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YouTubeDr Cailbhe Doherty
Apple Watch Accuracy: VO₂ Max & Calorie Estimates—What the Data Shows
The Apple Watch can measure heart rate, SpO₂, ECG, and even estimate VO₂ max — but how accurate are some of its more complex physiological metrics? Across eight validation studies, energy expenditure showed the largest errors, with mean absolute percentage errors often exceeding 20%, and in some cases surpassing 100% depending on the ...
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