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相关概念视频

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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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相关实验视频

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Non-invasive Assessment of Changes in Corticomotoneuronal Transmission in Humans
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中等强度运动引起的乳酸变化不能预测皮质脊髓刺激能力的变化.

Cassidy Klein1,2, Jess T Gibson1,3, Hayley N Pettigrew1,4

  • 1Laboratory for Brain Recovery and Function, Dalhousie University, Halifax, NS B3H 4R1, Canada.

Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme
|September 24, 2025
PubMed
概括

适度的有氧运动可以增强皮质脊髓刺激能力 (CSE),但这项研究发现乳酸积累并不能推动这种效应. 乳酸水平没有预测运动后CSE的变化,这表明其他机制在发挥作用.

关键词:
有氧运动是有氧运动.皮质脊柱刺激能力乳酸乳酸是一种乳酸.神经生理学神经生理学跨的磁性刺激

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科学领域:

  • 运动生理学 运动生理学
  • 神经科学是一个神经科学.
  • 发动机控制器的控制器

背景情况:

  • 众所周知,有氧运动会增加皮质脊髓刺激能力 (CSE),可能有助于运动学习.
  • 运动期间的乳酸积累被假设为CSE变化的关键调解者.
  • 之前的研究主要研究了乳酸在最大或疲劳性运动中的作用,在稳定状态中中等强度运动中没有研究其作用.

研究的目的:

  • 为了研究血液中乳酸度和中等强度运动期间运动诱导的CSE变化之间的关系.
  • 为了确定乳酸积累是否是驱动稳定状态有氧运动后增强CSE的主要机制.

主要方法:

  • 24名健康的参与者完成了两次训练:一次最大级运动测试和一次20分钟的中等强度自行车运动 (60%的峰值功率输出).
  • 第一个背部内骨肌的皮层脊髓刺激能力 (CSE) 通过运动前,运动后立即和运动后10分钟的跨磁刺激 (TMS) 进行测量.
  • 血液中的乳酸盐水平与CSE评估相同的时间点进行测量.

主要成果:

  • 线性回归分析显示,血中乳酸盐度与运动引起的CSE变化之间没有显著的关联.
  • 乳酸水平没有预测运动后立即发生的CSE变化 (R2 = 0.02184,p = 0.4907).
  • 乳酸水平也没有预测运动后10分钟的CSE变化 (R2 = 0.02121,p = 0.4971).

结论:

  • 血中乳酸度似乎不是导致中等强度有氧运动后观察到的CSE增加的主要机制.
  • 这些发现表明,其他生理因素在稳定状态中促进皮质脊髓刺激能力的增强,适度的运动.