New research · 4 min read · 2026-10-11
Training by how recovered you are
Recreational runners who adjusted their training to heart rate variability and how they felt improved their 10K more than runners on a fixed plan.
Some days you wake up ready to train. Other days your legs are heavy and you slept badly. A fixed training plan doesn't know the difference. A Finnish study from 2022 looked at what happens when recreational runners adjust their training to how recovered they are.
What the researchers did
Thirty recreational runners trained for 15 weeks. One group followed a fixed plan. The other group had its plan adjusted twice a week, on Mondays and Thursdays, for the next three to four days.
The adjustment was based on three things: heart rate variability measured with a watch during the night, how tired and sore the runners felt, and how their heart rate compared with their running speed. If the signals looked good, training went up a little. If they looked poor, it went down.
What they found
Both groups got faster. The group that trained by recovery improved its 10K time by 6.2 percent on average. The group on the fixed plan improved by 2.9 percent.
How sure can we be?
It was a small study, and the runners adjusted on several signals at once, so we can't say how much came from heart rate variability alone. A review that pooled eight studies of training guided by heart rate variability found benefits for some physiological measures, but no clear overall gain in race performance. The idea is promising, but not proven.
What you can do now
You don't need special equipment to start. Notice how you feel before a hard session: heavy legs, poor sleep, unusual soreness. If several of those come together, it is reasonable to make the session easier or move it a day.
If you measure heart rate variability with your watch, look at the trend over several days rather than a single night, and only compare measurements taken the same way at the same time.
How we use it
PX7 Training asks how each session felt. If your watch measures heart rate variability at night, we follow the trend over several nights and compare it with your own normal range. When the signals point to poor recovery, the next sessions get easier.
Sources
- Nuuttila et al. (2022), Individualized endurance training based on recovery and training status in recreational runners. Medicine & Science in Sports & Exercise.
- Düking et al. (2021), Monitoring and adapting endurance training on the basis of heart rate variability monitored by wearable technologies. Journal of Science and Medicine in Sport.
Written by Jørgen Larsen for PX7 Training.