude from attenuation to amplification in transition from a contracting phase to a diastolic phase of a ventricle using the second derivative waveform obtained in a time-series manner by the body trunk second derivative waveform calculating means, the maximum amplitude waveform component being specified in each period of the second derivative waveform; inflection point specifying means that specifies inflection points appearing before and after the maximum amplitude waveform component specified by the maximum amplitude waveform component specifying means; and state analyzing means that analyzes a biological state using information about each of the inflection points specified by the inflection point specifying means.