Published on in Vol 9, No 3 (2021): March
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/25313, first published
.
![Measurement of Heart Rate Using the Polar OH1 and Fitbit Charge 3 Wearable Devices in Healthy Adults During Light, Moderate, Vigorous, and Sprint-Based Exercise: Validation Study Measurement of Heart Rate Using the Polar OH1 and Fitbit Charge 3 Wearable Devices in Healthy Adults During Light, Moderate, Vigorous, and Sprint-Based Exercise: Validation Study](https://asset.jmir.pub/assets/a78b8ccbfd1110e1c88cb9310444b22a.png 480w,https://asset.jmir.pub/assets/a78b8ccbfd1110e1c88cb9310444b22a.png 960w,https://asset.jmir.pub/assets/a78b8ccbfd1110e1c88cb9310444b22a.png 1920w,https://asset.jmir.pub/assets/a78b8ccbfd1110e1c88cb9310444b22a.png 2500w)
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