CIFI2D, Faculty of Sport, University of Porto, Porto, Portugal.
Hum Mov Sci. 2012 Oct;31(5):1200-12. doi: 10.1016/j.humov.2012.01.006. Epub 2012 Aug 24.
The aim of the present study was to examine the inter-subject variability in inter-arm coordination during front crawl swimming at high intensity. Ten male competitive swimmers swam 200m front crawl at race pace. Two above water and four underwater cameras videotaped the test and APAS was used to assess the 3D anatomical points position and to calculate, afterwards, the angular position, velocity and the continuous relative phase, which was used to analyze upper limbs coupling during two arm stroke cycles for each 50 m lap of the 200 m front crawl event. The kinematics of the two arm stroke cycles was filtered and normalized to the total cycle duration. A significant decrease, caused by fatigue, was observed in the biomechanical and coordinative (temporal) parameters. The topography of the mean continuous relative phase curve showed a higher inter-subject variability between two groups (63.1° vs. 76.0°; p<.05), suggesting that several profiles of inter-limb coordination exist. Two clusters arose from the coordination profiling, which mainly stemmed from organismic constraints (i.e., the swimmer's technique).
本研究旨在探讨高强度自由泳时双臂间协调的个体间变异性。10 名男性竞技游泳运动员以比赛速度游 200 米自由泳。两个水面摄像机和四个水下摄像机拍摄了测试视频，APAS 用于评估 3D 解剖点位置，并随后计算角度位置、速度和连续相对相位，用于分析每个 50 米 200 米自由泳分段的两个臂划周期的上肢耦合。两个臂划周期的运动学被过滤并归一化为总周期持续时间。由于疲劳，生物力学和协调（时间）参数观察到显著下降。连续相对相位曲线的地形显示两个组之间存在更高的个体间变异性（63.1°对 76.0°；p<.05），表明存在几种肢体间协调模式。协调分析产生了两个聚类，主要源于生物体的限制（即游泳者的技术）。
