使用优化算法和坐标上升方法,将95%的置信面积和体积与体位图中的压力中心和质量中心相结合
Mohsen Alighanbari1, Sina Alighanbari2, Lisa Griffin1
1Department of Kinesiology and Health Education, University of Texas, Austin, 78712, TX, USA.
Computers in biology and medicine
|December 27, 2024
概括
一个新的坐标上升优化算法通过提供比传统方法更准确和精确的压力中心 (CoP) 和质量中心 (CoM) 测量来改善平衡控制分析.
科学领域:
- 生物力学和运动控制
- 人类运动分析 人类运动分析
- 稳定计测试是一种稳定测试.
背景情况:
- 平衡控制对于日常活动至关重要,并使用压力中心 (CoP) 和质量中心 (CoM) 来评估.
- 目前的稳定计方法,如主要成分分析 (PCA) 和共变性有局限性,包括正常性假设和样本大小灵敏度.
- 这些限制可能会影响余额评估的准确性和可靠性.
研究的目的:
- 引入和评估一个坐标上升优化算法来分析CoP和CoM数据.
- 在准确性,精度和稳定性方面,比较优化算法的性能与传统方法 (PCA,共变量,数据修剪器) 的性能.
- 为了确定优化方法是否为检测平衡控制中的变化提供了更好的灵敏度.
主要方法:
- 开发了一个坐标上升优化算法,并应用于15名健康成年人从坐到站任务中获得的CoP和CoM数据.
- 用于对五种分布类型的15,000个CoM和CoP数据点的模拟进行了可靠的分析.
- 进行比较的方法包括优化算法,数据修剪器,PCA和共变量,并使用重复测量ANOVA进行统计分析.
主要成果:
- 与PCA和共变量方法相比,优化算法在CoP和CoM数据中包含了较小的圆/圆形,证明了更高的准确性,精度和稳定性.
- 虽然优化方法比数据修剪器产生了更大的圆,但它的结果更准确和精确.
- 优化方法对勒普科尔特数据的估计误差略高,但总体而言,其灵敏度优于其他方法.
结论:
- 坐标上升优化算法代表了在稳定计中分析CoP和CoM数据的优质方法.
- 这种先进的方法提供了更高的准确性,精度和稳定性,从而导致更可靠的平衡控制评估.
- 优化算法的提高灵敏度具有显著的潜力,可以检测病理条件中的微妙平衡变化.
相关概念视频
Finding the Center of Gravity
3.4K
The center of gravity of a body is an imaginary point where the body's total weight is assumed to be concentrated, and the body is perfectly balanced. The center of the mass of a body is a point at which the whole of the mass of the body appears to be concentrated. If the acceleration due to gravity, g, has the same value at all points on a body, its center of gravity is identical to its center of mass. The center of gravity of homogeneous bodies such as a sphere, cube, or rectangular plate...
3.4K
Moments of Inertia for an Area about Inclined Axes
639
In physics and engineering, understanding the moments of inertia for a given area with asymmetrical mass distribution is critical for proper design and analysis. When considering an arbitrary coordinate system, the moments of inertia can be obtained by integrating the moment of inertia for an infinitesimal area element.
639
Center of Mass: Introduction
14.0K
Any object that obeys Newton's second law of motion is made up of a large number of infinitesimally small particles. Objects in motion can be as simple as atoms or as complex as gymnasts performing in the Olympics. The motion of such objects is described about a point called the center of mass of the object. The center of mass of an object is a point that acts as if the whole mass is concentrated at that point. The center of mass of an object with a large number of infinitesimally small...
14.0K
Center of Gravity
4.9K
The center of gravity (COG) of an object is the point where the object's total weight is considered to be concentrated. Knowing the location of the center of gravity is useful when predicting the behavior of a moving object or designing static structures. In a uniform gravitational field, the center of gravity is similar to the center of mass (COM); yet, these two points can be positioned differently. For example, the Moon's center of mass lies very close to its geometric center, but...
4.9K
Mass Moment of Inertia: Problem Solving
289
Knowing how to determine the moment of inertia in a wheel's axle can be invaluable in engineering and automotive applications. It provides an understanding of how changes in geometry, mass, and radius can impact its performance.
The axle can be approximated to a solid cylinder with longitudinal and perpendicular axes. Initially, a thin disc is considered parallel to the circular face of the cylinder.
The axle can be approximated to a solid cylinder with longitudinal and perpendicular axes. Initially, a thin disc is considered parallel to the circular face of the cylinder.
289
Centroid of a Body: Problem Solving
1.1K
The centroid of a body is a crucial concept in engineering and physics. Finding the centroid of a body can help determine its stability, its balance point, and even its design. In this context, consider a thin wire bent in the form of a quarter circular arc. Polar coordinates are used to calculate the centroid. The wire is first divided into small differential elements of a length equal to the radius multiplied by the differential angle.
The x-coordinates and y-coordinates of each element's...
The x-coordinates and y-coordinates of each element's...
1.1K


