McLellan T M, Jacobs I, Bain J B
Defence and Civil Institute of Environmental Medicine, North York, Ontario, Canada.
Aviat Space Environ Med. 1993 Jul;64(7):595-8.
This study examined the benefits of work and rest schedules on soldiers' work tolerance (WTT) while wearing various levels of nuclear, biological and chemical (NBC) defence protective clothing in a warm environment (30 degrees C and 50% R.H.). Eight unacclimatized males were assigned to exercise at either a light (walking 1.11 m.s-1 0% grade, alternating with lifting 10 kg) or heavy metabolic rate (walking 1.33 m.s-1 7.5% grade, alternating with lifting 20 kg). Subjects were tested wearing three levels of clothing protection: combat clothing (L); combats and a semi-permeable NBC overgarment with the hood down (M); combats and NBC overgarment, gloves, boots and respirator (H). For each clothing configuration, subjects were evaluated using both a "continuous" exercise protocol and an intermittent work and rest schedule. WTT was defined as the time until rectal temperature (Tre) reached 39.3 degrees C, heart rate reached 95% maximum, dizziness or nausea precluded further exercise, or 5 h had elapsed. Assuming a resting VO2 of 4 ml.kg-1 x min-1 an average metabolic rate was calculated for all trials. A decreasing hyperbolic function described the relationship between WTT and metabolic rate for M and H. These relationships facilitate quantification of appropriate work and rest schedules if the metabolic rate of a task is known.
本研究探讨了在温暖环境（30摄氏度，相对湿度50%）中，士兵穿着不同防护等级的核生化（NBC）防护服时，工作休息时间表对其工作耐力（WTT）的影响。八名未经适应训练的男性被分配进行轻度（以1.11米/秒的速度在0%坡度上行走，交替进行10千克的举重）或重度代谢率（以1.33米/秒的速度在7.5%坡度上行走，交替进行20千克的举重）的运动。受试者穿着三种防护等级的服装进行测试：作战服（L）；作战服和半透性NBC外罩且头罩放下（M）；作战服、NBC外罩、手套、靴子和呼吸器（H）。对于每种服装配置，受试者使用“连续”运动方案和间歇性工作休息时间表进行评估。WTT定义为直肠温度（Tre）达到39.3摄氏度、心率达到最大心率的95%、头晕或恶心导致无法继续运动或经过5小时的时间。假设静息耗氧量为4毫升·千克-1·分钟-1，计算所有试验的平均代谢率。一个递减的双曲线函数描述了M和H的WTT与代谢率之间的关系。如果已知任务的代谢率，这些关系有助于量化适当的工作休息时间表。
