Study note • PMID 40393849
Pre-cooling alters pacing profiles resulting in no additional benefit to 20-km self-paced maximal cycling time-trial performance in heat acclimated endurance athletes.
Low risk + high feasibility for most athletes.
ELI5
In plain language
To examine the effect of pre-cooling (PreC) on cycling time-trial (CTT) performance in heat, before and after heat acclimation (HA). (randomized trial; trained triathletes).
The abstract doesn’t indicate a clear change in Performance in heat, Time-trial performance under the tested conditions. Treat this as a signal, not a guarantee; confirm methods and context in the full paper.
Takeaways
What the abstract suggests
- • Study question: To examine the effect of pre-cooling (PreC) on cycling time-trial (CTT) performance in heat, before and after heat acclimation (HA).
- • The abstract doesn’t indicate a clear change in Performance in heat, Time-trial performance under the tested conditions.
- • Population: trained triathletes.
- • Protocol cues (title/abstract): 60 min • 30 min • 5 km.
Protocol
Protocol (as reported)
- • Intervention/exposure: heat acclimation, heat stress (vs comparison group).
- • Dose/time/duration cues in abstract/title: 60 min • 30 min • 5 km.
- • Outcomes: Performance in heat, Time-trial performance.
- • Replication note: abstracts often omit adherence and timing; confirm details before changing training or supplementation.
Fit
Who it helps, and who should skip it
Who it helps
- • Athletes similar to the study population (trained triathletes) working on heat.
- • Athletes who can measure Performance in heat, Time-trial performance with a repeatable workout or time-trial effort.
Who should skip
- • If you have symptoms or conditions that make the intervention risky, get professional guidance.
- • If you’re near race day and can’t safely test, defer the experiment.
Methods
What the study actually did
- • Design: randomized trial.
- • Population: trained triathletes.
- • Comparator: comparison group.
- • Outcomes measured: Performance in heat, Time-trial performance.
- • Protocol cues mentioned: 60 min • 30 min • 5 km.
- • Source: PubMed PMID 40393849 (2025) — Journal of science and medicine in sport.
Results excerpt
What the abstract reports
“Split times were faster in the first 12.5 km of the CTT in PostHA+PreC but slower across the rest of the CTT compared to PostHA-CON (b = -1.224 [-2.196, -0.157]).”
Note: excerpts are short; for full context, read the paper.
Limits
Limitations & bias
- • Abstract-only summaries can miss critical details (population, protocol, adherence, and context).
- • Single studies often don’t generalize to your event, history, and training load; treat results as a starting point.
- • If your context differs (elite vs recreational; cycling vs running), adjust expectations and be conservative.
- • This is performance information, not medical advice.
Coaching beta
Get a plan that adapts to your life.
Join the 26weeks.ai TestFlight beta for adaptive coaching, recovery-aware adjustments, and race-week reminders.
Keep going
Performance Science Lab
Research-backed protocols and evidence grades for endurance performance — built for athletes.
Heat performance research
Heat changes pacing, hydration, and fueling — and it can be trained like altitude with fewer logistics.
Heat acclimation: a protocol you can actually execute
Evidence-informed protocol: Heat acclimation: a protocol you can actually execute. Practical steps, who it helps, and what to watch out for.
Performance in heat research for endurance athletes
Heat punishes ego pacing; you need acclimation and cooling strategy to execute.
Time-trial performance research for endurance athletes
Practical performance outcome used in many studies: closer to racing than lab-only metrics.