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Field notes · 21 October 2026
Wearables and the truth: what the 2025 validation studies say
Independent studies in 2025 measured consumer rings and watches against ECG, polysomnography and laboratory VO2max. Some readings are close to the reference and some are far from it, which is why every number a wearable shows should carry its own grade.
Field notes · 21 October 2026
Measuring a body
Wearables report some things well and others badly, and every reading carries noise. The question that matters is whether a change you made is working for you, and that can only be answered on your own measurements, at your own measurement error.
