肩膀肌肉的皮质脊柱激发能力的变化,跨越功能性膜关节位置
Garrick N Forman1, Kailynn Mannella2,3, Robin MacKenzie1
1Department of Kinesiology, Brock University, St. Catharines, Ontario, Canada.
Journal of neurophysiology
|July 28, 2025
概括
肩关节的角度显著影响神经驱动器到周围的肌肉. 九十度的绑架最大限度地提高了肌肉刺激能力,而中立的位置将其降低到最低,为伤害预防策略提供了信息.
科学领域:
- 神经科学是一个神经科学.
- 生物力学 生物力学
- 运动学 运动学
背景情况:
- 肩膀的复杂解剖学和广泛的运动范围使其易受伤害,通常与尬的姿势有关.
- 了解手臂方向如何影响神经驱动到肩膀肌肉对于破译肌肉招募和损伤机制至关重要.
研究的目的:
- 为了研究不同腺关节角度对围绕肩部复合体的肌肉皮质脊髓刺激性的影响.
- 为了确定关节位置如何影响神经驱动,关键的肩膀肌肉在休息状态下.
主要方法:
- 十名参与者使用跨磁刺激 (TMS) 进行了测试,在五个随机的腺关节角度 (中性,45°和90°曲/绑架) 进行了测试.
- 表面电肌图 (sEMG) 记录了八个主要手臂肌肉的神经活动,包括deltoids,supraspinatus和trapezius.
- 运动唤起潜能 (MEP) 在不同激发强度中测量,以评估皮质脊髓刺激能力.
主要成果:
- 观察到关节角度和刺激强度之间有显著的相互作用,90°的肩部绑架产生了最高的MEP幅度.
- 中立的肩部位置在所有测试强度中产生了最低的MEP幅度.
- 与状肌肉相比,上肌肉在不同关节角度的兴奋性表现出更大的变化.
结论:
- 显而易见地,门关节角度改变了肩膀肌肉中的休息皮质脊髓刺激能力.
- 特定的关节位置,特别是90度绑架,增强肌肉刺激能力,而中性位置减少它.
- 这些发现对优化任务设计和为肩部相关活动制定有针对性的伤害预防策略具有重要意义.
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