Heat stress can be a significant problem in high-performance aircraft, where it has a measurable ohvsiolouicul impact on aircrcw and may alter the learning curve for novel tasks. In these experiments nine 1111:11 wen: uamed 1O plateau performance on a compensatory tracking task. They were then tested at the end of 2 h exposures to the following conditions (Tdbl T w b , "C): Control (C) 25/ambienl. Warm (W) 35/26 and HOI (H) 40/30. For Wand H, globe temperature was raised to 12°C above T db by infrared lamps. While W was physiologically compensable. H was near the upper limit of tolerance. as shown by steadily rising heart rate. elevated rectal temperature and IA kg mean weight loss. The simplest tracking task showed a small but statistically significant improvement in time on target with heat, while two more difficult tasks showed no change. Human operator modelling supported these findings. Discussion relates these results to actual cockpit conditions and the literature of performance in heal.
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