Fitbit Charge 2

Summary

Fitbit Charge 2 is a wearable sleep tracker that provides an estimation of sleep time, as well as sleep stages: “light” sleep, “deep” sleep, and REM sleep by utilizing heart rate, movement, and proprietary algorithms. One validation study demonstrated promising results in detection of REM sleep and wake after sleep onset, but with limitations particularly in detection of stage N3 sleep. There are no data available regarding accuracy in clinical populations (sleep or medication conditions), adolescents, or older adults.

Claimed Capabilities/Measurements

Fitbit Charge 2 claims to track sleep and sleep stages. It provide tips and advice for improvement of sleep. The devices claims to assess wake, “light”, “deep”, and rapid eye movement sleep.

Mechanism

Fitbit Charge 2 measures motion and heart rate (including heart rate variability), in conjunction with proprietary algorithms.

Sensors

Accelerometer, photoplethysmography

Technical Considerations

Uses Bluetooth to synchronize data with computers and mobile devices

Publications

de Zambotti et al, 2017, Fitbit provides a publications page on their website: https://www.fitabase.com/research-library.

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Originally posted on Fitbit Charge 2 via Dental Sleep Medicine News