Kinematic and kinetic evidence for functional lateralization in a symmetrical motor task: the water polo eggbeater kick
Kinematic and kinetic evidence for functional lateralization in a symmetrical motor task: the water polo eggbeater kick
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DOI：
10.1007/s00221-014-4166-8
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发表时间：
2015-03-01
影响因子：
2
通讯作者：
Sanders, Ross H.
中科院分区：
文献类型：
--
作者：
Oliveira, Nuno;Sanders, Ross H.
双侧性和运动侧化与神经侧化有关，表明显性和非显性系统可能具有不同的专门化。对称运动任务的研究可以为这一假设提供证据。水球打蛋腿是一种由左右下肢的反相和方向相反的旋转组成的技术，以提供向上的推力来提升身体。该技巧的有效性取决于双脚主要在水平方向上移动，并且在整个循环中尽可能多地产生升力。本研究的目的是探讨在水球打蛋踢腿技术的执行过程中，优势(D)和非优势（ND）下肢的运动侧化。12名右手和右脚水球运动员在垂直位置进行打蛋踢，以保持最大高度。三维运动学和垂直力的模式被量化为每个球员的9个周期。所产生的垂直力模式在优势肢和非优势肢的循环等效阶段之间表现出不对称性（D, 222.8 N； ND, 201.0 N; p < 0.001）。基于垂直力模式，非优势踝关节在膝关节屈曲阶段（恢复阶段）的运动效率较低。这是由等效相位的非优势脚产生的较大负俯仰角的结果。负俯仰角抵消升力负责向上推进的球员。在恢复阶段，优势侧的有效性是踝关节和髋关节在旋转和倒置运动方面的双边差异的结果。优势侧和非优势侧的技术差异，特别是在膝关节屈曲阶段，支持了“动态优势理论”，即每个半球/肢体可能被调整以控制任务表现的不同参数。
Bilaterality and motor lateralization have been associated with neural lateralization, suggesting that the dominant and non-dominant systems might have different specializations. The study of symmetrical motor tasks can provide evidence relating to this hypothesis. The water polo eggbeater kick is a skill comprising anti-phase and directionally opposite rotations of the right and left lower limbs to provide upward thrust to elevate the body. Effectiveness of the skill depends on moving the feet in predominantly horizontal directions with an orientation that produces lift throughout as much of the cycle as possible. The purpose of this study was to investigate the motor lateralization of the dominant (D) and non-dominant (ND) lower limbs during the execution of the water polo eggbeater kick technique. Twelve right-handed and right-footed water polo players performed eggbeater kicks in the vertical position to maintain maximum height. Three-dimensional kinematics and the pattern of vertical forces were quantified for nine cycles for each player. The pattern of vertical force produced showed asymmetries between the equivalent phases of the cycles of the dominant and non-dominant limbs (D, 222.8 N; ND, 201.0 N; p < 0.001). Based on the vertical force patterns, the non-dominant ankle had a less efficient motion during the phase of knee flexion (recovery phase). This was a consequence of larger negative pitch angles created by the non-dominant foot for the equivalent phase. Negative pitch angles counteract the lift forces responsible for the upward propulsion of the player. The effectiveness of the dominant side during the recovery phase was a consequence of bilateral differences in rotation and inversion motions by the ankle and hip. Differences in the technique of the dominant and non-dominant side, particularly during the phase of knee flexion, supported the 'dynamic dominance theory' where each hemisphere/limb might be tuned to control different parameters of task performance.