REF-821 · Smyth & Lawlor, 2021 · Frontiers in Sports and Active Living, Vol. 3, article · Paper · PubMed

Longer Disciplined Tapers Improve Marathon Performance for Recreational Runners

B+moderate evidenceMeasured on recreational to trained athletesWritten before October 2026, being re-checked

The authors analysed the training activities of more than 158,000 recreational marathon runners and defined tapers by the fall in weekly distance before race day. Tapers were typed by duration (1-4 weeks of decreasing training) and discipline (strict tapers progressively decrease training each week; relaxed tapers do not).

Strict tapers were associated with better marathon performance than relaxed tapers, and longer tapers of up to 3 weeks with better performance than shorter ones. Strict 3-week tapers were associated with the largest benefit: a median finish-time saving of 5 min 32.4 s (2.6%) compared with a minimal taper.

Female runners were associated with greater finish-time benefits than men for a given taper type (up to 3 weeks). Most runners (64%) used less disciplined 2-week and 3-week tapers.

Participants

More than 158,000 recreational marathon runners, identified from their logged training activities. The abstract does not give ages, the male-female split or the races.

Protocol

Taper defined as a decrease in training volume (weekly distance) in the weeks before the marathon.
Taper types combined duration (1-4 weeks of decreasing training) with discipline: strict (training progressively decreases each week) vs relaxed (it does not).
Runners grouped by taper type; popularity and finish-time outcomes compared.
Statistics: Kruskal-Wallis tests with post-hoc Dunn's tests (Bonferroni correction); Mann-Whitney U tests for sex comparisons.

Key Results

Strict tapers were associated with better marathon performance than relaxed tapers (p < 0.001).
Longer tapers of up to 3 weeks were associated with better performance than shorter tapers (p < 0.001).
Strict 3-week taper: median finish-time saving of 5 min 32.4 s, or 2.6%, compared with a minimal taper (p < 0.001).
Female runners were associated with greater finish-time benefits than men for a given taper type of up to 3 weeks (p < 0.001).
64% of runners adopted the less disciplined 2-week and 3-week tapers.
Omnibus test: H(7) ≥ 521.11, p < 0.001.

Practical Application

In more than 158,000 recreational marathon runners, a strict taper — weekly distance cut a little further each week — over 3 weeks went with the biggest finish-time advantage, a median 5 min 32.4 s (2.6%) faster than a minimal taper, and strict tapers were associated with better performance than relaxed ones overall. Taper for about 3 weeks, and make each week lighter than the one before; do not let a mid-taper week creep back up.
The discipline matters as much as the length: most runners (64%) tapered in a less disciplined way, so the gain is available simply by keeping the cut progressive.
Women were associated with larger benefits from the same taper; inference, not tested here: a female runner has at least as much reason as a male runner to taper strictly.
Weekly distance was the only thing measured. Not from this paper; the base's own practice: cut the volume and keep the hard sessions, shortened, as in SYNTH-34 and REF-107; this dataset cannot say whether intensity was kept.

Limitations

Observational: runners chose their own tapers, and fitter or more organised runners may both taper strictly and race faster.
Taper defined by weekly distance only; intensity, session type and frequency are not captured.
Logged training data may be incomplete (unlogged runs, other sports).
The abstract does not give the comparison group's definition in detail ("minimal taper") or effect sizes for each taper type.
Written from the abstract and record metadata only (full text not read).
How this entry was checked and changed
Why this level

very large observational cohort; taper type was self-selected, so the association is not proof that the taper caused the faster time