Should I bring my wearable data to my cardiology appointment?

Yes, with preparation. Raw data is less useful than organized data. Before a cardiology appointment, export a 30-to-90-day trend summary covering: resting heart rate week-by-week average, HRV week-by-week average, sleep duration nightly average, any alerts with specific dates and the time of occurrence. Most apps can export this in a graph format or as a PDF. The Apple Health app exports to PDF directly.

What I find most useful from wearable data: sustained directional trends (a resting heart rate that has risen from 53 to 64 bpm over six months is far more informative than a single reading of 64), any alerts with dates (so I can correlate with your symptom history), and HRV in relationship to known stressors (illness, travel, heavy training weeks). What I cannot use: single data point extremes, uncontextualized scores, or device-specific "readiness" or "recovery" numbers that mean different things across platforms. The raw physiological measurements, heart rate, HRV, sleep duration, translate across devices. The branded scores do not. (Apple Health export function, https://support.apple.com/en-us/111788)

Cardiologist's calibrated position, Solid (1) for organized trend data as a useful clinical supplement. Not as a substitute for the clinical examination and the biomarker panel.

What to do: Spend 20 minutes before your next cardiology visit exporting trend data. Annotate any periods where you felt unusually fatigued, had palpitations, or had significant life stressors. Context is what turns a graph into a clinical story.

For the full picture, read What Your Apple Watch Is Trying to Tell You.