1、4300 英文单词, 2.2 万英文字符 , 中文 6750 字 文献出处: Estevan I , Jandacka D , Falco C . Effect of stance position on kick performance in taekwondoJ. J Sports Sci, 2013, 31(16):1815-1822. Effect of stance position on kick performance in taekwondo ISAAC ESTEVAN, DANIEL JANDACKA, & CORAL FALCO Abstract In taekwondo,
2、 the stance position can potentially affect kick performance. The aim of this study was to analyse mechanical variables in the roundhouse kick in taekwondo according to three stance positions (0, 45, 90). Nine experienced taekwondo athletes performed consecutive kicking trials in a random order acco
3、rding to these three relative positions of the feet on the ground. Measurements for the mechanical analysis were performed using two 3D force plates and an eight- camera motion capture system. The taekwondo athletes reaction and execution times were shorter when starting from the 0 and 45 stance pos
4、itions than from the 90 position (P 0.8 indicated a large effect, 0.80.5 a moderate effect, 0.50.2 a small effect, and 0.8 表示效果大, 0.8-0.5表示中等效果, 0.5-0.2 表示小效果, 0.2 表示 微不足道的效果 ( Cohen, 1988)。 表 2.来自 ANOVA 的科恩 d 值对每一个有意义的成对比较 结果 表 1 列出了三个姿势位置的所有生物力学变量(反应和执行时间,地面反作用力,大腿,胫骨和脚的速度)的统计数据。 在地面反作用力峰值和执行时间之间的
5、每个站立位置都发现了显着的负相关( r0 = -0.93; r45 = -0.79; r90 = -0.94)( P 0.01)。此外,对于每个姿势位置,力的峰值与大腿的速度正相关( r0 = 0.84; r45 = 0.76; r90 = 0.73)和小腿( r0 = 0.71; r45 = 0.68; r90 = 0.77)( P 0.05)。地面反作用力的峰值 x 对于每个站立位置与大腿 x 的速度呈正相关( r0 = 0.75; r45 = 0.72; r90 = 0.76)和小腿 x( r0 = 0.72; r45 = 0.65; r90 = 0.69)( P 0.05)。地面反作用
6、力 y 的峰值对于每个姿势位置与小腿 y 的速度呈正相关 ( r0 = 0.72; r45 = 0.65; r90 = 0.80)( P 0.05)。最后,地面反作用力的峰值 z 与每个站立位置与大腿 z 的速度相关( r0 = 0.84; r45 = 0.80; r90 = 0.81),小腿 z( r0 = 0.75; r45 = 0.67; r90 = 0.81),和脚 z( r0 = 0.67; r45 = 0.78; r90 = 0.74)( P 0.05)。 重复测量的单因素方差分析显示主效应:反应时间( F( 1.4,10.9) = 53.11; P 0.001; SP = 1.00),执行时间( F( 2,15.7) = 218.89; P 0.001 ; SP = 1.00),地面反作用力 y( F( 1.3,10.3) = 42.16; P 0.001; SP = 1.00),大腿速度 x( F( 2,15.6) = 11.65; P 0.01; SP = 0.85)。对于配对比较调整的 Bonfer