Endurance exercise performance declines in hot environments as core body temperature increases. To enhance performance, body pre-cooling strategies, such as cold-water immersion have been employed to lower resting core temperature thereby increasing the body's heat storage capacity. In turn, the increase in body core temperature associated with exercise in the heat is blunted, allowing the individual to exercise at higher intensity and or for a longer period of time. However, the mechanisms by which pre-cooling impacts heat exchange during exercise remain unclear. While existing research has focused on the performance benefits of pre-cooling the body, relatively little is known about the impacts of pre-cooling on whole-body heat exchange during an exercise-heat stress. Investigators will therefore evaluate whole-body heat exchange (dry ± evaporative heat loss as assessed using a direct air calorimeter) during a prolonged (1-hour) moderate-intensity cycling bout in the heat (wet-bulb globe temperature of 29°C; equivalent to 37.5°C, 35% relative humidity) performed with and without pre-cooling by cool-water (\~17°C) immersion.
Age range
18 Years – 30 Years
Sex
MALE
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A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
Evaporative heat loss at end exercise
Timeframe: Final 15 minutes of the 60 minutes exercise bout
Dry heat loss at end exercise
Timeframe: Final 15 minutes of the 60 minutes exercise bout
Total heal loss at end exercise
Timeframe: Final 15 minutes of the 60 minutes exercise bout
Body heat storage during the 60-minute exercise bout
Timeframe: Over the 60 minute exercise bout
Core temperature at end of exercise
Timeframe: Final 15 minutes of exercise
Relative change in core temperature at end of exercise
Timeframe: Change over the 60-minute exercise bout
Heart rate at end exercise
Timeframe: Final 15 minutes of exercise
Mean skin temperature at end of exercise
Timeframe: Final 15 minutes of exercise
Relative change in skin temperature at end of exercise
Timeframe: Change over the 60-minute exercise bout
Thermal sensation A at end exercise
Timeframe: Final 15 minutes of exercise
Thermal sensation B at end exercise
Timeframe: Final 15 minutes of exercise
Thermal comfort at end exercise
Timeframe: Final 15 minutes of exercise
Thirst sensation at end exercise
Timeframe: Final 15 minutes of exercise
Rating of perceived exertion
Timeframe: Final 15 minutes of exercise