Polarised and pyramidal intensity distributions produce similar endurance performance gains; keeping most training easy and avoiding threshold-dominated weeks matters more than the exact split
Interpretation
Two recent pooled analyses agree there is no meaningful time-trial difference: an individual-participant network meta-analysis of 348 athletes (296 M, 52 F) found no polarised vs pyramidal difference in VO2peak or time trials (Rosenblat 2025), and a meta-analysis of 437 participants found a small VO2peak advantage for polarised training (SMD 0.24), mainly in highly trained athletes and blocks under 12 weeks, with no time-trial difference (Oliveira 2024). Earlier small trials favoured polarised over threshold-heavy training (Stöggl 2014, 48 athletes; Neal 2013, 12 male cyclists); in 30 recreational runners the polarised advantage was not significant (Muñoz 2014); in 60 male runners all distributions worked and pyramidal-then-polarised did best (Filipas 2022). Gaps: mostly men, short interventions, few triathletes, heart-rate time-in-zone measurement.
Practical implication
Keep most training easy across all three sports, include one or two genuinely hard sessions a week, use steady work deliberately rather than by default, and consider shifting from a pyramidal base towards more high-intensity work as races approach. The exact percentages matter less than consistency; evidence is from single-sport athletes, mostly men.
Sources
6 sources, independently verified.
Individual-participant-data network meta-analysis. Polarised vs pyramidal: no significant difference in VO2peak (SMD -0.06) or time-trial performance (SMD -0.05); no significant differences vs threshold, high- or low-intensity models (small groups). For VO2peak, competitive athletes trended towards polarised and recreational athletes towards pyramidal; the moderation was significant but neither within-group trend was. Study length and sport did not moderate effects. Mostly men; interventions 3-21 weeks.
Polarised training gave a small VO2peak advantage over other distributions (SMD 0.24, 95% CI 0.01-0.48) but no difference in time-trial performance (SMD -0.01), time to exhaustion or threshold speed/power. The VO2peak advantage appeared in interventions under 12 weeks (SMD 0.40) and in highly trained or national-level athletes (SMD 0.46), not in longer interventions or trained/developmental athletes; these subgroups overlap.
Nine weeks of four intensity distributions. Polarised (68% low, 6% threshold, 26% high) improved VO2peak 11.7% and power/speed at 4 mmol/L 8.1%; HIIT improved VO2peak 4.8%. The threshold-dominated group (54% at threshold) showed no significant change in VO2peak, peak power/speed (+1.8%) or power/speed at 4 mmol/L (+1.4%), and had the most dropouts. Small mixed groups; lab outcomes only.
Two 6-week blocks separated by 4 weeks of detraining: polarised (about 6.4 h/week; 80% low, 20% high) vs threshold (about 7.5 h/week; 57% low, 43% moderate). 40 km time trial improved 8% vs 3%, lactate-threshold power 9% vs 4%, time to exhaustion at 95% of maximal work rate 85% vs 37%. Small, all-male, short; threshold block had more hours.
10 weeks of polarised (77/3/20% across three zones) or between-thresholds (46/35/19%) training. 10 km time improved 119 s (5.0%) vs 84 s (3.6%); the difference between groups was not statistically significant. A post hoc adherence subset favoured polarised training.
16 weeks at constant training load: pyramidal, polarised, pyramidal then polarised, or polarised then pyramidal. All improved endurance markers and performance; pyramidal followed by polarised improved most (relative VO2peak about 3.0%, lactate-threshold speed 1.5%, 5 km time trial 1.5%). All-male.