Resting heart rate and early signs you need a rest day
Resting heart rate often climbs when recovery load is high. How Early Signal uses RHR as a supporting signal.
Last reviewed 2026-09-20 · Sources · Editorial policy
01Personal RHR beats generic charts
A normal RHR chart is too wide to catch early personal change. Median/MAD baselines keep your usual range honest without overreacting to one night.
02Support role in the five-signal set
RHR pairs with HRV as heart support. Temperature and breathing lead when present. Sleep provides context for whether a night looks restorative.
03Context holds
Hard workouts and travel can push RHR up for mundane reasons. Optional context and holds can show Explained by context for generic patterns (status in-app, no push)—except when temperature-led Off from usual takes priority.
Guide FAQ
01Why is RHR required for a verdict?
Sources
Public documentation cited as context—not as clinical validation of Early Signal.
- Apple — Track your overnight vitals with Apple Watch
- Quer et al., 2021 — Wearable sensor data and self-reported symptoms for COVID-19 detection (Nature Medicine). Background research, not a diagnosis.
- Mishra et al., 2020 — Pre-symptomatic detection of COVID-19 from smartwatch data (Nature Biomedical Engineering). Background research, not a claim that Early Signal detects disease.
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