Ryan A T, Hale B, Megirian D, Sherrey J H
Physiol Behav. 1983 Feb;30(2):237-42. doi: 10.1016/0031-9384(83)90012-4.
Four male potoroos (Potorous tridactylus apicalis) breathed 21% and 7% O2 with and without the addition of 5% CO2. The effects of these gas mixtures on the potoroo's sleeping-waking pattern (SWP) were studied. The SWP while breathing 21% O2/5% CO2 was unchanged when compared with that of breathing ambient air (21% O2). While breathing 7% O2, the SWP was severely disrupted: total sleep time (TST) and slow wave sleep (SWS) increased markedly. Brain temperature fell substantially. Paradoxical sleep (PS) was almost abolished and wakefulness (W) decreased. The addition of 5% CO2 to the O2 deficient gas mixture, i.e., 7% O2/5% CO2, restored the SWP to that obtained while breathing ambient air. It is concluded that CO2 neutralizes the disruptive effect which hypoxia has on the potoroo's SWP. It is hypothesized that this constitutes a homeostatic mechanism for stabilizing the SWP and is carried over from pouch life.
四只雄性长鼻袋狸（Potorous tridactylus apicalis）在添加和不添加5%二氧化碳的情况下分别呼吸21%和7%的氧气。研究了这些气体混合物对长鼻袋狸睡眠-觉醒模式（SWP）的影响。与呼吸环境空气（21%氧气）相比，呼吸21%氧气/5%二氧化碳时的SWP没有变化。在呼吸7%氧气时，SWP受到严重干扰：总睡眠时间（TST）和慢波睡眠（SWS）显著增加。脑温大幅下降。异相睡眠（PS）几乎消失，觉醒（W）减少。向缺氧气体混合物（即7%氧气/5%二氧化碳）中添加5%二氧化碳后，SWP恢复到呼吸环境空气时的状态。结论是，二氧化碳中和了缺氧对长鼻袋狸SWP的干扰作用。据推测，这构成了一种稳定SWP的稳态机制，并且是从育儿袋生活延续而来的。
