Measuring Heart Rate Variability in Free-Living Conditions Using Consumer-Grade Photoplethysmography: Validation Study

Emily Lam   ^{1 *} , BEng ;   Shahrose Aratia   ^{2 *} , BSc ;   Julian Wang   ³ , MD ;   James Tung   ⁴ , PhD

¹ Possibility Engineering and Research Laboratory, Bloorview Research Institute, Toronto, ON, Canada

² Department of Occupational Science and Occupational Therapy, University of Toronto, Toronto, ON, Canada

³ Michael G Degroote School of Medicine, McMaster University, Hamilton, ON, Canada

⁴ Department of Mechanical & Mechatronics Engineering, University of Waterloo, Waterloo, ON, Canada

*these authors contributed equally