相关实验视频
Updated: Aug 10, 2026
08:45
Polygraphic Recording Procedure for Measuring Sleep in Mice
Published on: January 25, 2016
概括
袋鼠大鼠在睡眠期间表现出改变的代谢热量产生. 在悖论性睡眠期间,他们的温度调节系统看起来不起作用,影响身体温度调节.
科学领域:
- 生理学 生理学 生理学
- 神经科学是一个神经科学.
- 睡眠研究 睡眠研究
背景情况:
- 哺乳动物的温度调节是复杂的,涉及复杂的生理反应,以保持稳定的体温.
- 众所周知,睡眠状态会影响新陈代谢率和体温,但潜在的机制仍然不完全理解.
- 下丘脑在调节温度和睡眠方面起着至关重要的作用.
研究的目的:
- 为了研究在袋鼠大鼠不同睡眠阶段下丘脑温度和代谢热量产生之间的关系.
- 在清醒,慢波睡眠和矛盾睡眠期间确定温度调节系统的运行状态.
- 阐明哺乳动物在睡眠期间改变温度调节的生理基础.
主要方法:
- 利用长期植入的,透过水的热模来操纵不受约束的袋鼠大脑下垂体温度.
- 连续记录皮质脑电图 (EEG),脑电图 (EMG),新陈代谢率和身体运动.
- 将代谢热量产生的反应与在清醒状态和两个不同的睡眠阶段对下丘脑温度的受控变化进行比较.
主要成果:
- 在慢波睡眠期间,与清醒相比,启动代谢热量产生的门下丘脑温度降低了.
- 与下丘脑温度相关的代谢热量产生比例常数也在慢波睡眠期间降低.
- 在悖论性睡眠期间,降低下丘脑温度未能引起新陈代谢热量产生增加,这表明温度调节系统不起作用.
结论:
- 对下丘脑温度变化的热调节反应在睡眠状态之间有显著差异.
- 在袋鼠的悖论性睡眠期间,温度调节系统似乎在很大程度上失效.
- 这些发现为哺乳动物在睡眠期间观察到的体温和新陈代谢率变化提供了生理解释.
相关概念视频
01:25Body Temperature
The body's temperature, measured in degrees, is determined by the balance between heat production and dissipation to the surrounding environment. For instance, if exercising vigorously, the body will produce more heat, causing sweat and dissipating that heat. Despite extreme environmental conditions and physical exertion, the human temperature-control system maintains a constant core body temperature (the temperature of deep tissues, which are the tissues located beneath the skin and other...
01:24Sleep-Wake Cycles
Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
01:07Body Temperature
Body temperature reflects the equilibrium between heat production and heat loss within the body. Most heat is generated by metabolically active tissues, particularly the liver, heart, brain, kidneys, and endocrine organs. At rest, skeletal muscles contribute 20–30% of total heat production, but during vigorous exercise, this can increase up to 30–40 times.
The average body temperature is approximately 37°C (98.6°F) and typically ranges from 36.1–37.2°C (97–99°F), remaining relatively stable...
The average body temperature is approximately 37°C (98.6°F) and typically ranges from 36.1–37.2°C (97–99°F), remaining relatively stable...
01:26Thermoregulation
The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
01:22Physiology of Respiration II: Neurogenic Control of Respiration
The neurogenic control of respiration coordinates various neural networks and pathways to regulate breathing rate and depth, meeting the body's oxygen and carbon dioxide exchange requirements. This system adapts to physiological and environmental conditions, ensuring optimal breathing patterns.
Central Control
The brainstem is the primary site of central control, hosting respiratory centers:
Central Control
The brainstem is the primary site of central control, hosting respiratory centers:
01:11Understanding Sleep
Sleep, an essential biological state, involves significant reductions in physical activity, sensory awareness, and interaction with the environment. This complex physiological process is primarily regulated by specific brain regions, notably the hypothalamus and pons, which govern the sleep-wake cycle or circadian rhythm.
The circadian rhythm, a nearly 24-hour cycle, is deeply influenced by environmental light cues. Light exposure directly affects the hypothalamus, which in turn regulates...
The circadian rhythm, a nearly 24-hour cycle, is deeply influenced by environmental light cues. Light exposure directly affects the hypothalamus, which in turn regulates...