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Local Anesthetics: Differential Sensitivity of Nerve Fibers01:24

Local Anesthetics: Differential Sensitivity of Nerve Fibers

Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...

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脊椎肌硬度的差异:使用肌测量的观察性研究.

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骨 (PT) 硬度在整个长度上有所不同,在近距离和远距离上比中间更高. 使用肌测量测量肌硬度测量在所有测试的PT位置都具有高度可靠性.

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科学领域:

  • 生物力学 生物力学
  • 运动医学 运动医学
  • 肌肉骨研究 研究

背景情况:

  • 状肌病症涉及近侧状肌 (PT) 的疼痛.
  • 了解PT刚度变化和测量可靠性对于损伤评估至关重要.
  • 关于局部PT刚度和测量一致性的数据有限.

研究的目的:

  • 为了研究不同位置的PT刚度的差异.
  • 评估在这些位置测量PT刚性的可靠性.
  • 为了比较男性和女性休运动员之间的PT度.

主要方法:

  • 使用肌测量来测量PT度.
  • 在九个位置进行测量 (近端,水平-中线,远端;中间,垂直-中线,侧面) 在90度的膝盖曲.
  • 在48名休运动员 (24名男性,24名女性) 的主导腿上进行了三次测量.

主要成果:

  • 与水平中线相比,PT硬度在近位和远位区域显著更高.
  • 与垂直中线相比,中间和侧面区域的硬度较低.
  • 类内相关系数超过0.9,变化系数低于3%,这表明所有地点的可靠性都很好.

结论:

  • 肌硬度表现出明显的区域差异.
  • 肌测量为评估局部PT度提供了一种可靠的方法.
  • 这些发现可以为状肌病的诊断和治疗策略提供信息.