Outcome
Performance in heat
Heat punishes ego pacing; you need acclimation and cooling strategy to execute.
What to do first
- • Practice pacing downshifts by temperature and humidity.
- • Consider heat acclimation blocks 10–21 days pre-race.
- • Use simple cooling tactics: cold fluids, ice, shade, and smart start pacing.
Top topic pages
Protocols + decision rules that move this outcome.
Study library (reference)
Studies that measured this outcome.
Prolonged Heat Acclimation and Aerobic Performance in Endurance Trained Athletes.
PMID 31749712 (2019): heat acclimation — Performance in heat (study note for endurance athletes).
The effect of medium-term heat acclimation on endurance performance in a temperate environment.
PMID 33241974 (2022): heat acclimation — Performance in heat (study note for endurance athletes).
Rehydration during Endurance Exercise: Challenges, Research, Options, Methods.
PMID 33803421 (2021): hydration, fluid — Time to exhaustion, Performance in heat, Cramp risk (study note for endurance athletes).
Nine-, but Not Four-Days Heat Acclimation Improves Self-Paced Endurance Performance in Females.
PMID 31156449 (2019): heat acclimation, heat stress — Performance in heat, Time-trial performance (study note for endurance athletes).
Proper Hydration During Ultra-endurance Activities.
PMID 30601394 (2019): hydration, sodium — Time to exhaustion, Performance in heat, Cramp risk (study note for endurance athletes).
Sports Dietitians Australia Position Statement: Nutrition for Exercise in Hot Environments.
PMID 31891914 (2020): heat acclimation, heat stress — Performance in heat, Time-trial performance (study note for endurance athletes).
Water and electrolyte requirements for exercise.
PMID 10410838 (1999): hydration, fluid — Time to exhaustion, Performance in heat, Cramp risk (study note for endurance athletes).
Consensus recommendations on training and competing in the heat.
PMID 26069301 (2015): consensus, recommendations — Performance in heat (study note for endurance athletes).
Considerations for ultra-endurance activities: part 2 - hydration.
PMID 30056755 (2019): hydration, sodium — Time to exhaustion, Performance in heat, Cramp risk (study note for endurance athletes).
Heat Acclimation with or without Normobaric Hypoxia Exposure Leads to Similar Improvements in Endurance Performance in the Heat.
PMID 35622478 (2022): heat acclimation — Performance in heat, Time-trial performance (study note for endurance athletes).
The effect of post-exercise heat exposure (passive heat acclimation) on endurance exercise performance: a systematic review and meta-analysis.
PMID 39762944 (2025): heat acclimation, sauna — Performance in heat, Time-trial performance (study note for endurance athletes).
Hydration Status and Sodium Balance of Endurance Runners Consuming Postexercise Supplements of Varying Nutrient Content.
PMID 25811075 (2015): hydration, sodium — Time to exhaustion, Performance in heat, Cramp risk (study note for endurance athletes).
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Performance Science Lab
Research-backed protocols and evidence grades for endurance performance — built for athletes.
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.
Prolonged Heat Acclimation and Aerobic Performance in… (PMID 31749712)
PMID 31749712 (2019): heat acclimation — Performance in heat (study note for endurance athletes).
The effect of medium-term heat acclimation on enduran… (PMID 33241974)
PMID 33241974 (2022): heat acclimation — Performance in heat (study note for endurance athletes).
Rehydration during Endurance Exercise: Challenges, Re… (PMID 33803421)
PMID 33803421 (2021): hydration, fluid — Time to exhaustion, Performance in heat, Cramp risk (study note for endurance athletes).
Nine-, but Not Four-Days Heat Acclimation Improves Se… (PMID 31156449)
PMID 31156449 (2019): heat acclimation, heat stress — Performance in heat, Time-trial performance (study note for endurance athletes).