Potential data
Depending on the model, devices may provide activity, heart rate, heart-rate variability, sleep, temperature or other measures. Each field must be checked against the device documentation and the intended research use.
Important limitations
- Non-wear, charging and synchronisation gaps can distort a time series.
- Accuracy and proprietary algorithms differ by device and firmware.
- A deviation from personal baseline does not establish its cause.
- Regulatory status and intended medical purpose require a separate assessment.
A defensible protocol
Record the device and version, measured property, missing-data rules, feature algorithm, escalation rule and the person responsible for reviewing a signal. Reassess the pathway when the device or algorithm changes.