Pacing Adjustments Associated With Familiarization: Heat Versus Temperate Environments

Area of Science:

• Environmental Exercise Physiology
• Sports Science
• Human Performance

Background:

• Understanding the impact of environmental conditions on endurance performance is crucial.
• Heat acclimatization is a known strategy to improve exercise capacity in hot environments.
• The role of perceptual experience in modulating pacing during heat exposure requires further investigation.

Purpose of the Study:

• To investigate how initial perceptual experiences from heat familiarization affect pacing strategies during endurance time trials.
• To compare pacing profiles in hot versus temperate conditions.
• To determine if perceptual changes, rather than physiological acclimatization, influence performance.

Main Methods:

• Well-trained triathletes completed two 20-km time trials under either hot (35°C) or temperate (21°C) conditions.
• Training was standardized prior to trials, with trials separated by 11 ± 4 days to minimize physiological adaptation differences.
• Pacing profiles were analyzed to identify changes in strategy between the first and second trials.

Main Results:

• Performance improvements in the heat were comparable to temperate conditions.
• A significant shift in pacing strategy was observed in the heat, changing from a 'positive' to an 'even' pacing approach.
• The alteration in pacing profile in the heat differed markedly from that observed in temperate conditions.

Conclusions:

• Altered perceptions of heat, stemming from familiarization, may be key in modifying pacing and performance.
• Athletes lacking sufficient time for heat acclimatization should prioritize familiarization with hot environments.
• Familiarization can mitigate performance decrements by reducing behavioral uncertainty associated with heat exposure.