■野外消防员(WFF)在工作期间经常面临苛刻的物理和环境条件,例如高环境温度,具有挑战性的地形,重型设备和防护装备。这些条件会导致体温调节反应紧张,导致疲劳加剧,对他们的健康和安全构成风险。这项研究检查了在炎热环境中进行身体活动时两种冷却干预措施的有效性。
■八名活跃的男性WFF参加了比赛,比较穿着冷却背心(VEST)和个人防护装备拆除(被动式)对控制条件(PPE)的影响。参与者在热条件(30°C和30%相对湿度)下以6km·h-1的速度在跑步机上行走约75分钟。在最初的20分钟活动后,每15分钟引入增量斜率增加,每个增量之间有5分钟的被动恢复。在整个方案中监测生理和感知参数。
■在皮肤温度(PPE中36.3±0.2、36.2±0.4和35.4±0.6°C,被动式和VEST,分别),生理应变指数(PPE中5.2±0.4、5.6±1.1和4.3±1.4,PASSIVEandVEST)andthermalsensing(6.6±0.6,6.4±0.7and5.3±0.7inPPE,被动式,和VEST)。然而,降温策略对心率没有显著影响,胃肠道温度或表现。
■尽管观察到对生理反应的影响,在测试的实验条件下,两种冷却策略均未有效减轻WFF的热应变。
UNASSIGNED: Wildland firefighters (WFFs) regularly face demanding physical and environmental conditions during their duties, such as high ambient temperatures, challenging terrains, heavy equipment and protective gear. These conditions can strain thermoregulatory responses, leading to increased fatigue and posing risks to their health and safety. This study examined the effectiveness of two cooling interventions during physical activity in hot environments.
UNASSIGNED: Eight active male WFFs participated, comparing the effects of wearing a cooling vest (VEST) and personal protective equipment removal (PASSIVE) against a control condition (PPE). Participants walked on a treadmill at a speed of 6 km·h-1 for approximately 75-min under hot conditions (30°C and 30% relative humidity). Incremental slope increases were introduced every 15 min after the initial 20 min of activity, with 5-min passive recovery between each increment. Physiological and perceptual parameters were monitored throughout the protocol.
UNASSIGNED: Significant main effects (p < 0.05) were observed in skin temperature (36.3 ± 0.2, 36.2 ± 0.4 and 35.4 ± 0.6°C in PPE, PASSIVE and VEST, respectively), physiological strain index (5.2 ± 0.4, 5.6 ± 1.1 and 4.3 ± 1.4 in PPE, PASSIVE and VEST) and thermal sensation (6.6 ± 0.6, 6.4 ± 0.7 and 5.3 ± 0.7 in PPE, PASSIVE, and VEST). However, no significant effects of the cooling strategies were observed on heart rate, gastrointestinal temperature or performance.
UNASSIGNED: Despite the observed effects on physiological responses, neither cooling strategy effectively mitigated thermal strain in WFFs under the experimental conditions tested.