热环境中吸入两种温度空气对家兔气管、食道和直肠温度的影响

EFFECT OF INSPIRED AIR OF TWO DIFFERENTTEMPERATURES ON TRACHEAL,ESOPHAGEAL AND RECTAL TEMPERATURES IN RABBITS IN HOT ENVIRONMENT

本文报告了家兔在热环境中吸入两种温度空气时产生的散热效应。结果表明，清醒家兔在温度４０℃环境中持续暴露时，气管温度（Ｔｔ）、食道温度（Ｔｅ）和直肠温度（Ｔｒ）持续上升。自Ｔｒ达４２℃至死亡，平均历时７５．３３±３．１５ｍｉｎ，在Ｔｒ达４２℃后吸入２０℃空气，Ｔｔ显著降低，Ｔｅ不升高，Ｔｒ上升速度减缓，比吸入４０℃空气对照组的存活时间平均延长约８７ｍｉｎ。吸入５℃冷空气，Ｔｅ和Ｔｔ显著降低的同时，阻止了Ｔｒ的上升，动物不死亡。提示，在热环境中吸入冷空气能显著增强呼吸的散热效应，预防或延缓热射病的发生有一定作用。

he heat dissipation effect of inspired air of two different temperaturesin rabbits in hot environment was reported in this paper.The resuIts show -ed as follows:The tracheal (Tt),esophageal(Te)and rectal(Tr)tempera-tures were continuously elevated when rabbits were kept in 40℃ environ-ment.The average time interval for the death of rabbit from Tr 42℃ was75.33 ± 3.15min . In rabbits which began to inspire 20℃ air as the Tr roseto 42℃, the Tt decreased markedly,the Te stopped to rise and Tr rose slow-ly,The average survival time of rabbits inspiring 20℃ air was prolonged,nad was 87min longer than that of those inspiring 40℃ air. In rabbitswhich inspired 5℃air when the Tr rose to 42℃,the Tt and Te decreased andTrshowed no rise.There was no death of animals.The results suggestthat in hot environment,inspiration of cool air can markedly enhance re-spiratory heat dissipation,therefore,can be used as a measure to preventor postpone heat stroke.