相关实验视频
Updated: Feb 28, 2026

10:53
A Novel Application of Musculoskeletal Ultrasound Imaging
Published on: September 17, 2013
24.7K
探索速度问题线性位置转换器在背和长椅压力中的有效性
Emanuele Dello Stritto1, Antonio Gramazio1, Ruggero Romagnoli2
1Department of Human Movement and Health Sciences, University of Rome "Foro Italico", Piazza L. De Bosis 15, 00135 Rome, Italy.
Sensors (Basel, Switzerland)
|February 27, 2026
概括
速度问题线性编码器显示了在0.87m/s以下的背 (SQ) 期间监测平均速度 (MV) 的潜力. 然而,它缺乏用于所有负载的长板压力 (BP) 速度跟踪所需的准确性.
科学领域:
- 运动科学 运动科学 运动科学
- 生物力学 生物力学
- 运动生理学 运动生理学
背景情况:
- 准确测量杆速度对于抵抗训练至关重要.
- 线性位置传感器 (LPT) 通常用于评估速度.
- 对新的LPT与参考标准的验证对于可靠的数据至关重要.
研究的目的:
- 为了验证Velocity Matters LPT与GymAware参考标准进行验证.
- 为了比较背 (SQ) 和长椅压力 (BP) 练习期间的平均速度 (MV) 和峰值速度 (PV) 测量.
- 为了评估各种速度范围和运动类型的速度问题准确性.
主要方法:
- 在SQ和BP期间,使用GymAware和Velocity Matters同时记录条杆速度.
- 15名男性参与者在5个定义的速度范围内进行了重复.
- 使用皮尔森相关性,MAE,布兰德-阿尔特曼图表,ICC和CCC来评估有效性.
主要成果:
- 在所有条件中都观察到良好的至极好的相关性 (皮尔森的r).
- 在SQ的MV (<1.00 m/s) 和BP的MV/PV (<0.70 m/s) 中发现了可接受的平均绝对误差 (MAE).
- 布兰德-阿尔特曼分析显示,Velocity Matters系统地低估了它的价值,并且达成一致的范围很大.
结论:
- 对于在0.87m/s以下的SQ中监测MV时,可以谨慎地使用速度问题.
- 该设备在所有负载中无法提供足够的准确性来评估BP速度.
- 可能需要进一步的研究,以提高针对特定阻力训练应用的速度问题的准确性.
相关概念视频
Velocity and Position by Graphical Method
11.0K
Velocity and position can be calculated from the known function of acceleration as a function of time. The total area under the acceleration-time graph and the velocity-time graph gives the change in velocity and position, respectively. In the case of an airplane, its acceleration is tracked using the inertial navigation system. The pilot provides the input of the airplane's initial position and velocity before takeoff. The inertial navigation system then uses the acceleration data to...
11.0K
Velocity and Position by Integral Method
8.7K
If acceleration as a function of time is known, then velocity and position functions can be derived using integral calculus. For constant acceleration, the integral equations refer to the first and second kinematic equations for velocity and position functions, respectively.
Consider an example to calculate the velocity and position from the acceleration function. A motorboat is traveling at a constant velocity of 5.0 m/s when it starts to decelerate to arrive at the dock. Its acceleration is...
Consider an example to calculate the velocity and position from the acceleration function. A motorboat is traveling at a constant velocity of 5.0 m/s when it starts to decelerate to arrive at the dock. Its acceleration is...
8.7K
Relative Motion Analysis - Velocity
841
A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
841
Relative Velocity in Two Dimensions
9.2K
Relative velocity is the velocity of an object as observed from a particular reference frame, or the velocity of one reference frame with respect to another reference frame. The concept of relative velocity can be used to describe motion in two dimensions. Consider a particle P and two reference frames S and S′. The position of the origin of S′ as measured in S is , the position of P as measured in S′ is , and the position of P as measured in S is , which can be evaluated by utilizing...
9.2K
Velocity Potential
787
In steady, incompressible flow through a long, straight pipe with a uniform cross-section, the flow in the central region (far from the pipe walls) is irrotational. This irrotational nature means that fluid particles do not rotate around their axes, and a scalar function called the velocity potential, represented by ϕ, can be used to describe their movement. In irrotational flows, the velocity field V is defined as the gradient of the velocity potential:
787

