Background & Study Aim: The punch is a key component of boxing. In scientific papers there are informations about kinematic indicators and impact forces. It mentioned that lower extremity have a strong effect on impact force, through transferring momentum into the kinetic chain system. However, the differences of impact forces in different boxing posture have not been fully investigated. The aim of the study was the effects of impact forces and some kinematic indicators in boxing both orthodox and southpaw stance of straight punch technique. Materials & Methods: Nine light middleweight elite boxing athletes from the Turkish National Team (mean and SD): age 19.33 ±2.11yrs; height 174.22 ± 3.79cm; weight 66.0 ±6.62 kg. All participants had experiences both national and international tournament. The techniques were recorded at a frequency of 120 Hz using eight synchronized high-speed cameras (Oqus 7+). The cameras were placed, approximately at right- angles to one another. The three-dimensional data were analyzed using by Qualisys Track Manager (Qualysis, Sweden). This system provides clean and accurate 3D data. A carbon fibre L-frame and a wand calibration stick (600 mm) were used to calibrate the 3D performance area. Results: There was a statistically significant difference only in the trunk angle on the sagittal plane (YZ) (p = 0.015) and no any statistically differences in other angular indicators. There was a statistically difference in sandbag acceleration between southpaw and orthodox stances (p = 0.05). Also, it was found that significant differences in punch velocity (p = 0.038) and punch acceleration (p = 0.021). Additionally, significant differences were found in impact force values and impulse values according to the stance positions (p = 0.05). Conclusions: The boxing athletes achieved more impact forces and accelerations in orthodox stance. It is recommended that to use an orthodox stance instead of southpaw stance in straight punch technique especially for creating more impact forces.
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