Polar H10 Heart Rate Sensor Review 2026: Still the Gold Standard for Triathletes?
Wrist-based optical heart rate has improved enormously, but it still lags a chest strap for accuracy during high-intensity intervals, cold-water swims and anything involving significant wrist or arm movement. Polar’s H10 has been the reference chest strap for years, and it remains one of the most recommended accuracy upgrades for triathletes serious about heart rate zone training.
Key Specs
- Connectivity — dual ANT+ and Bluetooth, connects simultaneously to a watch and an app or turbo trainer software
- Accuracy — ECG-grade heart rate measurement, widely used as the reference standard against which optical wrist sensors are benchmarked
- Waterproof — fully swimmable, one of the few heart rate sensors reliable enough for pool and open-water swim training
- Extras — internal memory stores one training session without a paired device, HRV data for recovery tracking, and a machine-washable strap
- Battery — user-replaceable coin cell, typically lasting 300+ hours of use
Why It Matters for Triathletes
Optical wrist sensors struggle specifically in the situations triathletes train in most — cold open water, a tight wetsuit sleeve, high-cadence swim strokes and hard interval efforts where blood flow to the wrist briefly drops. A chest strap sidesteps all of these failure modes, which matters if you’re structuring training around heart rate zones rather than pace or power. It’s also the only realistic way to get accurate heart rate data during a swim session, where a watch on your wrist under a wetsuit sleeve is often unreliable.
Buying Tips
- Typically around £70-77 UK — check current price as it fluctuates across retailers
- Wet the electrode strip before putting it on for a more reliable connection at the start of a session, especially in cold weather
- The strap comes in a single elasticated size range (roughly 75-115cm chest) — check the fit range before buying if you’re at either end of that scale
Care and Maintenance
Rinse the strap after every session, especially open-water swims, and machine wash periodically to stop sweat salt building up and irritating the skin. Replace the coin cell battery as soon as you notice connection dropouts rather than waiting for it to die completely mid-session.
See also our best heart rate monitors for triathlon guide and understanding heart rate zones.
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