Key takeaways
A meta-analysis of 27 studies found the best taper lasts about two weeks and cuts volume by 41 to 60% while keeping intensity and frequency
Tapers typically improve performance by about 3%, through recovery rather than new fitness
VO2max does not fall during a normal taper and may rise, because two or three weeks is too short to lose much fitness
A taper is the planned reduction in training before a key race. Mujika and Padilla defined it as a progressive, nonlinear reduction of training load meant to reduce accumulated fatigue without losing the adaptations you built. Done well, it is one of the cheapest performance gains available. Done badly — too long, too short or with all the intensity removed — it leaves you flat on race day.
How to taper before a race: the evidence
The most cited analysis is a 2007 meta-analysis in Medicine & Science in Sports & Exercise by Bosquet, Montpetit, Arvisais and Mujika. Of 182 candidate studies, 27 met the criteria (competitive athletes, real competition or field performance). The best strategy was:
- About two weeks long
- Volume cut by 41–60%, reduced progressively rather than all at once
- No change in intensity and no change in training frequency
Mujika and Padilla's 2003 review gives wider ranges: volume cut by up to 60–90%, frequency reduced by no more than 20%, intensity kept, and a duration anywhere from 4 to more than 28 days. Progressive tapers beat abrupt "step" tapers, and performance usually improves by about 3% (typical range 0.5–6%).
A 2023 meta-analysis focused on endurance athletes (14 studies) confirmed gains in time-trial and time-to-exhaustion performance with a taper of up to 21 days that cut volume by 41–60% without changing intensity or frequency. Tapers that followed a deliberate overload block worked better than a conventional taper.
How to taper for a marathon
Recreational runners have their own large dataset. Smyth and Lawlor analysed the training of more than 158,000 recreational marathoners. Strict tapers, where weekly distance falls progressively, beat relaxed ones, and longer tapers of up to three weeks beat shorter ones. A strict three-week taper was linked with a median finish-time saving of 5 minutes 32 seconds (2.6%) compared with a minimal taper. Women gained more than men for a given taper type. And 64% of runners used a less disciplined taper, which suggests many leave time on the table.
| Weeks to race | Volume vs peak week | Intensity | Example (peak 70 km/week) |
|---|---|---|---|
| 3 | 80–85% | Normal key session | 56–60 km, last long run 26–30 km |
| 2 | 60–70% | Short race-pace work | 42–49 km, long run 18–22 km |
| 1 (race week) | 40–50% incl. race | A few short strides or race-pace km | 28–35 km before race day |
| Race day | — | — | Race |
For a 5 or 10 km race, compress this to 7–10 days. For a half marathon, about 10–14 days.
What to keep during a taper
- Intensity. The most consistent finding across reviews. Keep one or two short sessions per week at race pace or faster — for example 5 × 1 km at 10 km pace, or 3 × 3 km at marathon pace — just with fewer reps.
- Frequency. Keep roughly the same number of runs, even if each is shorter. This preserves rhythm and the feel of your race pace.
- Sleep and food. Mujika's 2004 review lists better sleep quality, lower mood disturbance and increased muscle glycogen among taper changes. Use the extra time to sleep (VO2max and sleep).
- Calm. Do not use a "good week" in the taper to test fitness with a hard workout.
Does VO2max drop during a taper?
No — and it may go up. Mujika, Padilla, Pyne and Busso reviewed the physiology of tapering and noted that changes may include an increase in maximal oxygen uptake, though a rise is not needed for the performance gain. Resting, maximal and submaximal heart rates generally do not change unless an athlete was overreached before the taper. Red cell volume and haemoglobin can rise, and muscle strength and power often increase markedly.
The 2023 endurance meta-analysis found no significant change in VO2max or running economy across the taper, even while performance improved. In other words, the taper works mainly by removing fatigue, not by building new aerobic capacity. That fits detraining research: noticeable VO2max losses take more than two or three weeks of near total rest, not a reduction in volume with intensity kept (detraining: how fast you lose VO2max).
Your watch may still show a lower VO2max estimate in taper week, because you run fewer hard efforts for the algorithm to work with (Garmin VO2max explained). That is a data artefact, not lost fitness.
Overload before the taper: how far to push
Many coaches put the hardest block three to five weeks before the race. A study by Aubry and colleagues in 33 trained triathletes tested this. After a three-week overload, the athletes who were only acutely fatigued gained more from the four-week taper than controls (by about 2.6%). Those who became functionally overreached — performance actually dropped — gained less, did not improve VO2max at peak and had more infections (70% versus 20% and 10%). Most peak performances came within the first two weeks of the taper.
The lesson: train hard before the taper, but not so hard that your performance and mood collapse. See overtraining syndrome signs for the warning signs.
Common taper mistakes
- Cutting intensity along with volume. You feel sluggish rather than fresh.
- Cutting frequency too much. Three runs a week instead of six makes your race pace feel strange.
- Cramming missed training into taper week. Fitness does not arrive in the last ten days; fatigue does.
- Panicking about phantom aches. Restlessness and niggles are common in taper week and usually fade.
- Ignoring the plan around it. A taper is the last phase of a periodised build (periodisation for endurance).
Use the VO2max running calculator to set realistic race paces from a recent result, and see VO2max workouts for short sessions that suit a taper.
Frequently asked questions
How long should you taper before a marathon?
Two to three weeks for most runners. In data from more than 158,000 recreational marathoners, strict three-week tapers were linked with a median finish-time saving of about 5 and a half minutes, or 2.6%, compared with a minimal taper.
How much should I reduce mileage during a taper?
Research supports cutting weekly volume by about 41 to 60% compared with your peak weeks, usually in steps, so the last week is the lightest. Keep the number of runs roughly the same.
Should I still do speed work during a taper?
Yes. Keeping intensity is the single most consistent finding. Short sessions at race pace or faster, with less total volume, help you stay sharp without adding fatigue.
Will I lose fitness during a taper?
No. Two or three weeks of reduced volume with some intensity is too short to lose meaningful aerobic fitness. Feeling sluggish or restless in taper week is common and usually passes by race day.
Sources
- Bosquet L, Montpetit J, Arvisais D, Mujika I. Effects of tapering on performance: a meta-analysis. Med Sci Sports Exerc, 2007. PubMed
- Mujika I, Padilla S. Scientific bases for precompetition tapering strategies. Med Sci Sports Exerc, 2003. PubMed
- Mujika I, Padilla S, Pyne D, Busso T. Physiological changes associated with the pre-event taper in athletes. Sports Med, 2004. PubMed
- Wang Z, Wang YT, Gao W, Zhong Y. Effects of tapering on performance in endurance athletes: a systematic review and meta-analysis. PLoS One, 2023. Full text
- Smyth B, Lawlor A. Longer disciplined tapers improve marathon performance for recreational runners. Front Sports Act Living, 2021. Full text
- Aubry A, Hausswirth C, Louis J, Coutts AJ, Le Meur Y. Functional overreaching: the key to peak performance during the taper? Med Sci Sports Exerc, 2014. PubMed