通过强制分割人类的睡眠-清醒周期来检测到两个振荡元件
Satoko Hashimoto1, Takuro Endo1, Sato Honma1
1Department of Physiology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
概括
人类的睡眠可以分为两个不同的情节,即使在恒定的条件下也会持续下去. 暴露在明亮光线下会对黑激素和体温节律产生不同的影响,这表明双振荡器调节昼夜过程.
科学领域:
- 时间生物学 时间生物学
- 睡眠科学 睡眠科学
- 人体生理学 人体生理学
背景情况:
- 人类的睡眠-觉醒周期通常是巩固的,但可以受到环境光线线索的影响.
- 了解睡眠调节的基本昼夜机制对于解决睡眠障碍至关重要.
研究的目的:
- 为了研究在自由运行条件下人工分裂睡眠情节的持续性.
- 为了检查不同强度的光对黑色素和体温的昼夜节律的影响.
- 探索双昼夜振荡器在调节人类睡眠和昼夜节律方面的潜在参与.
主要方法:
- 人类受试者每天两次进行8小时的光/4小时的黑暗周期,持续7天,随后进行3天的自由运行期.
- 睡眠仅限于黑暗阶段.
- 试验对象在照明阶段暴露于普通 (500 lx) 或明亮 (5,000 lx) 的光线,并遵循特定的光线暴露时间和强度协议.
主要成果:
- 在自由跑步期间,分裂睡眠情节持续存在,观察到主要和轻微的睡眠情节.
- 循环黑激素节律在普通光组中显示出显著的相延迟,在明亮光组中显示出相进展.
- 亮光组表现出夜间黑激素分泌 (NMS) 持续时间缩短,与上升阶段相比,下降阶段的进展更大,这种差异在普通光组中没有见到. 身体温度节奏表现出类似的模式.
结论:
- 分裂睡眠情节似乎是由不同于主要的昼夜节律起器的振荡机制调节的.
- 在NMS上升和下降阶段的光敏感度差异表明了单独的昼夜振荡器的参与.
- 这些发现支持昼夜节律起器的双振荡器模型和起器与睡眠-清醒周期之间的相互作用的等级模型.
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