Resting Heart Rate and Recovery: What Garmin, COROS, and Apple Watch Track
Your watch says you’re recovered; your morning pulse is +8 bpm. That conflict is why resting heart rate (RHR) still earns a place beside Body Battery and sleep scores. RHR is a simple trend metric — useful when measured consistently — while recovery dashboards blend many noisy inputs. Pair RHR with HRV, easy-day honesty via the Zone 2 Calculator and HR Zones Calculator, and the red-flag list in overtraining signs.
What the Brands Actually Show
- Garmin: overnight RHR averages, plus HRV status / Body Battery narratives
- COROS: overnight HR and recovery time estimates tied to training load
- Apple Watch: resting HR in Health, often from quiet daytime/overnight samples
Optical sensors are better at rest than during intervals, but sleep position, alcohol, and illness still swing numbers. Compare like with like: same device, similar wake time, weekly averages over single mornings.
Numeric scenario: Your 30-day RHR baseline is 52 bpm (range 50–54). After a hard block you see 58, 59, 57 on three consecutive mornings while easy pace at fixed HR is ~12 sec/km slower. Treat that as a recovery flag even if Training Readiness looks “yellow/green.” Take 2–3 easy/off days, then reassess. If RHR stays ≥5 bpm high for a week with flat performance, deload harder — don’t add another tempo “to stay sharp.”
RHR responds to training load, but also to heat, dehydration, caffeine timing, and stress. A single spike after a late dinner is weak evidence. A multi-day shift with worse easy-run economy is strong evidence.
Decision rule: RHR ≥5 bpm above your 30-day baseline for 2+ mornings and easy runs feel hard → no intensity that day. One isolated high reading with normal legs → proceed easy, recheck tomorrow.
Using RHR Without Obsession
Check mornings, log notes (alcohol, travel, illness), and ignore vanity screenshots. Fitness adaptations often lower RHR over months; short spikes after races are expected.
Practical Takeaway
Let RHR trend veto bad ideas when it agrees with how you feel. Dashboards are secondary to a stable personal baseline.
FAQ
Wrist or chest strap for RHR?
For true resting values, a still wrist reading or overnight average is fine. Save chest straps for training accuracy.