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首页> 美国卫生研究院文献>Scientific Reports >Circadian challenge of astronauts’ unconscious mind adapting to microgravity in space estimated by heart rate variability
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Circadian challenge of astronauts’ unconscious mind adapting to microgravity in space estimated by heart rate variability

机译：通过心率变异性估算宇航员无意识的大脑适应空间微重力的昼夜节律挑战

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It is critical that the regulatory system functions well in space’s microgravity. However, the “intrinsic” cardiovascular regulatory system (β), estimated by the fractal scaling of heart rate variability (HRV) (0.0001–0.01 Hz), does not adapt to the space environment during long-duration (6-month) space flights. Neuroimaging studies suggest that the default mode network (DMN) serves a broad adaptive purpose, its topology changing over time in association with different brain states of adaptive behavior. Hypothesizing that HRV varies in concert with changes in brain’s functional connectivity, we analyzed 24-hour HRV records from 8 healthy astronauts (51.8 ± 3.7 years; 6 men) on long (174.5 ± 13.8 days) space missions, obtained before launch, after about 21 (ISS01), 73 (ISS02), and 156 (ISS03) days in space, and after return to Earth. Spectral power in 8 frequency regions reflecting activity in different brain regions was computed by maximal entropy. Improved β (p < 0.05) found in 4 astronauts with a positive activation in the “HRV slow-frequency oscillation” (0.10–0.20 Hz) occurred even in the absence of consciousness. The adaptive response was stronger in the evening and early sleep compared to morning (p = 0.039). Brain functional networks, the DMN in particular, can help adapt to microgravity in space with help from the circadian clock.
机译：至关重要的是，监管系统必须在太空的微重力中发挥良好的作用。但是，通过心率变异性（HRV）（0.0001-0.01 Hz）的分形标度估算的“内在”心血管调节系统（β）在长时间（6个月）的太空飞行中不适应太空环境。神经影像学研究表明，默认模式网络（DMN）具有广泛的适应性目的，其拓扑随着时间的变化与适应性行为的不同大脑状态相关联。假设HRV随大脑功能连接的变化而变化，我们分析了8名健康宇航员（51.8±3.7岁； 6名男性）在发射前，发射后约174.5±13.8天执行的24小时HRV记录返回太空后21（ISS01），73（ISS02）和156（ISS03）天。通过最大熵来计算反映不同大脑区域活动的8个频率区域的频谱功率。即使在没有意识的情况下，在“ HRV慢频率振荡”（0.10–0.20 Hz）中具有积极激活的4位宇航员中，β的改善（p <0.05）也出现了。与早晨相比，晚上和早睡的适应性反应更强（p = 0.039）。在昼夜节律的帮助下，大脑功能网络（尤其是DMN）可以帮助适应太空中的微重力。

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