Published on in Vol 7, No 6 (2019): June
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/13327, first published
.
![Estimating Maximal Oxygen Uptake From Daily Activity Data Measured by a Watch-Type Fitness Tracker: Cross-Sectional Study Estimating Maximal Oxygen Uptake From Daily Activity Data Measured by a Watch-Type Fitness Tracker: Cross-Sectional Study](https://asset.jmir.pub/assets/8b08ee612b7d247091f7de1740835832.png 480w,https://asset.jmir.pub/assets/8b08ee612b7d247091f7de1740835832.png 960w,https://asset.jmir.pub/assets/8b08ee612b7d247091f7de1740835832.png 1920w,https://asset.jmir.pub/assets/8b08ee612b7d247091f7de1740835832.png 2500w)
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