评估外围神经肌肉功能与短暂的运动引起的疼痛.
Emmanuel Ogalo1,2, Lukas D Linde1, Hannah Ro1
1International Collaboration on Repair Discoveries (ICORD), Vancouver, British Columbia, Canada.
Journal of neurophysiology
|February 14, 2024
概括
在健康的成年人中,运动引起的疼痛减少了峰值力量和力量发展的速度,尽管肌肉活动没有变化. 这表明神经肌肉策略发生了变化,而不是在痛苦的运动中减少肌肉激活.
科学领域:
- 神经肌肉生理学 神经肌肉生理学
- 疼痛科学 疼痛科学
- 肌肉骨健康 肌肉骨健康
背景情况:
- 运动引起的疼痛是肌肉骨疾病中常见但未被充分研究的残疾原因.
- 了解神经肌肉对运动疼痛的反应对于开发有效干预措施至关重要.
研究的目的:
- 为了研究运动引起的疼痛对力量产生的影响,电肌图 (EMG) 活动,以及在次最大收缩期间力量发展的速度 (RFD).
- 探索潜在的神经肌肉适应,在疼痛过程中减少力量的基础.
主要方法:
- 健康的成年人在基线 (无疼痛) 和实验诱导的运动引起的疼痛条件下进行了同度第一指绑架收缩.
- 激光刺激用于诱导手背部的疼痛.
- 在亚最大收缩期间测量了力,EMG和RFD.
主要成果:
- 与基线相比,运动引起的疼痛显著降低了正常化力 (11%) 和RFD (15%).
- 在正常化峰值EMG活动中没有观察到显著变化.
- 运动开始后50-200毫秒内RFD和EMG的早期测量没有受到影响.
结论:
- 运动引起的疼痛会损害峰值力和RFD,但不会损害早期收缩特性或整体肌肉激活 (EMG).
- 研究结果表明,摩托神经元激活策略的重组或对抗体协作激活的增加可能解释了减少的力输出.
- 这些神经生理学变化突出了潜在的机制,这些机制有助于在运动引起的疼痛条件下导致残疾.
相关概念视频
01:29Blood and Nerve Supply to the Bones
Bones are dynamic organs that require a rich supply of oxygen and nutrients. Around 5% to 10% of the cardiac output supplies blood to the bones. A typical long bone has three main sources: the nutrient artery, the metaphyseal and epiphyseal arteries, and the periosteal arteries.
Nutrient Artery
The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
Nutrient Artery
The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
01:22Somatic Spinal Reflexes
Somatic spinal reflexes are rapid, involuntary muscular responses to external stimuli that involve the somatic musculature and the spinal cord.
One of the most well-known somatic spinal reflexes is the stretch reflex, which is activated by the sudden stretching of a muscle. This reflex involves the activation of specialized sensory receptors called muscle spindles, which are located in the muscle tissue and detect changes in the length and speed of muscle contractions. When a muscle is suddenly...
One of the most well-known somatic spinal reflexes is the stretch reflex, which is activated by the sudden stretching of a muscle. This reflex involves the activation of specialized sensory receptors called muscle spindles, which are located in the muscle tissue and detect changes in the length and speed of muscle contractions. When a muscle is suddenly...
01:20Pain
Pain serves as a critical warning signal that alerts the body to potential or actual harm. When mechanical pressure on the skin is intense, such as from a sharp pinch, the sensation transitions from touch to pain. Similarly, extreme temperatures, like a hot pot handle, convert the sensation of heat into pain. Pain can also result from overstimulation of other senses, such as blinding light, loud noise, or the intense heat from habañero peppers. This ability to sense pain is essential for...