https://dev.fitbit.com/build/reference/web-api/heartrate-variability/get-hrv-summary-by-interval/ https://dev.fitbit.com/build/reference/web-api/heartrate-var..

https://dev.fitbit.com/build/reference/web-api/heartrate-variability/get-hrv-summary-by-interval/ https://dev.fitbit.com/build/reference/web-api/heartrate-var... I used the swagger interface a few months ago to download my resting heart rate over a three-year period, and it was interesting.