在非残疾成年人中,滚动阻力,首选速度和手动轮椅推进机制之间的关系
Hunter Soleymani1, Rachel Cowan2
1University of Alabama at Birmingham Heersink School of Medicine, Birmingham, AL, USA.
Disability and rehabilitation. Assistive technology
|July 26, 2023
概括
降低轮椅滚动阻力 (RR) 会增加推进力,并可以提高机动性,同时降低上肢应变. 建议对轮椅使用者进行进一步的研究.
科学领域:
- 生物力学和人类运动科学 生物力学和人类运动科学
- 康复工程 康复工程 康复工程
- 辅助技术研究 辅助技术研究
背景情况:
- 了解轮椅使用者和系统之间的相互作用对于优化移动性和降低受伤风险至关重要.
- 滚动阻力 (RR) 是影响轮椅推进的能源消耗和生物力学的一个关键因素.
研究的目的:
- 在非残疾人中调查滚动阻力 (RR),首选推进速度和关键推进机制之间的关系.
- 描述RR的变化如何影响轮椅推力的力,频率和长度.
主要方法:
- 使用分级轮椅运动测试 (GXTsubmax) 来估计在最大工作负载时的RR.
- 一个重复测量实验涉及19个1分钟的试验,在一系列RR的自选速度.
- 记录了推进变量,包括速度,峰值力 (Fpeak),力上升率 (Fror),推进频率 (PF) 和推进长度 (PL).
主要成果:
- 增加的RR与速度降低 (r=-0.81) 和峰值力 (Fpeak) 增加 (r=0.92) 有着强烈的相关性.
- RR显示与力量上升率 (Fror) 和推力长度 (PL) 的关联较弱,与推力频率 (PF) 没有显著关系.
- 更高的速度与Fror和PF的增加有关,但Fpeak和PL的减少.
结论:
- 较高的滚动阻力需要更大的峰值推进力,但会降低自选速度.
- 降低用户系统的滚动阻力可以同时提高机动性,降低上肢的物理压力.
- 需要对实际轮椅使用者的进一步研究来证实这些发现及其临床影响.
相关概念视频
Rolling Resistance: Problem Solving
380
Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
380
Rolling Resistance
324
When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down...
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down...
324
Equation of Motion: General Plane motion - Problem Solving
205
Consider a lawn roller with a mass of 100 kg, a radius of 0.2 meters, and a radius of gyration of 0.15 meters. A force of 200 N is applied to this roller, angled at 60 degrees from the horizontal plane. What will be the angular acceleration of the lawn roller?
The friction between the roller and the ground is characterized by two coefficients. The static friction coefficient is 0.15, while the kinetic friction coefficient is 0.1. These values are crucial in understanding the interaction between...
The friction between the roller and the ground is characterized by two coefficients. The static friction coefficient is 0.15, while the kinetic friction coefficient is 0.1. These values are crucial in understanding the interaction between...
205
Rolling Without Slipping
4.1K
People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is...
4.1K
Rolling With Slipping
5.4K
Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can...
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can...
5.4K
Characteristics of Dry Friction
617
Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
617


