HRV: measuring your recovery

HRV (heart rate variability) is one of the best indicators of your recovery. More and more watches measure it — you just need to know how to read it.

What is HRV?

HRV measures the micro-variations in time between two heartbeats. Counter-intuitively, the higher and more stable it is, the better: this reflects a well-balanced nervous system, ready to handle training. A drop in HRV signals stress (fatigue, lack of sleep, illness, overload).

How to use it

What matters is not the absolute value (very individual) but the difference from your baseline (your average over ~1 month):

• HRV within your normal range → green light to train as planned.
• HRV notably lower (for several days) → fatigue signal: lighten up, focus on easy endurance or recovery.

Combine it with your resting heart rate (which increases when you're tired) and your sleep for a reliable picture.

The trap: overreacting to a single number

A bad night, a glass of wine, a late meal can fluctuate HRV: don't change everything for one low value. Look at the trend over several days, and always cross-reference with how you feel.

HRV and progression

HRV helps you push hard when you're ready, and hold back when your body needs it. It's a safeguard against overtraining — the #1 cause of stagnation in motivated amateurs (combined with CTL/ATL/TSB).

Your coach monitors these signals

Sports Coach AI reads your HRV, resting heart rate and sleep (via Intervals.icu/Garmin) and automatically lightens your week if signals turn red — so you train hard when you need to, and recover when you need to.