The speaker explicitly acknowledges that zone estimates provided by Apple Watch and similar wearable devices are estimates, not precise measurements, and should be understood as approximations rather than precise physiological data.
factualpending
Speaker
Unidentified Speaker — Low-intensity & high-intensity cardiovascular training for … [6MVSUuMkELQ]Evidence Quote
“my Apple watch is is you know beaming my heart rate and my zones um on to my screen which is kind of they're all estimated of course”
Source
Low-intensity & high-intensity cardiovascular training for longevity | Rhonda Patrick & Peter Attia— Peter Attia MDCreated: 8/12/2026, 2:27:11 AM
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