著者

李 知炯 小柳 貴寛 松尾 勇輝 草場 志帆里 福本 悠斗 山越 健弘

出版者

福岡工業大学情報科学研究所

雑誌

福岡工業大学情報科学研究所所報 = Reports of Computer Science Laboratory (ISSN:13446169)

巻号頁・発行日

no.28, pp.19-24, 2017-10-31

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We compared the pulse rate (PR) derived from the ear photoplethysmogram (PPG) using a green light with the heart rate (HR) derived from the electrocardiogram (ECG) as a reference. In 20 young healthy participants (21.7 ± 2.7 S.D. years), simultaneous measurements of the ECG (chest lead II), peak green light (525 nm) PPG, and peak near-infrared light (810 nm) PPG from the two sites of the ear (tragus and helix-crus) and index fingertip, respectively, were made. We used a treadmill for walking task, at speeds of 0, 2, 4 and 6 km/h. The results showed that the PR derived from the green light PPG from the ear significantly related to HR derived from ECG (tragus: r = 0.984, helix-crus: r = 0.972, respectively). In addition, the limit of agreement (± 1.96 S.D.) in Bland-Altman plots between PR and HR were ± 5.960 bpm and ± 7.944 bpm. In conclusion, these findings suggest that green light ear PPG could be the basis of a suitable, practical, method for monitoring PR in normal daily life.

著者

草場 志帆里 李 知炯 甲斐 智希 福本 悠斗 山越 健弘

出版者

福岡工業大学総合研究機構

雑誌

福岡工業大学総合研究機構研究所所報

巻号頁・発行日

no.1, pp.97-102, 2018-12

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The aim of this study is to compare the heart rate (HR) derived from electrocardiogram (ECG) with the pulse rate (PR) derivedfrom the green light ear photo-plethysmogram (PPG) using an earphone. We developed a compact device that the PPG sensorcomprising a green LED and phototransistor was embedded in the earphone. The weight of device was 8.8 g. In 10 subjects,simultaneous measurements of ECG, and green light (525 nm) PPG from the front of tragus were made at the following treadmillspeeds: 0, 2, 4, 6, 8 km/h. During walking (2, 4 km/h), the results showed that the PR derived from the green light PPG from theear significantly related to HR derived from ECG (r = 0.98). In addition, the limit of agreement in Bland-Altman plots betweenthese indices were ± 3.95 (1.96 SD) bpm. In conclusion, these findings suggest that the green light ear PPG using earphone mightbe practical measurement for monitoring HR during walking.