Chappell Andrew, Molina Sergio L, McKibben Jonathon, Stodden David F
Los Angeles Angels Baseball Club, Jonestown, TX.
Motor Control. 2016 Jul;20(3):222-32. doi: 10.1123/mc.2014-0062. Epub 2015 May 26.
This study examined variability in kicking speed and spatial accuracy to test the impulse-variability theory prediction of an inverted-U function and the speed-accuracy trade-off. Twenty-eight 18- to 25-year-old adults kicked a playground ball at various percentages (50-100%) of their maximum speed at a wall target. Speed variability and spatial error were analyzed using repeated-measures ANOVA with built-in polynomial contrasts. Results indicated a significant inverse linear trajectory for speed variability (p < .001, η2= .345) where 50% and 60% maximum speed had significantly higher variability than the 100% condition. A significant quadratic fit was found for spatial error scores of mean radial error (p < .0001, η2 = .474) and subject-centroid radial error (p < .0001, η2 = .453). Findings suggest variability and accuracy of multijoint, ballistic skill performance may not follow the general principles of impulse-variability theory or the speed-accuracy trade-off.
本研究考察了踢腿速度和空间准确性的变异性，以检验冲动变异性理论中倒U形函数预测以及速度-准确性权衡。28名18至25岁的成年人以其最大速度的不同百分比（50%-100%）向墙壁目标踢操场球。使用具有内置多项式对比的重复测量方差分析来分析速度变异性和空间误差。结果表明，速度变异性存在显著的反向线性轨迹（p < .001，η2 = .345），其中50%和60%最大速度时的变异性显著高于100%的情况。对于平均径向误差（p < .0001，η2 = .474）和受试者质心径向误差（p < .0001，η2 = .453）的空间误差得分，发现了显著的二次拟合。研究结果表明，多关节弹道技能表现的变异性和准确性可能不符合冲动变异性理论或速度-准确性权衡的一般原则。
