Overtraining Signs for Runners: RHR, HRV, Performance, and When to Rest
Hard training creates fatigue; overreaching without recovery creates a hole. The conflict is interpreting tiredness: normal load vs a system that needs a brake. Don’t wait for a dramatic collapse — stack objective signals with how workouts feel. Cross-check resting HR, HRV, zones via HR Zones / Zone 2, and watch context in Garmin Training Status.
Red Flags Worth Acting On
- Resting HR up ≥5–7 bpm for several mornings
- HRV trending down for a week (same measurement conditions)
- Easy pace slower at the same HR, or HR higher at the same easy pace
- Interval paces fade early despite sleep and fueling
- Persistent irritability, insomnia, or lingering niggles
One rough day after travel is noise. A week of stacked flags is information. Illness, alcohol, and altitude also move RHR/HRV — read the week, not a single screenshot.
Numeric scenario: Baseline RHR 50, HRV (overnight) typically 65–75 ms. After stacking a race, a long run PR attempt, and two interval days in 10 days: RHR 57–59 for four mornings, HRV ~50 ms, and a planned tempo dies 20 sec/km slow by minute 15. Treat as functional overreaching — 5–10 days easy/off (volume −40–60%), no intensity, then rebuild. If metrics and mood don’t improve after two easy weeks, get medical input rather than “another recovery week” forever.
True overtraining syndrome is uncommon; short-term overreaching is common. Watches love the word “overreaching.” Believe clusters of signals lasting days — not one bad Body Battery after a wedding.
Decision rule: three or more red flags for ≥3 days → cancel quality sessions until easy running and morning metrics normalize near baseline. One bad night alone → easy day, not panic.
What To Do Instead of Grinding
Sleep, fuel, cut intensity first, then volume. Replace hero workouts with Zone 2 or rest. Resume intensity only after a normal easy run feels easy again.
Practical Takeaway
Overtraining is a pattern, not a vibe. Use RHR/HRV/performance together, rest hard when the cluster lights up, and return gradually.
FAQ
Is soreness overtraining?
No. Local muscle soreness after hills or strength is normal. Systemic fatigue plus performance drop plus sleep issues is the deeper problem.