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Journal of Biomedical Optics • Open Access

Motion-compensated noncontact imaging photoplethysmography to monitor cardiorespiratory status during exercise
Author(s): Sun Yu; Sijung Hu; Vicente Azorin-Peris; Jonathon A. Chambers; Yisheng Zhu; Stephen E. Greenwald

Paper Abstract

With the advance of computer and photonics technology, imaging photoplethysmography [(PPG), iPPG] can provide comfortable and comprehensive assessment over a wide range of anatomical locations. However, motion artifact is a major drawback in current iPPG systems, particularly in the context of clinical assessment. To overcome this issue, a new artifact-reduction method consisting of planar motion compensation and blind source separation is introduced in this study. The performance of the iPPG system was evaluated through the measurement of cardiac pulse in the hand from 12 subjects before and after 5 min of cycling exercise. Also, a 12-min continuous recording protocol consisting of repeated exercises was taken from a single volunteer. The physiological parameters (i.e., heart rate, respiration rate), derived from the images captured by the iPPG system, exhibit functional characteristics comparable to conventional contact PPG sensors. Continuous recordings from the iPPG system reveal that heart and respiration rates can be successfully tracked with the artifact reduction method even in high-intensity physical exercise situations. The outcome from this study thereby leads to a new avenue for noncontact sensing of vital signs and remote physiological assessment, with clear applications in triage and sports training.

Paper Details

Date Published: 1 July 2011
PDF: 10 pages
J. Biomed. Opt. 16(7) 077010 doi: 10.1117/1.3602852
Published in: Journal of Biomedical Optics Volume 16, Issue 7
Show Author Affiliations
Sun Yu, Loughborough Univ. (United Kingdom)
Sijung Hu, Loughborough Univ. (United Kingdom)
Vicente Azorin-Peris, Loughborough Univ. (United Kingdom)
Jonathon A. Chambers, Loughborough Univ. (United Kingdom)
Yisheng Zhu, Shanghai Jiao Tong Univ. (China)
Stephen E. Greenwald, Barts and The London School of Medicine and Dentistry (United Kingdom)


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