相关实验视频
Updated: May 14, 2025

08:12
Experimental Methods to Study Human Postural Control
Published on: September 11, 2019
9.4K
下肢共收缩和步行过程中的冲动之间的关系
Toshinori Miyashita1,2, Kengo Kawanishi1,3, Shintarou Kudo1,3,4
1Inclusive Medical Sciences Research Institute, Morinomiya University of Medical Sciences, Nankokita 1-26-16, Suminoe Ward, Osaka 559-8611, Japan.
Sensors (Basel, Switzerland)
|April 12, 2025
概括
老年人的步行表现出增加的协同收缩 (CC) 与减少的平滑性有关. 这项研究发现,下腿抽与下肢CC有显著的相关性,特别是在广侧面肌和腹半侧面肌肌中.
科学领域:
- 生物力学 生物力学
- 老年学是一门学科.
- 神经学 神经学
背景情况:
- 老年人经常在步行过程中表现出增加的合收缩 (CC),导致运动流性降低.
- 冲动是衡量加速度变化速率的指标,是运动顺的公认定量指标.
研究的目的:
- 研究中老年人和老年人的步行过程中下腿抽和下肢合收缩 (CC) 之间的关系.
- 为了确定下腿抽是否是影响步行过程中CC的重要因素,特别是在老年人中.
主要方法:
- 参与者:30名健康的中老年人和老年人.
- 测量:用惯性测量单元 (IMU) 测量下肢肌肉 (前肌,后胃肌,后大腿肌,大腿) 和下腿运动的表面电肌图 (EMG).
- 分析:从IMU数据计算冲动,使用百分比合收缩指数 (CCI) 量化CC,并进行多重回归分析以将冲动和CCI相关联,根据年龄和步行速度进行调整.
主要成果:
- 在立场阶段的后半段,大侧骨和腹膜侧骨 (VLGL) 的合收缩指数 (CCI) 与较高的下腿抽增加.
- 还发现VLGL CCI随着步行速度的下降和年龄的增长而增加.
- 多重回归分析证实了下腿抽和VLGL CCI之间的显著关系,即使经过对年龄和步行速度进行调整.
结论:
- 下腿抽是与老年人行走过程中下肢共收缩 (CC) 相关的关键因素.
- 这些发现表明,增加下腿动有助于改变步态模式,并减少老年人的光滑.
- 了解这种关系可以为旨在改善步行稳定性和降低老龄人口中跌倒风险的干预措施提供信息.
相关概念视频
Excitation-Contraction Coupling in Skeletal Muscles
7.5K
Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action...
When an action...
7.5K
Motor Unit Stimulation
1.3K
When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
1.3K
Isotonic and Isometric Muscle Contractions
2.4K
Two primary types of muscle contractions are isotonic and isometric, each serving unique functions and involving distinct mechanisms. Both isotonic and isometric contractions are integral to the body's complex system of movement and stability. Isotonic exercises contribute significantly to functional strength and movement, while isometric contractions are crucial for maintaining posture and joint stability.
Isotonic contractions
Isotonic contractions occur when a muscle changes length while...
Isotonic contractions
Isotonic contractions occur when a muscle changes length while...
2.4K
Muscle Stimulation Frequency
1.9K
The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
1.9K
Muscles of the Leg that Move the Foot and Toes
1.1K
The human leg comprises an intricate system of muscles that facilitate the movement of feet and toes. Within this system, the muscles are categorized into the anterior, lateral, and posterior compartments, each with a unique set of muscles carrying out specific functions.
Anterior Compartment
The anterior compartment includes muscles that contribute to the dorsiflexion of the foot. This compartment houses the tibialis anterior, extensor hallucis longus, and extensor digitorum longus muscles....
Anterior Compartment
The anterior compartment includes muscles that contribute to the dorsiflexion of the foot. This compartment houses the tibialis anterior, extensor hallucis longus, and extensor digitorum longus muscles....
1.1K
Ankle Joint
1.3K
The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
1.3K

