Not connected
RMSSD: -- ms
Mean HR: -- bpm
RR count (window): 0
Thresholds & window
Logic: RMSSD < Yellow → RED, Yellow ≤ RMSSD < Green → YELLOW, RMSSD ≥ Green → GREEN.
Notes
- Use Chrome/Edge over HTTPS (Cloudflare Pages is perfect).
- Wear your Polar H10 and moisten electrodes; keep strap snug.
- Click Connect, then pick your Polar from the browser prompt.