운동역학 : 골프 스윙에 있어서 기술수준이 운동학적 요인의 일관성에 미치는 영향

The purpose of this study was to investigate the effects of intrasubject repeatability on the kinematic variables during different skill levels of golf swing. 33 subjects (skilled: 19, unskilled: 14) performed each 10 swings with using a iron (number 7) and a driver. FastTrak electromagnetic tracking system (Polheus Inc., Colchester, VT) was used to collect the kinematic data in real time. We analyzed the time to backswing and downswing, wrist release point, head lift to backswing and downswing, hip sway to backswing and downswing, hip and shoulder rotational angle, x-factor, and hip and shoulder rotational velocity during impact. The statistical analysis was used with Internal Consistency Reliability and two-way mixed ANOVA to get Internal Consistency Constant(ICC). The unskilled subjects showed less consistency in the time to backswing and wrist release point. Specially, the low consistency was found for the wrist release point with using a driver while the unskilled subjects performed. The consistency of the wrist release point is the most important problem to improve golf skill for unskilled subjects. The hip sway showed relatively less consistency while the unskilled subjects performed. In order to increase the consistency of the hip sway, resistance training was necessary to improve stability of the lower extremity. The swing consistency is less related with the range of motion and the rotational velocity of joint. It is more related with time variable such as the timing of movement.