Firefighting is physically and mentally strenuous, requiring rapid, appropriate decision-making in hot environments. Intact cognitive function is imperative to firefighters' effectiveness and safety. The study purpose was to investigate the effect of hyperthermia and the effect of body cooling on sustained attention and response inhibition while wearing firefighters' personal protective ensembles after exercise in a hot environment. Twelve healthy males were recruited to participate in two randomly assigned exercise sessions (walking on a treadmill for 40 min at 40% [Formula: see text] O2max while wearing firefighter's protective ensemble) in a hot environment: control (no cooling) and intervention (cooling). For intervention sessions, a cooling garment was worn underneath firefighter's protective ensemble and infused with 18 °C water supplied by an external water circulator. Participants performed a computerized Go/No-Go (a measure of cognitive function) test three times at baseline and post-exercise for each experimental session. Participants completed baseline testing while wearing cotton athletic clothing. The exercise continued until the core temperature reached ∼39 °C (for all subjects regardless of cooling or non-cooling experimental sessions). Following hyperthermia, participants' physiological responses were significantly increased after exercise. Subjects' reaction time was significantly reduced (improved) after experiencing thermal strain and reaching hyperthermia. The cooling method had a significant impact on suppressing the physiological load, i.e., body cooling delayed the time to reach a Tc of 39 °C (p ≤ 0.05), but not cognitive inhibition and attention (reaction time and accuracy). Unexpectedly, hyperthermia resulted in shorter reaction time following exercise (16.64 ± 5.62; p < 0.03), likely influenced by increased attention/vigilance. Hyperthermia may trigger an acute increase in alertness, causing decreased reaction time.

中文翻译：

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在炎热环境中穿着消防员 PPE 时，持续冷却对抑制和注意力的影响。

消防工作需要体力和脑力，需要在炎热的环境中做出快速、适当的决策。完整的认知功能对于消防员的有效性和安全性至关重要。该研究的目的是调查高温和身体冷却对在炎热环境中锻炼后穿戴消防员个人防护服时持续注意力和反应抑制的影响。十二名健康男性被招募参加两个随机分配的锻炼课程（在跑步机上以 40% [公式：见文本] O2max 行走 40 分钟，同时穿着消防员的防护服）在炎热的环境中：控制（不冷却）和干预（冷却）。对于干预会议，消防员下面穿了一件冷却服 的保护套装，并注入由外部水循环器提供的 18 °C 水。参与者在每个实验阶段的基线和运动后进行了三次计算机化的 Go/No-Go（认知功能测量）测试。参与者穿着棉质运动服完成基线测试。练习一直持续到核心温度达到 ~39 °C（对于所有受试者，无论是冷却还是非冷却实验）。热疗后，参与者的生理反应在运动后显着增加。在经历热应变并达到高温后，受试者的反应时间显着减少（改善）。冷却方法对抑制生理负荷有显着影响，即 身体冷却延迟了达到 39 °C Tc 的时间（p ≤ 0.05），但没有认知抑制和注意力（反应时间和准确性）。出乎意料的是，热疗导致运动后反应时间缩短 (16.64 ± 5.62; p < 0.03)，这可能是受到注意力/警惕性增加的影响。体温过高可能会引发警觉性的急剧增加，从而导致反应时间缩短。