The purpose of this study was to evaluate upper-limb cooling following (treadmill) exercise performed in the heat (33℃, 70% relative humidity) at each of three speeds: light (6 km.h^–1), intermediate (8 km.h^–1) and moderate intensity (10 km.h^–1). In all trials, exercise ceased when rectal temperature reached 39.0℃. Participants adopted a sitting position for a 20-min recovery, and liquid-cooling sleeves with cold water (6.3℃ were immediately positioned. The chosen work rates resulted in a two-fold difference in exercise duration across those trials, which terminated without significant between-trial differences within either auditory canal or rectal temperatures. Auditory canal temperature elevation rates became progressively faster as the work rate increased: 0.03℃.min^–1 (light), 0.05℃.min^–1 (intermediate) and 0.07℃.min^–1 (moderate) (p<0.05). However, heat extraction during recovery did not differ among those treatments: –11.2 W (SE 0.5; light), –11.8 W (0.6; intermediate) and –12.3 W (0.5; moderate; p>0.05). That outcome was reflected in auditory canal cooling rates (0.03℃.min^–1 [light], 0.04℃.min^–1 [intermediate] and 0.05℃.min^–1 [moderate]). Nevertheless, rectal temperatures continued to rise throughout recovery. It is concluded that heat extraction from moderately hyperthermic individuals, using upper-limb cooling sleeves, appears to be equally rapid, regardless of heating speed, providing the same level of hyperthermia was attained prior to initiating treatment.

本研究的目的是评估在高温（33℃，70% 相对湿度）下以三种速度进行（跑步机）运动后的上肢冷却：轻 (6 km.h ^–1 )、中速(8 km .h ^–1 ) 和中等强度 (10 km.h ^–1）。在所有试验中，当直肠温度达到 39.0℃时停止运动。参与者采取坐姿进行 20 分钟的恢复，并立即放置冷水（6.3℃）的液冷套。所选的工作速率导致这些试验的运动持续时间有两倍的差异，在结束时没有显着差异- 耳道或直肠温度的试验差异。随着工作速率的增加，耳道温度升高速率逐渐加快：0.03℃.min ^–1（轻），0.05℃.min ^–1（中）和 0.07℃.min ^{– 1}（中等）（p<0.05）。然而，恢复过程中的热提取在这些处理之间没有差异：–11.2 W（SE 0.5；轻）、–11.8 W（0.6；中等）和–12.3 W（0.5；中等；p > 0.05）。该结果反映在耳道冷却速率上（0.03℃.min ^–1 [轻]、0.04℃.min ^–1 [中] 和 0.05℃.min ^–1 [中]）。尽管如此，在整个恢复过程中，直肠温度继续上升。得出的结论是，如果在开始治疗之前达到相同水平的热疗，使用上肢冷却套管从中度高热个体中提取热量似乎同样快，无论加热速度如何。