Influence of Post-warm-up Recovery Time on Swim Performance in International Swimmers
Participants
n=8 international swimmers
Protocol
Randomised, counter-balanced crossover: after a standardised warm-up, swimmers rested for either 20 min or 45 min before a 200-m freestyle time trial
Rationale: swimmers must enter the marshalling call-room 20 min before racing, so some finish their warm-up 45 min pre-race
Core temperature (Tcore), blood lactate (BL), heart rate and RPE recorded at baseline, post-warm-up, pre-TT, immediately post-TT and 3 min post-TT
Key Results
200-m freestyle was 1.5 ± 1.1% faster after 20 min than after 45 min of recovery: 125.74 ± 3.64 s vs 127.60 ± 3.55 s (P = 0.01)
Tcore was similar after the warm-up in both conditions but higher pre-TT after 20 min (37.8 ± 0.2 vs 37.5 ± 0.2 °C, P = 0.002) — a 0.3 °C difference
Blood lactate did not differ between conditions before the TT (P > 0.05); after the TT it was higher in the 20-min condition, while Tcore was similar post-TT
Authors' conclusion: 200-m freestyle is faster 20 min post-warm-up than 45 min, probably because core temperature is better maintained; warm-up should be completed close to entering the call room
Mechanism
Inference (authors' interpretation): the 45-min wait let core temperature fall by about 0.3 °C relative to the 20-min condition, and the performance loss tracks that cooling; the higher post-TT lactate at 20 min suggests the swimmers could produce more anaerobic work when warmer. No time course of temperature decay is reported in the abstract.
Practical Application
In 8 international swimmers, finishing the warm-up 20 min before a 200-m freestyle TT instead of 45 min made the swim 1.5% faster (125.74 vs 127.60 s) and kept core temperature 0.3 °C higher at the start — end the warm-up as late as the call-room allows
Plan the warm-up backwards from the start time so that the warm-up ends ~20 min before racing, not 45
Not from this paper; the base's own practice: if a long delay is unavoidable, use passive warming (heated jacket, blankets) or a brief re-warm-up; for cycling, keep riding on a trainer through long call-up or marshalling waits
Transfer to cycling and running rests on the temperature principle only (Inference, not tested)
Limitations
Swimming-specific — transfer to cycling = temperature principle only
Only 20 min vs 45 min tested — other intervals not explored; small sample (n=8)
Warm-up content ("standardised") not described in the abstract
No DOI line in the entry; abstract verified via Europe PMC (PMID 22789310)
How this entry was checked and changed
Why this level
regraded 2026-09-27 from A-: randomised counter-balanced crossover, n=8 (<15)
Content correction 2026-09-27
Participants "n=international-level swimmers" -> n=8 international swimmers; "standard 1500 m warm-up" -> standardised warm-up (distance not in abstract).
"Core temperature drop ~0.5 °C" -> 37.8 vs 37.5 °C (0.3 °C); TT times added; "~50% of temperature elevation lost within 15-20 min, near-complete by 45 min" (not in abstract) removed.
Level A- -> B (crossover, n=8); Tier "mixed→4-5" -> 4; Sport "cycling, swimming" -> swimming; cycling advice relabelled as base practice.