REF-1443 · Cove et al., 2025 · Journal of Science and Medicine in Sport · Paper · PubMed

Does the mix or more hours decide a trained cyclist's gains?

In 41 studies (797 riders) polarized vs non-polarized showed no significant difference, and volume no association. A null across studies, abstract only; no cap on hours.

Main caveat: Abstract only; the full paper is open access by licence but could not be read here, so the bias ratings, heterogeneity and study list are unknown.
fairly strong evidenceMeasured on trained to highly trained athletes

Cove and colleagues (University of South Australia) asked whether polarized or non-polarized training brings greater physiological and performance gains in cyclists. Interventions over 4 weeks in cyclists with VO2max of at least 59 mL/kg/min were sorted as polarized, non-polarized or unclear. Forty-one studies with 81 training groups and 797 participants qualified.

Across all groups training improved VO2max (g = 0.42, 95% CI 0.31-0.53) and time-trial performance (g = 0.39, 0.25-0.53), with no significant differences between modalities (P > 0.05). Longer interventions gave larger gains for both. No association was found between weekly or total training volume and the change in either outcome.

The authors conclude that the modalities give comparable gains and that "beyond achieving a necessary training volume, further increases do not appear to enhance performance". Our reading: the first cycling-only pool in the base, and it joins REF-1213 (A-), REF-991 (A-) and REF-1229 (A-) in finding no clear winner among distributions.

"Comparable" is the authors' word for a non-significant difference; the abstract does not show equivalence. The volume null comes from a meta-regression across groups and studies (the abstract gives no within-study test): programmes with more hours did not report larger gains, which is not the same as one rider adding hours and gaining nothing.

"A necessary training volume" has no number in the abstract.

Protocol

Eligibility: at least recreationally trained cyclists (VO2max at or above 59 mL/kg/min); interventions longer than 4 weeks; categorised as polarized, non-polarized or unclear.
Sample: n = 797 in 81 training groups from 41 studies.
Analysis: multilevel random-effects meta-analysis with restricted maximum likelihood; multivariate meta-regression of training volume on VO2max and time-trial change.
Not in the abstract: search dates, registration, risk of bias, heterogeneity, design mix of the included studies, volume range, whether effects are pre-post within groups (the reported g values are for training across all groups).
Funding and interests: the PubMed record states no conflicts of interest; funding is not stated in the abstract record.

Key Results

OutcomeAll groups, g (95% CI)Between modalitiesLonger intervention, g (95% CI)Weekly or total volume
VO2max0.42 (0.31-0.53), P ≤ 0.001no significant difference (P > 0.05)0.03 (0.02-0.05), P < 0.001no association
Time trial0.39 (0.25-0.53), P ≤ 0.001no significant difference (P > 0.05)0.04 (0.03-0.06), P < 0.001no association
Unit of the duration effect is not given in the abstract.

Mechanisms

Measured: gains in VO2max and time trial across all groups, no detectable difference by category, longer interventions larger gains.
Authors' interpretation: distribution and total volume beyond some necessary amount matter less than coaches assume; athletes should "prioritize effective training distribution rather than fixating on total volume or a specific model".
Inference: a three-way label cannot isolate the effect of time between the thresholds, and a volume regression across groups and studies is exposed to confounding by training status and study length.

Practical Application

Does the mix or more hours decide a trained cyclist's gains? In 41 studies (797 riders) polarized vs non-polarized showed no significant difference, and volume no association. A null across studies, abstract only; no cap on hours.
For a time-limited rider: this gives no support to "more easy hours will surely add more", and no trial evidence that fewer hours are enough either. Not from this paper; the base's own practice for 5-8 h a week is two quality sessions (SYNTH-26), and REF-1446 (B) is the direct test of adding easy riding, over 6 weeks.
For the distribution choice: the label is not the decision; see the wider pools REF-1213 (A-) and REF-991 (A-).
What it does not show: that tempo or threshold work is as good as intervals (the "non-polarized" bin is not broken down in the abstract), equivalence of any kind, what happens over years, or anything for riders below the entry bar. It tests no sweet-spot format and the abstract does not use the term.

Limitations

Abstract only; the full paper is open access by licence but could not be read here, so the bias ratings, heterogeneity and study list are unknown.
A null is not equivalence; the abstract gives no difference estimate between modalities.
Volume regression across groups and studies; not a test of adding hours within an athlete.
Category labels do not separate threshold-dominant, pyramidal or other programmes in the abstract.
Entry bar (VO2max at or above 59) excludes many amateur riders.
Funding: not stated in the abstract record; no conflicts declared.
How this entry was checked and changed
Why this level

(from the abstract) — an SR/MA in the rubric's A- line (small samples: 797 across 81 groups, our arithmetic about 10 per group), with the abstract giving no risk-of-bias rating, heterogeneity statistic or registration