Department of Sport Sciences, University of Strasbourg, France.
Res Q Exerc Sport. 2011 Mar;82(1):1-8. doi: 10.1080/02701367.2011.10599716.
The purpose of this study was to determine whether the Index of Coordination (IdC) and the propulsive phase durations can differentiate performance level during a maximal 400-m front crawl swim trial. Sixteen male swimmers constituted two groups based on performance level (G1: experts; G2: recreational). All participants swam the 400-m front crawl at maximal speed. Video analysis determined the stroke (swimming speed, stroke length, stroke rate) and coordination (IdC) parameters for every 50 m. Both stroke and coordination parameters discriminated performance level. The expert group had significantly higher values for speed and stroke length and lower values for the relative propulsive phase duration and IdC (p < .05). However there was no significant change in coordination parameters for either group throughout the trial. This suggests that, when associated with greater stroke length, catch-up coordination can be an efficient coordination mode that reflects optimal drag/propulsion adaptation. This finding provides new insight into swimmers' adaptations in a middle-distance event.
本研究旨在确定协调指数（IdC）和推进阶段时间是否可以区分最大 400 米自由泳游泳试验中的表现水平。16 名男性游泳运动员根据表现水平（G1：专家；G2：娱乐）分为两组。所有参与者均以最大速度游 400 米自由泳。视频分析确定了每个 50 米的划水（游泳速度、划水长度、划水频率）和协调（IdC）参数。划水和协调参数均能区分表现水平。专家组的速度和划水长度明显更高，相对推进阶段时间和 IdC 更低（p<.05）。然而，两个组在整个试验中都没有出现协调参数的显著变化。这表明，当与更大的划水长度相关联时，追上协调可以是一种有效的协调模式，反映了最佳的阻力/推进适应。这一发现为中距离项目中游泳运动员的适应提供了新的见解。
