Pimental N A, Cosimini H M, Sawka M N, Wenger C B
Aviat Space Environ Med. 1987 Feb;58(2):119-24.
We evaluated the effectiveness of an air-cooled vest in reducing thermal strain of subjects exercising in the heat (49 degrees C dry bulb (db), 20 degrees C dew point (dp] in chemical protective clothing. Four male subjects attempted 300-min heat exposures at two metabolic rates (175 and 315 W) with six cooling combinations--control (no vest) and five different db and dp combinations. Air supplied to the vest at 15 scfm ranged from 20-27 degrees C db, 7-18 degrees C dp; theoretical cooling capacities were 498-687 W. Without the vest, endurance times were 118 min (175 W) and 73 min (315 W). Endurance times with the vest were 300 min (175 W) and 242-300 min (315 W). The five cooling combinations were similarly effective in reducing thermal strain and extending endurance time, although there was a trend for the vest to be more effective when supplied with air at the lower dry bulb temperature. At 175 W, subjects maintained a constant body temperature; at 315 W, the vest's ability to extend endurance is limited to about 5 hours.
我们评估了风冷背心在减轻处于高温环境（干球温度49摄氏度，露点温度20摄氏度）且身着化学防护服进行锻炼的受试者热应激方面的有效性。四名男性受试者在两种代谢率（175瓦和315瓦）下尝试进行300分钟的热暴露，共有六种冷却组合——对照组（不穿背心）以及五种不同的干球温度和露点温度组合。以15立方英尺每分钟的流量供应给背心的空气，其干球温度范围为20 - 27摄氏度，露点温度范围为7 - 18摄氏度；理论冷却能力为498 - 687瓦。不穿背心时，耐力时间分别为118分钟（175瓦）和73分钟（315瓦）。穿着背心时，耐力时间分别为300分钟（175瓦）和242 - 300分钟（315瓦）。尽管当供应较低干球温度的空气时，背心似乎更有效，但五种冷却组合在减轻热应激和延长耐力时间方面同样有效。在175瓦时，受试者能维持恒定体温；在315瓦时，背心延长耐力的能力限制在约5小时。
