RESPIRATORY STATE ESTIMATION APPARATUS, RESPIRATORY STATE ESTIMATION METHOD, AND PROGRAM RECORDING MEDIUM

摘要

A respiratory state estimation apparatus estimates whether a respiratory state is equivalent to a first respiration including normal respiration or a second respiration smaller in respiratory ventilation volume than the first respiration. The apparatus includes an acquisition unit, a detector, a calculator, and an estimator. The acquisition unit acquires an electrocardiographic waveform of a user. The detector detects amplitudes of R waves in the electrocardiographic waveform. The calculator calculates a spectrum of the amplitudes by performing transform processing with respect to the amplitudes in a time width in which the spectrum has a spectrum shape with a peak in the first respiration and a spectrum shape without a peak in the second respiration. The estimator estimates a respiratory state of the user based on the spectrum.