衰老和体重指数对上肢运动单元数指数和大小的影响
Lauren I Gulley Cox1, Nicholas Dias2, Chuan Zhang2
1Department of Health and Human Performance, University of Houston, Houston, TX, United States.
Experimental biology and medicine (Maywood, N.J.)
|August 8, 2025
概括
年长的成年人与年轻的成年人相比,在运动单元数指数 (MUNIX) 中没有差异. 然而,人体质量指数 (BMI) 影响运动单元大小指数 (MUSIX),可能会混老年人群的表面电肌图 (EMG) 发现.
科学领域:
- 神经学 神经学
- 老年学是一门学科.
- 生物医学工程 生物医学工程
背景情况:
- 衰老与神经肌肉系统的变化有关,包括运动单元特征的改变.
- 了解运动单元数量和大小与年龄相关的变化对于评估老年人神经肌肉功能至关重要.
- 以前的研究表明,随着年龄的增长,运动单元数量可能会下降,但研究结果可能会因人体成分而混.
研究的目的:
- 为了比较老年人 (60岁以上) 与年轻健康的成年人 (20-30岁) 的上肢运动单元数量和尺寸.
- 调查年龄组之间的各种上肢肌肉运动单元大小的潜在差异.
- 检查身体质量指数 (BMI) 与运动单元数和大小在两个年龄组之间的关联.
主要方法:
- 在五个上肢肌肉中评估了复合肌肉动作潜力 (CMAP),运动单元数指数 (MUNIX) 和运动单元大小指数 (MUSIX).
- 老年人和年轻的健康成年人之间的比较测量.
- 分析了身体质量指数 (BMI) 对运动单元参数的影响.
主要成果:
- 在老年人和年轻人之间没有发现MUNIX的显著差异.
- 在CMAP中,群体差异归因于BMI,而MUSIX差异不受BMI的影响.
- 体重指数显示了跨群体的影响,表明其在神经肌肉评估中的作用.
结论:
- 虽然这项研究提供了与年龄相关的运动单元变化的证据,但身体成分 (例如脂肪) 可能会混表面电肌图 (EMG) 的发现.
- 未来的EMG研究,特别是在BMI较高的人群中,应该考虑脂肪度估计,以获得更准确的结果.
- 这些发现强调了在评估老年人的神经肌肉功能时考虑BMI的重要性.
相关概念视频
01:13Motor Units
4.6K
The motor unit is a fundamental component of the neuromuscular system and plays a crucial role in coordinating muscle contractions. It consists of a somatic motor neuron, which connects and controls multiple skeletal muscle fibers, forming a single functional segment. The axon of the motor neuron branches out and establishes synaptic connections known as neuromuscular junctions with individual muscle fibers within the motor unit.
Motor units come in different sizes, with smaller units...
Motor units come in different sizes, with smaller units...
4.6K
01:19The Effect of Aging on Tissues
2.5K
Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
2.5K
01:29Bone Disorders
3.9K
Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
3.9K