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

Bryan P Yan   ¹ , MBBS, FRACP, FRCP (Edin), FACC ;   Christy KY Chan   ¹ , BSc (Hons) ;   Christien KH Li   ² ;   Olivia TL To   ¹ , RN, MSc ;   William HS Lai   ¹ , BSc (Hons) ;   Gary Tse   ^{1, 3} , PhD, FACC ;   Yukkee C Poh   ⁴ , PhD ;   Ming-Zher Poh   ⁴ , PhD

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

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

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

⁴ Cardiio Inc, Cambridge, MA, United States