Published on in Vol 9, No 5 (2021): May
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/23411, first published
.
![Use of Fitbit Devices in Physical Activity Intervention Studies Across the Life Course: Narrative Review Use of Fitbit Devices in Physical Activity Intervention Studies Across the Life Course: Narrative Review](https://asset.jmir.pub/assets/c95aa09990ae8f93cbfd8505a0f4ea5e.png 480w,https://asset.jmir.pub/assets/c95aa09990ae8f93cbfd8505a0f4ea5e.png 960w,https://asset.jmir.pub/assets/c95aa09990ae8f93cbfd8505a0f4ea5e.png 1920w,https://asset.jmir.pub/assets/c95aa09990ae8f93cbfd8505a0f4ea5e.png 2500w)
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