Method and apparatus for measuring pulse rate and oxygen saturation achieved during exercise
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United States of America Patent
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Feb 11, 2014
Grant Date -
Jan 22, 2009
app pub date -
Jul 17, 2008
filing date -
Jul 19, 2007
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Abstract
In order to measure a pulse rate and an oxygen saturation of a subject who is in an exercised state, each of two pulse wave signals obtained from the subject is separated into a signal component and a noise component. A frequency spectrum of the signal component and a frequency spectrum of the noise component are obtained. It is judged whether a body motion of the subject is occurred based on the frequency spectrum of the signal component and the frequency spectrum of the noise component. A pulsation frequency is determined based on the judgment as to the body motion. The pulse rate is calculated based on the pulsation frequency. The oxygen saturation is calculated based on a ratio of spectra of the two pulse wave signals corresponding to the pulsation frequency.
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