1 July 2011 Motion-compensated noncontact imaging photoplethysmography to monitor cardiorespiratory status during exercise
Author Affiliations +
J. of Biomedical Optics, 16(7), 077010 (2011). doi:10.1117/1.3602852
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.
Sun Yu, Sijung Hu, Vicente Azorin-Peris, Jonathon A. Chambers, Yisheng Zhu, Stephen E. Greenwald, "Motion-compensated noncontact imaging photoplethysmography to monitor cardiorespiratory status during exercise," Journal of Biomedical Optics 16(7), 077010 (1 July 2011). http://dx.doi.org/10.1117/1.3602852
Submission: Received ; Accepted



Beam propagation method



Imaging systems

Blood pressure

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