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KMID : 0363620080290020060
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Journal of Korean Oriental Medicine
2008 Volume.29 No. 2 p.60 ~ p.70
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Comparative Study between the Finger Photoplethysmographic Waveform of the Old and That of the Young Whose Harmonics Deceased with Notch Filtration
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Nam Tong-Hyun
Shin Sang-Hoon
Park Young-Jae
Park Young-Bae
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Abstract
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Objectives: The aim of the present investigation was to determine whether the finger photoplethysmography (PPG) of the young will become analogous to those of the old when the PPG harmonic components in the young decrease.
Methods: The PPG was measured in 46 old men (21 males and 25 females) over the age of 60 years and 10 young men (5 males and 5 females). We acquired the representative pulse waveform of old men by averaging the PPG
waveforms measured in the old men. after the PPG harmonic components in the young men were diminished with notch filtering, we compared the representative pulse waveform of old men and those of the young men.
Results: The PPG waveform of the young males became analogous to the representative pulse waveform of the old as the PPG harmonic components in the young were diminished with notch filtering. Especially after the second
harmonic component in the young was diminished with notch filtering, increase of the Pearson’s correlation coefficient
was prominent. On the other hand, the Pearson’s correlation coefficient between the PPG waveforms of the young females and that of the old deceased after the second harmonic component diminished in the young.
Conclusions: Decrease of the second harmonic component may be a precondition of typical age-related change of the pulse waveform in the healthy male.
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KEYWORD
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Photoplethysmography, spectrum analysis, harmonics, notch filter
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