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ABSTRACT  To characterize the adaptive responses to short‐term heat acclimation (HA) training with repeated‐sprint exercises and to determine the effects of ice slurry ingestion during HA on aerobic capacity and adaptations. Seven physically active males completed two 5 consecutive day interventions in a randomized cross‐over design. Participants performed approximately 80‐min intermittent repeated‐sprints using a cycling ergometer including break‐time and half time in 36.5°C and 50%RH. Participants ingested either 1.25 g·kg body mass −1  of ice slurry (ICE: −1°C) or room temperature beverage (NOC: 36.5°C) throughout each break and 7.5 g·kg body mass −1  of the same drink during half time. Maximum oxygen uptake ( O2max) test in hot conditions was completed before and after HA training. Ice slurry ingestion during short‐term HA training induced significantly higher both  O2max and watt at  O2max following HA training. Total work done was significantly higher in HA with ICE than for the NOC trial on both day 1 and day 5. Sweating Na +  concentration in NOC trial at day 5 were significantly lower than those in the NOC trial day 1, but was not observed in ICE trial. Cooling during HA training may be an effective strategy for enhancement of aerobic capacity via the adaptations gained from a higher quantity of exercise caused by cooling, but does not improve heat loss capacity.   HighlightsThere is the potential dilemma whether cooling during short‐term training in the heat might negatively impacts the process of helping athletes adapt to hot environments.  Cooling during short‐term heat training may be an effective strategy to enhancement of aerobic capacity via the adaptations gained from a higher quantity of exercise caused by cooling, but does not improve heat loss capacity.  The study suggests the importance to selecting cooling during the heat acclimation phase of consecutive field training according to the individual's training plan.

Cooling during short‐term heat acclimation enhances aerobic capacity but not sweat capacity