在加快撞击中增加运动幅度可以提高接触速度,而不会影响方向精度或运动变量
Victor Hugo Alves Okazaki1, Luis Augusto Teixeira2
1Laboratório de Neurociências Motoras, Universidade Estadual de Londrina, Londrina, Brazil.
Journal of motor behavior
|October 14, 2024
概括
在弹道打击任务中增加运动幅度可以提高接触速度,但不会影响方向准确性或运动变化. 这一发现与优化体育表现有关.
科学领域:
- 生物力学 生物力学
- 发动机控制器的控制器
- 运动科学 运动科学 运动科学
背景情况:
- 与运动相关的弹道技能,例如在高尔夫球或棒球中击球,需要快速而精确的运动.
- 优化这些技能需要了解运动参数如何影响速度和准确性等性能结果.
研究的目的:
- 为了研究不同运动幅度在弹道弹道击中任务期间对方向精度的影响.
- 分析与撞击行动中不同运动幅度相关的动力学变化.
主要方法:
- 参与者使用手动手柄执行弹道打击任务,以推进磁盘向目标.
- 测试了五种不同的运动幅度 (11.5厘米到27.5厘米).
- 动力学分析被用来评估手柄,圆盘和上肢关节 (肩膀,肘部,手腕) 的运动.
主要成果:
- 较大的运动幅度导致加速阶段延长,手柄和手臂关节的峰值速度延迟.
- 增加的运动幅度导致了更高的接触和的峰值线性速度,以及在肩和肘部更大的角度速度.
- 没有观察到运动幅度对推进盘的方向准确性或可变性的显著影响.
- 接触速度,峰值速度和峰值速度时间的变化在肩膀,肘部和手腕的不同运动幅度中保持一致.
结论:
- 在弹道击中任务中,较大的运动幅度会增加撞击的速度.
- 运动幅度似乎不是影响击中方向准确性或一致性的关键因素.
- 这些发现表明,教练和运动员可以专注于其他参数来提高准确性,同时可能利用更大的振幅来增加功率.
相关概念视频
01:19Impact Loading
191
Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
In cases of elastic deformation,...
191
01:26Impact: Problem Solving
221
In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
221
01:22Non-uniform Circular Motion
7.1K
In uniform circular motion, the particle executing circular motion has a constant speed, and the circle is at a fixed radius. However, not all circular motion occurs at a constant speed. A particle can travel in a circle and speed up or slow down, showing an acceleration in the direction of motion. In that case, the motion is called non-uniform circular motion, and an additional acceleration is introduced, which is in the direction tangential to the circle.
For example, such...
For example, such...
7.1K
01:06Forced Oscillations
6.5K
When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
6.5K
01:12Average Velocity
18.2K
To calculate the other physical quantities in kinematics, we must introduce the time variable. The time variable allows us not only to state the position of the object during its motion, but also how fast it is moving. The speed at which an object is moving is given by the rate at which the position changes with time. For each position xi, we assign a particular time ti. If the details of the motion at each instant are not important, the rate is usually expressed as the average velocity. This...
18.2K
01:22Muscle Stimulation Frequency
2.0K
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...
2.0K