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Correlation test (r)a of heart rate between reference electrocardiogram (ECG) and Cardiio smartphone app.
| Activity | ECG | Fingertip PPGb detection | Facial PPG detection |
| Resting | 1 | .997 | .997 |
| Postmoderate-intensity exercise | 1 | .994 | .982 |
| Postvigorous-intensity exercise | 1 | .995 | .980 |
| Postexercise overall | 1 | .995 | .983 |
aP<.001 for all correlations (correlation is significant at the .01 level, 2-tailed).
bPPG: photoplethysmography.
