Bain B, Vallerand A L
Biosciences Division, DCIEM, North York, Ont., Canada.
Aviat Space Environ Med. 1992 Apr;63(4):267-72.
The effect of auxiliary air cooling on endurance time and limb blood flow in the heat (37 degrees C, 50% r.h., target time = 150 min) while wearing aircrew chemical defense (CD) ensembles was examined. Eight males were dressed in aircrew CD ensembles with or without an air-cooled vest. After an initial 10 min treadmill walk and 20 min of seated rest, the subjects alternately rested and exercised on a cycle ergometer (10 min rest, 10 min exercise) resulting in an overall metabolic rate of 240 W. Arm and leg blood flow (ABF, LBF), determined by venous occlusion plethysmography, were significantly lower with air cooling (AC) than with no cooling (NC) during the same time period (p less than 0.05). Endurance time was much greater with AC than with NC (150 min AC vs. 92 +/- 0.08 min NC, p less than 0.01). Arm and calf skin temperatures, rectal temperature and heart rate were all significantly lower with AC than with NC (p less than 0.05) after the onset of the cycle exercise. The results show that the use of the air-cooled vest under these conditions was able to increase heat tolerance and reduce blood flow to the periphery.
研究了在穿着空勤人员化学防护服的情况下，辅助空气冷却对高温环境（37摄氏度，相对湿度50%，目标时长 = 150分钟）下耐力时间和肢体血流的影响。八名男性穿着带有或不带有风冷背心的空勤人员化学防护服。在最初10分钟的跑步机行走和20分钟的坐姿休息后，受试者在自行车测力计上交替休息和运动（10分钟休息，10分钟运动），总体代谢率为240瓦。在同一时间段内，通过静脉阻塞体积描记法测定的手臂和腿部血流（ABF、LBF），风冷（AC）组显著低于无冷却（NC）组（p < 0.05）。风冷组的耐力时间比无冷却组长得多（AC组为150分钟，NC组为92 ± 0.08分钟，p < 0.01）。在自行车运动开始后，风冷组的手臂和小腿皮肤温度、直肠温度和心率均显著低于无冷却组（p < 0.05）。结果表明，在这些条件下使用风冷背心能够提高耐热性并减少外周血流。
