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유문석,이경일 한국운동역학회 2016 한국운동역학회지 Vol.26 No.1
Objective: This study aimed to compare differences in biomechanical factors according to distance changes in relation to approaches during a round of golf to obtain basic data on golf swings. Methods: The research subjects were 8 KPGA-affiliated professional golfers who performed approach shots that put a ball into a circle of 8 feet in diameter from distances of 30, 50, and 70 m. Data were collected by using six infrared cameras and a ground reaction force device, which were applied to calculate biomechanical factors by using Kwon3D XP. The calculated data were subjected to one-way ANOVA by using SPSS 20.0, with the significance level set at p value of 0.05. Results: Elapsed time, stance width, clubhead position variation, clubhead synthesis speed, and cocking angle significantly differed according to distance change during the approach swing. Clubhead speed was positively related with stance width and clubhead displacement. Ground reaction force significantly differed according to distance change during the approach swing. Factors before and after showed differences in other states, except in the impact state. Conclusion: In the present study, we drew several conclusions regarding biomechanical factors and ground reaction forces according to distance change in the approach swing of professional golfers. According to these conclusions, we suggest that distance control with swing range is more important than power control in maintaining the accuracy and consistency of golf swing and is the most important mechanism of golf swing.
골프 어프로치 스윙 시 거리변화와 성공,실패에 따른 EMG 차이 분석
이경일 ( Kyung Ill Lee ),유문석 ( Moon Seok You ),홍완기 ( Wan Ki Hong ) 한국운동역학회 2015 한국운동역학회지 Vol.25 No.1
Objectives : The purpose of this study was to compare differences in muscle activities according to distance changes, and success or failure in relationto approaches during a round of golf in order to obtain basic data on golf swings· Methods : To achieve our research goal, we asked eight professional golfers playing for the Korea Professional Golfers` Association (height: 1·76 ±0·05 m, weight: 73·87 ± 9·21 kg, career duration: 12·87 ± 4·48 yr) to perform approach swings at distances of 30, 50, and 70 m· Results : No differences were observed in the muscle activity of the extensor carpi radialis that were caused by the distance changes· In addition, wefound that the wrist extensors seemed unaffected by the increase in approach distance· Also, we found that the powers of the approach shots were drivenby efficient movements rather than by the strength of the arms· We confirmed that when the distance of the approach increased, the golfers shouldperform their back-swing tops and follow-through right from the right to the left pelvic limb· To achieve successful approach swings despite distancechanges, golfers should first work on the activity of the erector spinae to prepare for rotatory power in the P1 section· Moreover, golfers should increasethe activity of the erector spinae on the left when they need to deal with the distance improvements in the P2 and P3 sections· Conclusion : In the light of the discussion above, we may infer that despite approach distance changes during a round of golf, ideal swings can berealized by consistent activities of the wrist extensor muscles and improved performances of the pelvic limb muscles· Furthermore, this study suggeststhat golfers should improve the consistency of muscle activities in all the other body parts to achieve the ideal swing·