Published on in Vol 5, No 1 (2020): Jan-Dec
![Measuring Heart Rate Variability in Free-Living Conditions Using Consumer-Grade Photoplethysmography: Validation Study Measuring Heart Rate Variability in Free-Living Conditions Using Consumer-Grade Photoplethysmography: Validation Study](https://asset.jmir.pub/assets/604f67d642f2ec4d0fbc3234345baacb.png 480w,https://asset.jmir.pub/assets/604f67d642f2ec4d0fbc3234345baacb.png 960w,https://asset.jmir.pub/assets/604f67d642f2ec4d0fbc3234345baacb.png 1920w,https://asset.jmir.pub/assets/604f67d642f2ec4d0fbc3234345baacb.png 2500w)
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