RGB and Near-Infrared Light Reflectance/Transmittance Photoplethysmography for Measuring Heart Rate During Motion
RGB and Near-Infrared Light Reflectance/Transmittance Photoplethysmography for Measuring Heart Rate During Motion
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DOI：
10.1109/access.2020.2990438
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发表时间：
2020-01-01
期刊：
影响因子：
3.9
通讯作者：
Kato, Yuji
中科院分区：
文献类型：
--
作者：
Matsumura, Kenta;Toda, Sogo;Kato, Yuji
光电容积描记术（PPG）是测量包括心率（HR）在内的各种生理指标的简单方法。为了防止运动伪影，应选择用于PPG测量的最佳光波长。然而，这一对策尚未得到彻底审查。这项研究解决了PPG的鲁棒性对运动伪影不同的光波长和测量模式，以准确地确定HR.Twelve健康志愿者在PPG测量过程中进行了运动伪影实验，其中，他们被要求保持静止或水平或垂直挥动他们的手，尽可能快，有节奏。评价反射模式蓝色（RB）、绿色（RG）、红色（RR）和近红外（RNIR）光以及透射模式红色（TR）和近红外（TNIR）光，以获得沿着心电图（用于参考HR）和手部加速度测量的PPG信号。分析显示，与TR PPG相比，RB和RG PPG模式使信噪比增加约8 dB，从两者获得的HR未表现出固定或成比例偏倚，Pearson相关系数高于0.986。此外，RNIR PPG上级TR PPG约4 dB，其计算的HR未显示固定或比例偏倚，Pearson相关系数为0.967。RR、TNIR和TR PPG模式显示出相当和较差的性能。因此，在反射模式下，蓝光和绿色光以及随后的近红外光是使用PPG测量HR的推荐设置。这些发现可以作为研究人员和工程师改进PPG测量和设备的指南。
Photoplethysmography (PPG) is a simple method to measure various physiological indices, including heart rate (HR). To prevent motion artifacts, the optimal light wavelength for PPG measurements should be selected. However, this countermeasure has not been examined thoroughly. This study addressed PPG robustness against motion artifacts for different light wavelengths and measuring modes to accurately determine HR. Twelve healthy volunteers underwent motion artifact experiments during PPG measurements, in which they were asked to either remain still or wave their hands horizontally or vertically as fast and rhythmically as possible. Reflectance mode blue (RB), green (RG), red (RR), and near-infrared (RNIR) lights and transmittance mode red (TR) and near-infrared (TNIR) lights were evaluated for PPG signals acquired along with electrocardiogram (for reference HR) and hand acceleration measurements. The analysis revealed that the RB and RG PPG modes increased the signal-to-noise ratio by approximately 8 dB compared to TR PPG, and the HR obtained from both did not exhibit fixed or proportional bias, with a Pearson's correlation coefficient above 0.986. Furthermore, RNIR PPG was superior to TR PPG by approximately 4 dB, and its calculated HR did not show fixed or proportional bias, with a Pearson's correlation coefficient of 0.967. The RR, TNIR, and TR PPG modes showed comparable and inferior performance. Therefore, blue and green lights followed by near-infrared light in reflectance mode are the recommended settings to measure HR using PPG. These findings may serve as guidelines for researchers and engineers to improve PPG measurements and devices.