武术散打鞭腿动作二次发力特征剖析

Characteristics of the Second Exertion of Force in Sanda's Whip-Kick

应用三维影像测量系统,测试支撑腿和进攻腿各关节角度参数,从运动生物力学角度出发,根据散打鞭腿技术动作可分为5个运动环节的结束点和各环节的中段点确定9个取值点。运用其数据解析对腰部二次发力进行特征剖析。研究结果表明:1)鞭腿击打过程中支撑膝关节T3到T3-4大于T3-4到T4,髋关节角度T3到T3-4小于T3-4到T4。2)进攻腿膝和髋关节T3-4小于T3-4到T4,髋轴和肩轴夹角增大。这些现象证明了散打鞭腿动作击打前瞬间,躯干进行了二次扭转,即腰部出现了第二次发力现象。

Three -dimensional analytical system is used to test the parameters of each joint of the supporting and attacking legs from the perspective of biomechanics. According to the ＂whip - leg ＂technique of Sanda, 9 value points are identified based on the end points of the five links and middle points of the whip - leg technique. Data analysis is a- dopted to dissect the second force exertion of the waist. Research results show that ： 1 ） the supporting knee joints T3 to T3 - 4 are bigger than T3 - 4 to T4. The hip angle of T3 to rib is smaller than T3 - 4 to T4 ; 2） The knee and hip joint T3 -4 of the attacking leg is smaller than T3 -4 to T4 while the hip axis and shoulder axis angle increase. These phe- nomena prove that just before the whip the trunk twists for a second time, i.e. the waist witnesses the second exertion of force.