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Weightlessness01:01

Weightlessness

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When an object is dropped, it accelerates toward the center of the Earth. If the net external force on the object is its weight, it is said to be in free fall; that is, the only force acting on the object is gravity. Galileo was instrumental in showing that, in the absence of air resistance, all objects fall with the same acceleration g. However, when objects on the Earth fall downward, they are never truly in free fall, because there is always some upward resistance force from the air acting...
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Coherence between Brain Cortical Function and Neurocognitive Performance during Changed Gravity Conditions
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超重力对人类感觉运动系统来说比微重力更具挑战性.

Loïc Chomienne1, Patrick Sainton2, Fabrice R Sarlegna2

  • 1Aix Marseille Univ, CNRS, ISM, Marseille, France. l.chomienne@gmail.com.

NPJ microgravity
|January 10, 2025
PubMed
概括

人类的运动控制以不同的方式适应重力变化. 微重力允许准确的达到,而超重力导致下射,这是由于传感运动系统适应的挑战.

科学领域:

  • 神经科学是一个神经科学.
  • 人类运动控制人体运动控制
  • 引力生理学 重力生理学

背景情况:

  • 中枢神经系统调整运动控制以适应不同的重力的能力,对于复杂的运动至关重要.
  • 了解大脑如何适应微重力和超重力对于太空旅行和地面应用至关重要.

研究的目的:

  • 研究微重力和超重力对达到运动的神经肌肉控制的不同影响.
  • 测试不同的重力水平在传感运动规划和控制中引起独特反应的假设.

主要方法:

  • 参与者 (n=9) 在抛物线飞行期间向视觉目标进行了伸展运动.
  • 记录了全身动力学和肌肉活动,以分析运动调整.
  • 在微重力,正常重力和超重力条件下,达到精度和肌肉激活模式的比较.

主要成果:

  • 在微重力中,参与者调整了全身动力学和肌肉活动,达到与正常重力相当的精度.
  • 在超重力中,观察到目标的持续下射,这表明肌肉激活的重组不足.
  • 在研究的时间范围内,人类的感觉运动系统表现出难以适应超重力挑战的困难.

结论:

  • 微重力促进了达到运动的适应,通过神经肌肉调整保持精度.

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  • 超重力对传感运动系统构成重大挑战,导致由于适应不充分而导致达到性能受损.
  • 需要进一步的研究来探索超重力对运动控制和四肢动力学内部模型的长期影响和潜在机制.