Chest Straps vs Optical — What’s the Difference?
Chest HRM straps measure electrical heart signals (ECG principle) — this is the most accurate method. Optical sensors use light to measure changes in blood flow — more convenient, but less accurate, especially during interval training. The difference can be up to a 5-10 k/min lag during sudden changes.
📊 TOP HRM Straps Comparison
| Model | Price | Battery | Memory | ANT+/BLE | For Swimming |
|---|---|---|---|---|---|
| Polar H10 | €80-90 | Replaceable (400 hrs) | 1 workout | ✅ Both | ❌ |
| Garmin HRM-Pro Plus | €120-130 | Replaceable (1 yr) | Internal (running dynamics) | ✅ Both | ✅ |
| Wahoo TICKR X | €80-90 | Replaceable (500 hrs) | 50 hrs internal | ✅ Both | ❌ |
| Coospo H808S | €30-35 | Replaceable | ❌ | ✅ Both | ❌ |
| Polar Verity Sense | €90-100 | Rechargeable (30 hrs) | 600 hrs internal | ✅ Both | ✅ |
🎯 Which One to Choose?
🥇 Most Accurate
Polar H10 — the gold standard. Used in scientific research, ECG accuracy.
🏊 For Swimmers
Garmin HRM-Pro Plus or Polar Verity Sense (on the temple). The only ones that work in water.
🪙 Budget
Coospo H808S (€30) — surprisingly accurate, supports ANT+ and BLE. A great starter.
⌚ Optical Alternative
Polar Verity Sense — worn on the upper arm or temple. Optical, but more accurate than wrist sensors.