JMU JMIR Mhealth Uhealth JMIR mHealth and uHealth 2291-5222 JMIR Publications Toronto, Canada v7i1e11616 30609980 10.2196/11616 Corrigenda and Addenda Corrigenda and Addenda Figure Correction: Resting and Postexercise Heart Rate Detection From Fingertip and Facial Photoplethysmography Using a Smartphone Camera: A Validation Study Eysenbach Gunther Yan Bryan P MBBS, FRACP, FRCP (Edin), FACC 1
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) 852 2632 3142 852 2637 3852 bryan.yan@cuhk.edu.hk
http://orcid.org/0000-0003-0430-5752 Chan Christy KY BSc (Hons) 1 http://orcid.org/0000-0001-7585-3153 Li Christien KH 2 http://orcid.org/0000-0001-8305-3850 To Olivia TL RN, MSc 1 http://orcid.org/0000-0002-7554-2766 Lai William HS BSc (Hons) 1 http://orcid.org/0000-0002-0802-4969 Tse Gary PhD, FACC 1 3 http://orcid.org/0000-0001-5510-1253 Poh Yukkee C PhD 4 http://orcid.org/0000-0001-6925-8614 Poh Ming-Zher PhD 4 http://orcid.org/0000-0002-3510-1923 Division of Cardiology Department of Medicine and Therapeutics The Chinese University of Hong Kong and Prince of Wales Hospital Hong Kong China (Hong Kong) Faculty of Medicine Newcastle University Newcastle upon Tyne United Kingdom Li Ka Shing Institute of Health Sciences Faculty of Medicine The Chinese University of Hong Kong Hong Kong China (Hong Kong) Cardiio Inc Cambridge, MA United States Corresponding Author: Bryan P Yan bryan.yan@cuhk.edu.hk 012019 03 01 2019 7 1 e11616 17 7 2018 9 10 2018 ©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. 2019

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 http://mhealth.jmir.org/2017/3/e33/

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.

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.