Recovery-guided marathon training

What the studies found

• Kiviniemi et al. (2007). 26 moderately fit men trained for four weeks. One group followed a fixed plan; another did high-intensity sessions only when their morning HRV was stable or rising, and easy runs or rest when it dropped. The HRV-guided group improved both VO₂ peak (from 56 to 60 ml/kg/min) and maximal running speed; the fixed-plan group improved running speed but not VO₂ peak significantly. The difference in VO₂ peak change between the groups was not significant, so this is a promising signal, not proof.
• Vesterinen et al. (2016). 40 recreational endurance runners trained for 8 weeks. The HRV group did moderate and hard sessions only when their 7-day rolling HRV average stayed inside their own normal range. They did fewer hard sessions (13.2 vs 17.7) and improved 3,000 m performance by 2.1 %, while the fixed-plan group's 1.1 % change was not significant. VO₂ max rose in both groups.
• Plews et al. (2013) argued, from work with elite endurance athletes, that a weekly rolling average of HRV is more reliable than single daily readings, which bounce around.
• Buchheit (2014) reviewed heart-rate monitoring and concluded that resting HRV and submaximal exercise heart rate are among the most useful tools, as long as changes are judged against the individual's own normal variation and the training context.

The common thread: compare yourself with yourself, look at trends rather than single mornings, and move the hard days rather than cancelling the plan.

Sleep: the signal everyone has

Adults aged 18 to 60 are advised to sleep 7 hours or more a night on a regular basis (Watson et al., 2015). A review of sleep and athletic performance found the research mixed, but the few studies in athletes reported lower sport-specific performance after sleep loss, and reaction and thinking were consistently slower and less accurate (Fullagar et al., 2015). In a small study of college basketball players, 5–7 weeks of extra sleep improved sprint times and free-throw and three-point shooting (Mah et al., 2011). You don't need a device to track it: note how many hours you slept and how rested you feel.

A simple daily method for marathon training

You need a chest strap or a reliable watch, and two minutes each morning.

1. Measure the same way every morning: after waking, before coffee, in the same position (lying or sitting). Note resting heart rate and, if your device shows it, HRV (often as rMSSD).
2. Build your normal range first. Collect 2–4 weeks of mornings during normal training. Vesterinen et al. used each runner's own 4-week mean ± 0.5 standard deviation of the 7-day average.
3. Watch the 7-day average, not one morning.
4. Before each key session or long run, decide:

5. Move, don't cram. If a key session drops out, do it later in the week only if the signals are back. Never do two hard days in a row to catch up.
6. Protect the long run, but shorten it when the signals are poor. Our rule of thumb: run 60–70 % of the planned distance, all easy.

Every plan on marathontraining.app has a simple green/amber/red version of this check built in.

The limits

• HRV is noisy. Alcohol, a late meal, a hot room or a bad measurement can all move it. That's why the trend matters more than one morning.
• Not every device measures the same way. Compare numbers only from the same device and routine.
• Signals can mislead. Readings can rise or fall for reasons that have nothing to do with training. If the numbers and how you feel disagree, be cautious and ask a coach.
• It is not a medical tool. A drop in performance that does not recover despite weeks of rest, often with mood changes, is the hallmark of overtraining syndrome and needs a doctor to rule out other causes (Meeusen et al., 2013). So are chest pain, dizziness or unusual breathlessness.

How a coach uses these signals

This is the way Flemming coaches. With Personal coaching – Train with Flemming, he reviews every session you log himself in the Everfit app, and adjusts your plan right away when your stress, your sleep or your training show it's needed, rather than waiting for the next weekly check-in. He knows the feeling of a plan that isn't working from his own years as an elite cyclist and now as a masters runner over 5,000 m and 10,000 m, and he holds the DCU Træner 1 and 2 coaching certificates. Personal coaching is $95 / £95 per month and the basic plan $45 / £45; both have a free first month and no commitment. Details on the coaching page.

Questions and answers

What is HRV-guided training?

Training where the timing of hard sessions depends on your morning heart-rate variability. When your HRV trend is within your normal range you train hard; when it drops, you run easy or rest.

Does HRV-guided training work for runners?

Studies are small but positive. In 40 recreational runners, the HRV-guided group did fewer hard sessions and still improved 3,000 m performance, while the fixed-plan group did not improve significantly (Vesterinen et al., 2016).

Should I skip a long run if my HRV is low?

Usually you shorten it and keep it easy rather than skip it. If HRV has been low for several days, you feel ill or you slept badly for several nights, rest.

Is resting heart rate as good as HRV?

It's simpler and still useful, especially compared against your own normal range. HRV picks up changes that resting heart rate can miss, but it is also noisier.

How much sleep do marathon runners need?

7 hours or more a night is the guideline for adults aged 18 to 60 (Watson et al., 2015). A small study found that extra sleep improved performance in college basketball players (Mah et al., 2011).

Sources

1. Kiviniemi, A. M., Hautala, A. J., Kinnunen, H. & Tulppo, M. P. (2007). Endurance training guided individually by daily heart rate variability measurements. European Journal of Applied Physiology, 101(6), 743–751. doi:10.1007/s00421-007-0552-2
2. Vesterinen, V. et al. (2016). Individual endurance training prescription with heart rate variability. Medicine & Science in Sports & Exercise, 48(7), 1347–1354. doi:10.1249/MSS.0000000000000910
3. Plews, D. J., Laursen, P. B., Stanley, J., Kilding, A. E. & Buchheit, M. (2013). Training adaptation and heart rate variability in elite endurance athletes: opening the door to effective monitoring. Sports Medicine, 43(9), 773–781. doi:10.1007/s40279-013-0071-8
4. Buchheit, M. (2014). Monitoring training status with HR measures: do all roads lead to Rome? Frontiers in Physiology, 5, 73. doi:10.3389/fphys.2014.00073
5. Watson, N. F. et al. (2015). Recommended amount of sleep for a healthy adult: a joint consensus statement of the AASM and SRS. Sleep, 38(6), 843–844 (recommendation for adults aged 18–60). doi:10.5665/sleep.4716
6. Fullagar, H. H. K., Skorski, S., Duffield, R., Hammes, D., Coutts, A. J. & Meyer, T. (2015). Sleep and athletic performance: the effects of sleep loss on exercise performance, and physiological and cognitive responses to exercise. Sports Medicine, 45(2), 161–186. doi:10.1007/s40279-014-0260-0
7. Mah, C. D., Mah, K. E., Kezirian, E. J. & Dement, W. C. (2011). The effects of sleep extension on the athletic performance of collegiate basketball players. Sleep, 34(7), 943–950. doi:10.5665/SLEEP.1132
8. Meeusen, R. et al. (2013). Prevention, diagnosis and treatment of the overtraining syndrome: joint consensus statement of the ECSS and the ACSM. Medicine & Science in Sports & Exercise, 45(1), 186–205. doi:10.1249/MSS.0b013e318279a10a

Related

• Heart-rate zones · Max heart rate by age · VO₂ max and marathon time · Personal coach
• On marathontraining.app: Marathon training plans · Marathon training over 50
• On RunPerform: Marathon taper and race week

Last updated: October 31, 2026. Written with AI assistance and checked against the sources above.