Morrison J B, Conn M L, Hayward J S
J Appl Physiol Respir Environ Exerc Physiol. 1979 Jun;46(6):1061-5. doi: 10.1152/jappl.1979.46.6.1061.
To quantify the core temperature gain derived from inhalation rewarming, 10 subjects were immersed in seawater (mean temperature 12 degrees C) until a 2 degree C drop in rectal temperature occurred, and were then rewarmed by breathing hot saturated air at 45 degrees C for 30 min. Each subject was rewarmed once breathing air and once rebreathing a controlled fraction of expired air adjusted to produce a hyperventilation of 50 l/min. After 30 min of rewarming mean rectal temperature had increased 0.39 degrees C in subjects breathing air compared with 0.77 degrees C in those hyperventilating (P less than 0.01). Corresponding gains in tympanic temperatures were 1.1 and 1.5 degrees C, respectively. Calculations indicate that the additional heat input with hyperventilation yielded a core (rectal) temperature gain of 5.1 X 10(-4) degrees C/l. It is concluded that each additional 10 l/min of ventilation of hot saturated air will increase the rate of core rewarming from hypothermia by approximately 0.3 degrees C/h.
为了量化吸入复温所带来的核心体温升高，10名受试者被浸入海水中（平均温度12摄氏度），直到直肠温度下降2摄氏度，然后通过呼吸45摄氏度的热饱和空气30分钟进行复温。每名受试者一次呼吸空气进行复温，一次重新呼吸经控制的呼出气体部分，调整呼出气体以产生50升/分钟的过度通气。复温30分钟后，呼吸空气的受试者直肠平均温度升高了0.39摄氏度，而过度通气的受试者直肠平均温度升高了0.77摄氏度（P<0.01）。相应的鼓膜温度升高分别为1.1摄氏度和1.5摄氏度。计算表明，过度通气带来的额外热量输入使核心（直肠）温度升高了5.1×10⁻⁴摄氏度/升。得出的结论是，每额外增加10升/分钟的热饱和空气通气量，将使体温过低时的核心复温速率提高约0.3摄氏度/小时。
