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相关概念视频

Dynamic Equilibrium02:20

Dynamic Equilibrium

A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
Frictional Forces on Flat Belts01:28

Frictional Forces on Flat Belts

Flat belts are commonly used in various industrial applications for transmitting power from one pulley to another. When a flat belt is wrapped around a set of pulleys, it experiences different tensions at the driving pulley ends due to the friction between the belt and pulley surface. When the pulley moves in a counterclockwise direction, the tension T2 on the opposite side of the pulley where the belt is moving away from is higher than the tension T1 on the side where the belt is moving...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...

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在不平坦地形行走期间,电皮质动态的年龄差异.

Chang Liu1,2, Erika M Pliner1,3, Jacob Salminen1

  • 1Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA.

bioRxiv : the preprint server for biology
|November 24, 2025
PubMed
概括

与年轻人相比,老年人在不平坦的地形上表现出增加的步态变化和减少的大脑活动调制. 这表明皮层灵活性下降可能会影响衰老中的移动性.

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科学领域:

  • 神经科学是一个神经科学.
  • 生物力学 生物力学
  • 老年学是一门学科.

背景情况:

  • 随着年龄的增长,步态控制变得不那么自动,这影响了在具有挑战性的表面上的移动性.
  • 使用高密度脑电图 (EEG) 的移动脑成像可以了解与年龄相关的移动性下降的神经机制.

研究的目的:

  • 在不平坦地形行走时,量化与年龄相关的大脑活动 (电皮质动力学) 的差异.
  • 为了比较年轻人和老年人之间的平均和步骤内脑活动变化.

主要方法:

  • 31名年轻人和71名老年人走在不同难度的不平坦地形跑步机上.
  • 高密度脑电图 (EEG) 记录了大脑活动,分析了α和β频段的功率光谱变化.
  • 测量了步行参数,如步骤持续时间和十字路口外行的变化.

主要成果:

  • 老年人显示,随着地形不均,步态变化 (步数持续时间,十字路口游览) 的增加更大.
  • 这两个年龄组在不平坦的地形上表现出广泛的脑活动变化,特别是在α和β波段.
  • 较年轻的成年人与不平坦的地形相比,尾角α/β功率的减少更大;较年长的成年人在不平坦的地形上显示出较少的调制和增加的尾活动波动.

结论:

  • 年长的成年人表现出增加的步态变化,但皮质网络的灵活性降低,由缺乏与任务相关的大脑活动调节所表明.
  • 老年人脑脊活动调节的减少表明,即使在稳定的表面上,视觉处理也可能过度依赖视觉处理,从而限制了对不平坦地形的适应能力.