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Improved feasibility of astronaut short-radius artificial gravity through a 50-day incremental, personalized, vestibular acclimation protocol.
npj Microgravity ( IF 4.4 ) Pub Date : 2020-08-26 , DOI: 10.1038/s41526-020-00112-w
Kathrine N Bretl 1 , Torin K Clark 1
Affiliation  

The “Coriolis” cross-coupled (CC) illusion has historically limited the tolerability of utilizing fast-spin rate, short-radius centrifugation for in-flight artificial gravity. Previous research confirms that humans acclimate to the CC illusion over 10 daily sessions, though the efficacy of additional training is unknown. We investigated human acclimation to the CC illusion over up to 50 daily sessions of personalized, incremental training. During each 25-min session, subjects spun in yaw and performed roll head tilts approximately every 30 s, reporting the presence or absence of the illusion while rating motion sickness every 5 min. Illusion intensity was modulated by altering spin rate based upon subject response, such that the administered stimulus remained near each individual’s instantaneous illusion threshold. Every subject (n = 11) continued to acclimate linearly to the CC illusion during the investigation. Subjects acclimated at an average rate of 1.17 RPM per session (95% CI: 0.63–1.71 RPM per session), with the average tolerable spin rate increasing from 1.4 to 26.2 RPM, corresponding to a reduction in required centrifuge radius from 456.6 to 1.3 m (to produce loading of 1 g at the feet). Subjects reported no more than slight motion sickness throughout their training (mean: 0.92/20, 95% CI: 0.35–1.49/20). We applied survival analysis to determine the probability of individuals reaching various spin rates over a number of training days, providing a tolerability trade parameter for centrifuge design. Results indicate that acclimation to a given, operationally relevant spin rate may be feasible for all subjects if given a sufficient training duration.



中文翻译:

通过 50 天的增量、个性化、前庭适应协议提高了宇航员短半径人工重力的可行性。

“科里奥利”交叉耦合 (CC) 错觉历来限制了利用快速旋转速度、短半径离心进行飞行中人工重力的耐受性。先前的研究证实,人类每天会在 10 次以上的训练中适应 CC 错觉,但额外训练的效果尚不清楚。我们通过每天多达 50 次的个性化增量训练,调查了人类对 CC 错觉的适应情况。在每 25 分钟的会议期间,受试者大约每 30 秒旋转一次偏航并进行一次侧倾头,报告幻觉的存在或不存在,同时每 5 分钟评估一次晕动病。通过根据受试者反应改变旋转速率来调节幻觉强度,使得所给予的刺激保持在每个人的瞬时幻觉阈值附近。每个主题(n = 11) 在调查期间继续线性适应 CC 错觉。受试者以每节 1.17 RPM 的平均速率适应(95% CI:每节 0.63-1.71 RPM),平均可耐受旋转速率从 1.4 增加到 26.2 RPM,对应于所需的离心机半径从 456.6 减少到 1.3 m (在脚部产生 1 g 的负载)。受试者在整个训练过程中报告的只是轻微的晕动病(平均值:0.92/20,95% CI:0.35–1.49/20)。我们应用生存分析来确定个体在多个训练日内达到不同转速的概率,为离心机设计提供了一个耐受性交易参数。结果表明,如果给予足够的训练时间,所有受试者都可以适应给定的、操作相关的旋转速率。

更新日期:2020-08-26
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