Changes in Speed Skating Velocity in Relation to Push-Off Effectiveness
Changes in Speed Skating Velocity in Relation to Push-Off Effectiveness
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DOI：
10.1123/ijspp.8.2.188
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发表时间：
2013-03-01
影响因子：
3.3
通讯作者：
de Koning, Jos J.
中科院分区：
文献类型：
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作者：
Noordhof, Dionne A.;Foster, Carl;de Koning, Jos J.
速度滑冰姿势或技术的特征在于蹬冰角度或有效性（e），由蹬冰腿和冰之间的角度确定;预伸膝盖角度（θ（0））;和躯干角度（θ（1））。与肌肉力量输出和环境条件一起，滑冰姿势或技术决定了速度（v）。目的：为了深入了解对有效滑冰和表现良好很重要的技术变量，在5000米世界杯期间，每一圈都要确定e，theta（0），theta（1）和滑冰v。其次，作者评估了e，θ（0）和θ（1）的变化（Delta）是否与Delta v.方法相关：一台摄像机从正面拍摄滑冰者，从中确定e。另一台摄像机从矢状面拍摄滑冰者，从中确定θ（0）和θ（1）。结果：在比赛过程中，e逐渐增加，v逐渐减少，而θ（0）和θ（1）显示出不太一致的变化模式。广义估计方程显示，在整个比赛的中段，Δ e与Δ v显著相关（β =-0.10，P
Speed skating posture, or technique, is characterized by the push-off angle or effectiveness (e), determined as the angle between the push-off leg and the ice; the preextension knee angle (theta(0)); and the trunk angle (theta(1)). Together with muscle-power output and environmental conditions, skating posture, or technique, determines velocity (v). Purpose: To gain insight into technical variables that are important to skate efficiently and perform well, e, theta(0), theta(1), and skating v were determined every lap during a 5000-m World Cup. Second, the authors evaluated if changes (Delta) in e, theta(0), and theta(1) are associated with Delta v. Methods: One camera filmed the skaters from a frontal view, from which e was determined. Another camera filmed the skaters from a sagittal view, from which theta(0) and theta(1) were determined. Radio-frequency identification tags around the ankles of the skaters measured v. Results: During the race, e progressively increased and v progressively decreased, while theta(0) and theta(1) showed a less consistent pattern of change. Generalized estimating equations showed that Delta e is significantly associated with Delta v over the midsection of the race (beta = -0.10, P