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首页> 美国卫生研究院文献>Cerebral Cortex (New York NY) >Different Effects of Sleep Deprivation and Torpor on EEG Slow-Wave Characteristics in Djungarian Hamsters
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Different Effects of Sleep Deprivation and Torpor on EEG Slow-Wave Characteristics in Djungarian Hamsters

机译：睡眠剥夺和睡眠时间对匈牙利仓鼠脑波慢波特征的不同影响

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It has been shown previously in Djungarian hamsters that the initial electroencephalography (EEG) slow-wave activity (power in the 0.5–4.0 Hz band; SWA) in non-rapid eye movement (NREM) sleep following an episode of daily torpor is consistently enhanced, similar to the SWA increase after sleep deprivation (SD). However, it is unknown whether the network mechanisms underlying the SWA increase after torpor and SD are similar. EEG slow waves recorded in the neocortex during sleep reflect synchronized transitions between periods of activity and silence among large neuronal populations. We therefore set out to investigate characteristics of individual cortical EEG slow waves recorded during NREM sleep after 4 h SD and during sleep after emergence from an episode of daily torpor in adult male Djungarian hamsters. We found that during the first hour after both SD and torpor, the SWA increase was associated with an increase in slow-wave incidence and amplitude. However, the slopes of single slow waves during NREM sleep were steeper in the first hour after SD but not after torpor, and, in contrast to sleep after SD, the magnitude of change in slopes after torpor was unrelated to the changes in SWA. Furthermore, slow-wave slopes decreased progressively within the first 2 h after SD, while a progressive increase in slow-wave slopes was apparent during the first 2 h after torpor. The data suggest that prolonged waking and torpor have different effects on cortical network activity underlying slow-wave characteristics, while resulting in a similar homeostatic sleep response of SWA. We suggest that sleep plays an important role in network homeostasis after both waking and torpor, consistent with a recovery function for both states.
机译：先前在Djungarian仓鼠中已显示出，每天发作一次后，非快速眼动（NREM）睡眠中的初始脑电图（EEG）慢波活动（0.5-4.0 Hz范围内的功率； SWA）一直得到增强，类似于睡眠剥夺（SD）后SWA的增加。但是，尚不清楚在Torpor和SD之后，SWA底层的网络机制是否类似。睡眠期间新皮层中记录的EEG慢波反映出活动周期和大量神经元群体沉默之间的同步过渡。因此，我们着手调查成年雄性Djungarian仓鼠每日N次发作后在NREM睡眠后4h SD期间以及睡眠后睡眠期间记录的单个皮质EEG慢波的特征。我们发现，在SD和Torpor之后的第一个小时内，SWA的增加与慢波入射和振幅的增加有关。然而，在NREM睡眠期间，单慢波的斜率在SD后的第一小时内陡峭，但在躯干后则不陡，并且与SD后的睡眠相反，躯干后的斜率变化幅度与SWA的变化无关。此外，慢波斜率在SD后的前2 h内逐渐减小，而慢波斜率在torpor后的前2 h内逐渐增大。数据表明，长时间的清醒和to绕对慢波特征下的皮层网络活动具有不同的影响，同时导致类似的SWA稳态睡眠反应。我们建议，睡眠在醒来和打气后在网络动态平衡中起着重要作用，这与两种状态的恢复功能一致。

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