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Sensors 2016, 16(3), 342; doi:10.3390/s16030342

Improving Pulse Rate Measurements during Random Motion Using a Wearable Multichannel Reflectance Photoplethysmograph

1
Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA 01605, USA
2
Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Oliver Amft
Received: 2 January 2016 / Revised: 26 February 2016 / Accepted: 1 March 2016 / Published: 7 March 2016
(This article belongs to the Special Issue Wearable Sensors)
View Full-Text   |   Download PDF [5224 KB, uploaded 7 March 2016]   |  

Abstract

Photoplethysmographic (PPG) waveforms are used to acquire pulse rate (PR) measurements from pulsatile arterial blood volume. PPG waveforms are highly susceptible to motion artifacts (MA), limiting the implementation of PR measurements in mobile physiological monitoring devices. Previous studies have shown that multichannel photoplethysmograms can successfully acquire diverse signal information during simple, repetitive motion, leading to differences in motion tolerance across channels. In this paper, we investigate the performance of a custom-built multichannel forehead-mounted photoplethysmographic sensor under a variety of intense motion artifacts. We introduce an advanced multichannel template-matching algorithm that chooses the channel with the least motion artifact to calculate PR for each time instant. We show that for a wide variety of random motion, channels respond differently to motion artifacts, and the multichannel estimate outperforms single-channel estimates in terms of motion tolerance, signal quality, and PR errors. We have acquired 31 data sets consisting of PPG waveforms corrupted by random motion and show that the accuracy of PR measurements achieved was increased by up to 2.7 bpm when the multichannel-switching algorithm was compared to individual channels. The percentage of PR measurements with error ≤ 5 bpm during motion increased by 18.9% when the multichannel switching algorithm was compared to the mean PR from all channels. Moreover, our algorithm enables automatic selection of the best signal fidelity channel at each time point among the multichannel PPG data. View Full-Text
Keywords: motion artifacts; multichannel photoplethysmograph; multichannel template matching; pulse rate; wearable sensor; pulse oximeter motion artifacts; multichannel photoplethysmograph; multichannel template matching; pulse rate; wearable sensor; pulse oximeter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Warren, K.M.; Harvey, J.R.; Chon, K.H.; Mendelson, Y. Improving Pulse Rate Measurements during Random Motion Using a Wearable Multichannel Reflectance Photoplethysmograph. Sensors 2016, 16, 342.

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