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Apple shares the data behind Apple Watch Series 12’s biggest health claim

2026-09-11 | original
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Why This Matters

Apple is backing its 'most accurate heart rate sensing in a wearable' marketing claim with a published nine-page study comparing Apple Watch Series 12 against rivals like Garmin, Pixel Watch 4, Samsung, WHOOP and Oura, using an ECG chest strap as reference. That's notable because wearable accuracy claims are usually unverifiable marketing, and it raises the bar for competitors to publish their own data. For consumers, heart rate accuracy underpins downstream features like Recovery HRV and Readiness, so the stakes go beyond a single metric.

Key Takeaways
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Apple makes a bold claim when it comes to Apple Watch Series 12 and Apple Watch Ultra 4. According to Apple, the new Health Sensing System on both watches “delivers the most accurate heart rate sensing in a wearable.” Apple backs up this claim with a new study that shows how Series 12 heart rate sensing compares to other leading wearables, including smart rings and fitness bands.

Health Sensing System is a major upgrade for Apple Watch

Apple Watch Series 12 and Apple Watch Ultra 4 are a major upgrade due to the Health Sensing System that drives many of the health and fitness features.

“With the release of Apple Watch Series 12 and Apple Watch Ultra 4, Apple introduced the Health Sensing System, which includes both updated electrical and optical (photoplethysmography, or PPG) heart sensors and associated signal processing algorithms, as well as several features enabled by the new technology, such as Recovery HRV and the Readiness app,” Apple explains.

How Apple tested Series 12

According to Apple’s nine-page study, testing took place across five sites in the US and Malaysia during July and August 2026. Apple enrolled 1,460 adults, with 1,254 contributing at least one paired measurement to the final analysis.

Participants wore Apple Watch Series 12 on one wrist and a competing wrist-based device on the other. A Polar H10 ECG chest strap served as the reference.

Apple compared Series 12 against the Garmin Forerunner 970, Google Pixel Watch 4, Huawei Watch 5, Samsung Galaxy Watch 8, and WHOOP 5. Participants also wore an Oura Ring 5 on an index finger, following Oura’s guidance.

The tests covered outdoor running, treadmill intervals, cycling, high-intensity interval training, and strength training. Apple also measured background heart rate during everyday activities including resting, desk work, meal preparation, and walking.

These scenarios included challenges such as rapid wrist movement, changing heart rates, and the “cadence lock” that can cause an optical sensor to mistake running rhythm for a pulse.

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Explore topics: apple watch series 12 apple watch ultra 4 health sensing system heart rate sensing google pixel watch 4
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