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It's probably because that's the only data they have that can serve as a proxy for fitness.
by guelo 11y ago
It's probably because that's the only data they have that can serve as a proxy for fitness.
- brandonb 11y agoYep—resting heart rate is a good proxy, and readily measurable from Apple Watch. A definitive study would randomly assign people to an exercise routine, follow them for 20-30 years, and then measure hard outcomes like heart attacks, strokes, and all-cause mortality. Since that's pretty challenging, all of the studies on exercise (and nutrition, for that matter) make two types of approximation: 1. analyze correlations in data rather than randomize, and/or 2. analyze proxy metrics like resting heart rate or blood pressure rather than hard endpoints. That's part of what makes research on health so complex!