Physiological and Performance Effects of Low- versus Mixed-Intensity Rowing Training
Ingham et al. ran a 12-week training study in experienced rowers comparing an all-low-intensity programme (LOW: 100% of training at or below lactate threshold) with a mixed programme (MIX: 70% at or below lactate threshold and 30% at "50%Δ", halfway between VO2 at LT and VO2peak).
Both programmes improved 2000-m ergometer performance and VO2peak by the same magnitude; LOW produced larger gains in power at lactate threshold and power at 4 mM lactate. This is an intervention trial, not an analysis of Olympic medalists' training logs.
Participants
n=18 experienced rowers, allocated to LOW or MIX training for 12 weeks.
Protocol
LOW: 100% of training ≤ lactate threshold (LT).
MIX: 70% of training ≤ LT, 30% at 50%Δ (halfway between VO2 at LT and VO2peak).
Tests pre and post: progressive exercise test to exhaustion; repeated 6-min square-wave transitions at 50%Δ (VO2 kinetics); maximal 2000-m ergometer time trial.
Key Results
2000-m ergometer performance and VO2peak improved (P < 0.001) in both groups, with no group difference (P = 0.8 and 0.42).
Power at LT: LOW +23.5 ± 12.2 W vs MIX +5.1 ± 5.0 W (P = 0.013).
Power at 4 mM blood lactate: LOW +32.3 ± 6.9 W vs MIX +13.1 ± 3.7 W (P = 0.03).
VO2 kinetics: time constant and gain of the primary component unchanged; slow-component gain reduced with training, independent of group.
Practical Application
In 18 experienced rowers, 12 weeks of training done 100% at or below lactate threshold improved 2000-m ergometer performance and VO2peak as much as a 70/30 mix with 30% of training at a high intensity, and raised power at lactate threshold more (+23.5 vs +5.1 W) and power at 4 mM lactate more (+32.3 vs +13.1 W).
A large low-intensity base is a legitimate way to move the lactate threshold in trained endurance athletes; adding 30% of training at hard intensity did not buy extra 2000-m performance over 12 weeks in this sample.
Inference, not tested: the trial did not test a polarized distribution (a small share of very high-intensity work), so it neither supports nor refutes polarized training; it argues against assuming that more hard work automatically means more performance.
Limitations
n=18, two groups; 12 weeks; no group did high-intensity work above 50%Δ, so the comparison is low vs moderate-high, not low vs polarized; the abstract does not describe the rowers' competitive level.
How this entry was checked and changed
Why this level
regraded 2026-09-27 from B+: parallel trial, n=18 (two groups of about 9)
Content correction 2026-09-27
Entry described an analysis of Olympic rowing medalists' training logs showing a 74% / 12% / 14% polarized distribution -> the paper is a 12-week intervention in 18 experienced rowers comparing 100% low-intensity training with a 70/30 low/high mix; the 74/12/14 figures do not exist in it. Title, summary, results and lead rewritten from the abstract.
"Validates the 14-week 75/10-15/10-15 polarized plan" -> deleted; not from this paper.
Level B+ -> B (parallel trial, n=18); Tier 5 -> Tier 2-3 (experienced rowers, no elite data in the abstract); Sport "cycling, running, rowing" -> rowing.
REF-079 was an empty stub and is now filled: it is a C+ narrative review (Hydren & Cohen 2015), so pointers for polarized-vs-other evidence now lead with the trial REF-303.