在单2000米划船比赛中,自行车内速度的变化
Joana Leão1,2, Ricardo Cardoso1,2, Jose Arturo Abraldes3
1Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, 4200-450 Porto, Portugal.
Sensors (Basel, Switzerland)
|August 14, 2025
概括
这项研究发现,男性手比女性的速度更快,技术指数更好. 虽然两种性别都使用类似的节奏,但性能差异与周期内速度变化和每周期的距离有关.
科学领域:
- 运动科学 运动科学 运动科学
- 生物力学 生物力学
- 人类运动分析 人类运动分析
背景情况:
- 划船性能取决于循环运动期间推进力和阻力力之间的相互作用.
- 了解循环内速度变化 (IVV) 以及它与生物力学因素的关系对于优化划船技术至关重要.
- 之前的研究已经探索了划船的各种生物力学方面,但需要对IVV与单人划船的性能进行详细的分析.
研究的目的:
- 为了研究周期内速度变化 (IVV) 与男性和女性单人飞行员的关键生物力学和性能变量之间的关联.
- 为了比较男性和女性划船者之间的这些变量.
- 分析节奏策略和疲劳对速度变化的影响.
主要方法:
- 23名经验丰富的单人滑板运动员 (10名女性) 参加了2000米的比赛.
- 使用GPS (15 Hz) 记录了船的速度和位置.
- 使用三轴加速度计 (100 Hz) 测量了划船周期速率,从而可以计算每周期的距离,IVV,速度变化系数 (CVV) 和技术指数.
主要成果:
- 与女性手相比,男性手的平均速度,最大速度,最小速度,每周期的距离,CVV和技术指数显著更高.
- 在男性中,平均速度与IVV,CVV和周期率相关;在女性中,平均速度与每周期的距离和技术指数相关 (在两性中都显著).
- 男女手都采用了类似的节奏策略,CVV保持一致,这表明它不会受到疲劳的显著影响.
结论:
- 男性和女性单人飞行员之间的生物力学和性能变量存在显著差异,男性表现出优异的指标.
- 速度和IVV/CVV之间的关系在两性之间存在差异,可能是由于人类学因素造成的.
- 每个周期的距离是性能的一个关键决定因素,特别是在技术指数方面,这凸显了它对男性和女性手的重要性.
相关概念视频
Velocity and Acceleration in Steady and Unsteady Flow
163
In fluid mechanics, velocity and acceleration are key concepts for analyzing particle motion in both steady and unsteady flow. Consider a fluid particle moving along a pathline, where its velocity depends on its position and time. The particle's acceleration is obtained by differentiating the velocity with respect to time.
The acceleration can be generalized to any point in the flow, and expressed as components along three perpendicular directions, representing changes in velocity over...
The acceleration can be generalized to any point in the flow, and expressed as components along three perpendicular directions, representing changes in velocity over...
163
Average Velocity
19.6K
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...
19.6K
Relative Velocity in Two Dimensions
7.6K
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...
7.6K
Instantaneous Velocity - II
10.0K
Instantaneous velocity is the quantity that measures how fast an object is moving along its path. In other words, the instantaneous velocity of an object is the limit of the average velocity as the elapsed time approaches zero, or the derivative of displacement with respect to time. Like average velocity, the instantaneous velocity is a vector with the dimensions of length per unit time. Instantaneous velocity can have both positive and negative values. The instantaneous velocity can be...
10.0K
Rapidly Varying Flow
138
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
138
Instantaneous Velocity - I
14.9K
The average velocity during a time interval cannot tell us how fast or in what direction a particle is moving at any given time during the interval. To calculate this, it is important to know the instantaneous velocity, which is the velocity at a specific instant of time or at a specific point along the path. Instantaneous velocity is the quantity that measures how fast an object is moving along its path. In other words, the instantaneous velocity vx of an object is the limit of the average...
14.9K


