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To reduce the risk of heat-related illness, appropriate body cooling strategies are needed during men’s lacrosse competitions in hot-humid environments. The current study investigated whether additional in-play cooling breaks would attenuate the core (rectal) body temperature rise during exercise designed to mimic the activity patterns of a men’s lacrosse match while wearing uniform in hot-humid environments. In randomized and counterbalanced order, ten physically active men completed two experimental trials comprising four quarters of 15-min intermittent cycling exercises separated by a 10-min simulated half-time break and two 2-min quarter breaks in a climate chamber (35°C, 50% relative humidity). The two trials included a regular simulated match condition (REG) and a water break time out condition (WBTO) that included additional 2-min breaks 7.5-min into each quarter. Rectal temperature was significantly lower (p=0.017) in the WBTO condition (38.23±0.23°C) compared with the REG condition (38.50±0.46°C) at the end of the 4th quarter. In addition, ratings of perceived exertion, thermal sensation, heart rate and the physiological strain index were significantly lower (all p&lt;0.05) in the WBTO condition compared with the REG condition. The current results indicated that, even when wearing lacrosse uniforms, the implementation of WBTO attenuated the core body temperature elevation only in the latter stages of an intermittent cycling exercise protocol designed to mimic the exercise pattern of a men’s lacrosse match. Therefore, WBTO may provide a feasible and effective cooling strategy for lacrosse players to reduce the risk of heat-illness.

Addition of in‐Play Cooling Breaks During Intermittent Exercise while Wearing Lacrosse Uniforms in the Heat Attenuates Increases in Rectal Temperature