![]() The explosive strength of kicking limb hip flexors and extensors is the main condition constraint for kicking performance. When adding the other 3 components of eccentric and concentric hip internal and external rotations at 30°∙s -1, the internal and external hip rotation ratios at 30°∙s -1 on the stance limb and the concentric ratio of kicking limb flexion and extension at 300°∙s -1 that explained the variance of impact force were 75% (p = 0.003). Multiple regression showed that a separate component of the peak moment concentric hip flexion and extension of the kicking lower limb at 90°∙s -1 can explain 54% of the peak kicking impact force variance (R 2 = 0.54 p < 0.001). The 3D kinematics and isokinetic dynamometry were used to estimate the kick velocity, isokinetic moment of kicking lower limb hip flexors and extensors (60, 120, 240, 300°∙s -1), and stance lower limb hip internal and external rotators (30, 90°∙s -1). Twenty-five male soldiers (27.7 ± 7.2 yrs, 83.8 ± 6.1 kg, 180.5 ± 6.5 cm) performed six barefoot front kicks, where impact forces (N) and kick velocity (m∙s -1) were measured. Therefore, we aimed to determine the regression model between kicking performance and the isokinetic peak net moment of hip rotators, flexors, and hip extensors and flexors at various speeds of contraction. Achieving the maximum possible impact force of the front kick can be related to the isokinetic lower limb muscle strength.
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