Exercise Physiology Laboratory, Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", Piazza Lauro De Bosis 15, 00135 Rome, Italy.
School of Sport Science Exercise and Health, Faculty of Life and Physical Sciences, The University of Western Australia M408, 35 Stirling Highway, Crawley, WA 6009, Australia.
Hum Mov Sci. 2014 Feb;33:108-19. doi: 10.1016/j.humov.2013.07.021. Epub 2013 Sep 26.
This study aimed to investigate the kicking limb coordinative patterns adopted by karate practitioners (karateka) when impacting (IRK), or not impacting (NIRK) a target during a roundhouse kick. Six karateka performed three repetitions of both kicks while kicking limb kinematics were recorded using a stereophotogrammetric system. Intra-limb coordination was quantified for hip and knee flexion-extension from toe-off to kick completion, using the Continuous relative phase (CRP). Across the same time interval, thigh and shank angular momentum about the vertical axis of the body was calculated. For all trials, across all participants, CRP curve peaks and maximum and minimum angular momentum were determined. A RM-ANOVA was performed to test for differences between kicking conditions. The CRP analysis highlighted, during the central portion of both kicks, a delayed flexion of the hip with respect to the knee. Conversely, during the terminal portion of the CRP curves, the NIRK is performed with a more in-phase action, caused by a higher hip angular displacement. The NIRK is characterized by a lower angular momentum which may enhance control of the striking limb. It would seem that the issue of no impact appears to be solved through the control of all segments of the kicking limb, in contrast to the primary control of the lower leg only observed during the IRK.
本研究旨在探讨空手道运动员（空手道选手）在进行横踢（IRK）或不踢（NIRK）时，踢腿的协调模式。6 名空手道选手在完成 3 次重复踢腿时，使用立体摄影测量系统记录踢腿的运动学数据。在足离地到踢腿完成的时间段内，采用连续相对相位（CRP）来量化髋关节和膝关节的屈伸运动。同时，计算了大腿和小腿绕身体垂直轴的角动量。对于所有试验和所有参与者，确定了 CRP 曲线的峰值和最大、最小角动量。进行了 RM-ANOVA 来检验踢腿条件之间的差异。CRP 分析表明，在两次踢腿的中心部分，髋关节相对于膝关节的伸展延迟。相反，在 CRP 曲线的终末部分，NIRK 表现出更为同步的动作，这是由于髋关节的角度位移更高。NIRK 的特征是角动量较低，这可能有助于控制击打腿。似乎通过控制踢腿的所有部分来解决无冲击的问题，这与仅在 IRK 期间观察到的对小腿的主要控制形成对比。
