在女性职业排球运动员的垂直跳力-时间指标中,开始者与非开始者的差异
Damjana V Cabarkapa1, Dimitrije Cabarkapa1, Andrew C Fry1
1Jayhawk Athletic Performance Laboratory-Wu Tsai Human Performance Alliance, Department of Health, Sport and Exercise Sciences, University of Kansas, Lawrence, KS, United States.
Frontiers in sports and active living
|April 9, 2024
概括
职业女排球员谁开始和那些谁替换表现没有显著差异在反运动垂直跳 (CMJ) 的表现. 这表明出发位置可能更多地取决于体育特定技能,而不是CMJ指标.
科学领域:
- 运动科学 运动科学 运动科学
- 生物力学 生物力学
- 人类运动 人类运动
背景情况:
- 反运动垂直跳跃 (CMJ) 是运动员下部神经肌肉功能的关键评估.
- 了解首发球员和替补球员之间的表现差异可以为训练和选择策略提供信息.
研究的目的:
- 调查CMJ特征在职业女排球员的首发和替换球员之间的差异.
- 确定CMJ表现是否是精英女排首发阵容选择的差异化因素.
主要方法:
- 19名职业女排球员在没有手臂摆动的情况下进行了三次最大力度的CMJ.
- 数据采集使用单轴力板系统 (1000 Hz采样速率).
- 分析的关键指标包括力-时间数据,跳跃高度和反应强度指数-修改.
主要成果:
- 在CMJ异常或同心阶段中,在开始者和非开始者之间没有发现统计学上显著的差异 (p > 0.05).
- 观察到的差异的影响大小小小到中等 (g = 0.053-0.683).
- 两组均表现出CMJ值在职业女排球员预期范围之内.
结论:
- 在这个队伍中,CMJ的表现似乎不是在首发和替换球员之间显著的差异化因素.
- 在职业排球中,首发阵容的选择可能更多地依赖于运动特定的技能,如阻和进攻.
- 建议进行进一步的研究,以探索影响起始位置的其他因素.
相关概念视频
Velocity Potential
366
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:
366
Force and Momentum
15.8K
Force and momentum are intimately related. Force acting over time can change momentum, and Newton's second law of motion can be stated in its most broadly applicable form in terms of momentum. Momentum can be applied to systems where the mass is changing, such as rockets, as well as to systems of constant mass. Also, momentum continues to be a key concept in the study of atomic and subatomic particles in quantum mechanics. One can consider systems with varying mass in some detail; however,...
15.8K
Standard Deviation
16.4K
The most commonly used measure of variation is the standard deviation. It is a numerical value measuring how far data values are from their mean. The standard deviation value is small when the data are concentrated close to the mean, exhibiting slight variation or spread. The standard deviation value is never negative, it is either positive or zero. The standard deviation is larger when the data values are more spread out from the mean, which means the data values are exhibiting more variation.
16.4K
Motion of a Projectile
795
Projectile motion becomes evident when a player kicks the ball into the air. The launch angle, or the angle at which the ball is kicked, plays a crucial role in determining the trajectory of the projectile. As the ball soars through the air, influenced solely by gravity, its motion can be dissected into two independent velocity components: the horizontal and the vertical.
Horizontal motion, governed by the initial kick, maintains a constant velocity throughout the flight of the soccer ball.
Horizontal motion, governed by the initial kick, maintains a constant velocity throughout the flight of the soccer ball.
795


