著者

松村 健太 李 知炯 山越 健弘

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.54, no.3, pp.120-128, 2016-06-10 (Released:2016-11-23)

参考文献数

43

被引用文献数

2

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The advent of the smartphone, a compact but powerful and multifunctional computing device, permits the measurements of various physiological indices using a commercially available device alone. This is achieved by using built-in flash LED as a light source and built-in CMOS camera as a photo detector, and is called smartphone photoplethysmography (PPG). Although smartphone PPG is so easy that even a non-specialist can operate by oneself in daily life, it should be used with sufficient knowledge of its effectiveness and limitation. Otherwise, users may encounter unpredictable pitfalls. In this review article, we describe the basics of smartphone PPG in terms of the general background of PPG, restrictions especially for smartphone PPG, and caution during measurement, which are essential information for effective daily life measurement.

著者

山越 健弘 李 知炯 松村 健太

出版者

福岡工業大学

雑誌

挑戦的萌芽研究

巻号頁・発行日

2016-04-01

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諸外国では飲酒運転防止装置の実用化が進み,呼気ガス式手法が一般的になってきたが,様々な問題点がある.そこで,光電容積脈波を利用し,血中成分の吸光特性から指尖部の入射光に対して散乱された光を検出する方法に着目した.しかし,アルコール固有の吸収帯域は水への吸収度が高い近赤外長波長帯域の905 nm,1185 nm,および1690 nmに存在し,人間の身体のほとんどが水分であり,検出される光が極めて微弱で,動作や外部環境に敏感でノイズが多く,これを如何に低減できるかの実験検討をまず行い,次いで人を対象とした飲酒負荷実験を行った結果,光電容積脈波にて血中アルコール濃度が予測可能であることが示唆された。

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.