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Published on 03.01.19 in Vol 7, No 1 (2019): January

Preprints (earlier versions) of this paper are available at http://preprints.jmir.org/preprint/11616, first published Jul 17, 2018.

This paper is in the following e-collection/theme issue:

    Corrigenda and Addenda

    Figure Correction: Resting and Postexercise Heart Rate Detection From Fingertip and Facial Photoplethysmography Using a Smartphone Camera: A Validation Study

    1Division of Cardiology, Department of Medicine and Therapeutics, The Chinese University of Hong Kong and Prince of Wales Hospital, Hong Kong, China (Hong Kong)

    2Faculty of Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom

    3Li Ka Shing Institute of Health Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China (Hong Kong)

    4Cardiio Inc, Cambridge, MA, United States

    Corresponding Author:

    Bryan P Yan, MBBS, FRACP, FRCP (Edin), FACC

    Division of Cardiology

    Department of Medicine and Therapeutics

    The Chinese University of Hong Kong and Prince of Wales Hospital

    9/F, Division of Cardiology, Department of Medicine and Therapeutics, Clinical Sciences Building

    Prince of Wales Hospital, Shatin, N.T.

    Hong Kong,

    China (Hong Kong)

    Phone: 852 2632 3142

    Fax:852 2637 3852

    Email:



    In “Resting and Postexercise Heart Rate Detection From Fingertip and Facial Photoplethysmography Using a Smartphone Camera: A Validation Study” (JMIR Mhealth Uhealth 2017;5(3):e33), there was an error in Figure 2. The scatter plot of Figure 2C (Postexercise HR from fingertip PPG signals) was a duplicate of  Figure 2D (Postexercise HR from facial PPG signals). The scatter plot of Figure 2C has been updated with a correct value of R2=0.991. The equation of line (y=0.27+0.99*x) remains unchanged.

    The correction will appear in the online version of the paper on the JMIR website on January 3, 2019, together with the publication of this correction notice. Because this was made after submission to PubMed, PubMed Central, and other full-text repositories, the corrected article also has been resubmitted to those repositories.

    Figure 2. Scatter plots comparing measurements of heart rate (HR) estimated from the Cardiio smartphone phone app photoplethysmographic (PPG) signals and from a reference electrocardiogram (ECG). P<.001 for all correlations. (A) Resting estimated HR from fingertip PPG signals. (B) Resting estimated HR from facial PPG signals. (C) Postexercise HR from fingertip PPG signals. (D) Postexercise HR from facial PPG signals.
    View this figure

    Edited by G Eysenbach; This is a non-peer-reviewed article. submitted 17.07.18; accepted 09.10.18; published 03.01.19

    ©Bryan P Yan, Christy KY Chan, Christien KH Li, Olivia TL To, William HS Lai, Gary Tse, Yukkee C Poh, Ming-Zher Poh. Originally published in JMIR Mhealth and Uhealth (http://mhealth.jmir.org), 03.01.2019.

    This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR mhealth and uhealth, is properly cited. The complete bibliographic information, a link to the original publication on http://mhealth.jmir.org/, as well as this copyright and license information must be included.