Comparison of two cool vests on heat-strain reduction while wearing a firefighting ensemble
Comparison of two cool vests on heat-strain reduction while wearing a firefighting ensemble
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穿着消防服时两种凉爽背心减少热应变的比较
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
D. Cain
中科院分区：
文献类型：
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作者：
B. Bennett;R. Hagan;K. Huey;C. T. Minson;D. Cain
这项研究评估了六件装与四件装凉爽背心在减少穿着消防套装的男性热疲劳方面的有效性，同时在温暖/潮湿的环境[34.4°C（日球），28.9°C（湿球）]中休息和锻炼。男性志愿者（n = 12）进行了监测直肠温度（Tre），平均皮肤温度（Tsk），心率和能量消耗在三个测试试验：控制（无凉爽背心），四包背心，六包背心。凉爽的背心穿在消防队员的衣服下面，穿在海军的帆布鞋上面。方案包括两个周期，30 min坐位休息和30 min在电动跑步机上行走（1.12 m · s-1，0%等级）。对照试验的耐受时间（93分钟）显著小于两种背心试验（120分钟）。在整个热暴露过程中，休息和运动时的能量消耗有所不同，但各试验间差异不显著（P > 0.05）。在第一个60分钟的热暴露，生理反应是相似的四包和六包背心。然而，在第二个60分钟的热暴露的六包背心有更大的影响，减少热应变比四包背心。与四件装[38.6（0.4）° C和38.1（0.5）°C]和对照组[38.9（0.5）°C和38.4（0.5）° C]相比，6件装背心在热暴露结束时的峰值Te和Tsk [平均值（SD）38.0（0.3）° C和36.8（0.7）° C]显著更低。我们的研究结果表明，六件装背心比四件装背心更有效地减少热应变，并提高穿着消防服的人员的表现。
This study evaluated the effectiveness of a six-pack versus a four-pack cool vest in reducing heat strain in men dressed in firefighting ensemble, while resting and exercising in a warm/humid environment [34.4°C (day bulb), 28.9°C (wet bulb)]. Male volunteers (n = 12) were monitored for rectal temperature (Tre), mean skin temperature (Tsk), heart rate, and energy expenditure during three test trials: control (no cool vest), four-pack vest, and six-pack vest. The cool vests were worn under the firefighting ensemble and over Navy dungarees. The protocol consisted of two cycles of 30 min seated rest and 30 min walking on a motorized treadmill (1.12 m · s−1, 0% grade). Tolerance time for the control trial (93 min) was significantly less than both vest trials (120 min). Throughout heat exposure, energy expenditure varied during rest and exercise, but no differences existed among all trials (P > 0.05). During the first 60 min of heat exposure, physiological responses were similar for the four-pack and six-pack vests. However, during the second 60 min of heat exposure the six-pack vest had a greater impact on reducing heat strain than the four-pack vest. PeakTe andTsk at the end of heat exposure for 6-pack vest [mean (SD) 38.0(0.3)°C and 36.8(0.7)°C] were significantly lower compared to four-pack [38.6 (0.4)°C and 38.1(0.5)°C] and controls [38.9(0.5)°C and 38.4(0.5)°C]. Our findings suggest that the six-pack vest is more effective than the four-pack vest at reducing heat strain and improves performance of personnel wearing a firefighting ensemble.