Phase analysis in maximal sprinting: an investigation of step-to-step technical changes between the initial acceleration, transition and maximal velocity phases
Phase analysis in maximal sprinting: an investigation of step-to-step technical changes between the initial acceleration, transition and maximal velocity phases
复制标题
最大冲刺阶段分析：对初始加速、过渡和最大速度阶段之间逐步技术变化的研究
作者：
Hans C von Lieres Und Wilkau;G. Irwin;N. Bezodis;Scott Simpson;I. Bezodis
摘要本研究的目的是研究短跑初始加速、过渡和最大速度阶段之间的时空和运动学变化。使用六个高清摄像机收集了五名经验丰富的短跑运动员进行50米最大冲刺时的矢状面运动学数据。在手动数字化之后，计算了触地和脚趾离开时的时空和运动学变量。通过质心高度和节段角度的逐级变化来识别过渡阶段的开始和结束。计算每个阶段的时空变量和运动学变量的平均步长变化。首先，这项研究表明，如果有足够的试验可用，小腿和躯干角度的逐步变化可能会提供一种适当的测量方法来检测应用环境中的冲刺阶段。然而，考虑到重心高度的变化代表了更全面的衡量标准，这被用来将短跑细分为不同的阶段。其次，在初始加速阶段，与过渡阶段相比，触地运动学有较大的逐级变化。在脚趾离开时，在最大速度阶段，在平台期之前的初始加速阶段和过渡阶段，步幅到步幅的运动学变化是一致的。这些结果为教练和练习者提供了有价值的洞察最大短跑阶段之间的关键差异的见解。
Abstract The aim of this study was to investigate spatiotemporal and kinematic changes between the initial acceleration, transition and maximum velocity phases of a sprint. Sagittal plane kinematics from five experienced sprinters performing 50-m maximal sprints were collected using six HD-video cameras. Following manual digitising, spatiotemporal and kinematic variables at touchdown and toe-off were calculated. The start and end of the transition phase were identified using the step-to-step changes in centre of mass height and segment angles. Mean step-to-step changes of spatiotemporal and kinematic variables during each phase were calculated. Firstly, the study showed that if sufficient trials are available, step-to-step changes in shank and trunk angles might provide an appropriate measure to detect sprint phases in applied settings. However, given that changes in centre of mass height represent a more holistic measure, this was used to sub-divide the sprints into separate phases. Secondly, during the initial acceleration phase large step-to-step changes in touchdown kinematics were observed compared to the transition phase. At toe-off, step-to-step kinematic changes were consistent across the initial acceleration and transition phases before plateauing during the maximal velocity phase. These results provide coaches and practitioners with valuable insights into key differences between phases in maximal sprinting.
DOI：
10.1249/mss.0b013e318162d162
发表时间：
2008-04-01
期刊：
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
影响因子：
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作者：
Bezodis, Ian N.;Kerwin, David G.;Salo, Aki I. T.
通讯作者：
Salo, Aki I. T.