ANALYSIS OF THE GOLF SLOPE SHOT BY GROUND REACTION

Abstract

The purpose of this study was to develop a method for improving performance by weight transfer of slope shots. It is necessary to comprehend the mechanism in order to achieve effective movement of the slope shot. Slope shots have been used by many golfers, who trained those pattern of the golf swing.Weight transfer could be appeared with subjective observation alone in slope shots. It was became obvious that there was a difference among four golfers in the swing movement by compared the weight transfer of the slope shots. METHODS Subjects were a professional golfer (E N) and three amateur skilled golfers Upper-class (M N) middle-class (R E) and beginner-class (H H). All subjects were right handed male golfers and used the seven iron club. Subject stood on top of the plate facing uphill, downhill, uphill and sloping left, and downhill and sloping left. The degree of lie was set twenty degrees.The experiment carried out as follows that was attached to the measurement of body turbulence in (3 seconds) for during a slope shot action. Inputting with sampling frequency 200 Hz, 5 ms with A D converter device furthermore through, strain amplitude, filter from force plate a special program of computer was used that. These slope shots with 60 fps speed, from a front (about 10 M) of a subject by using VTR camera. RESULT AND DISCUSSION As for the ground reaction force on an uphill lie, professional golfer (E N) had much more path way of target foot than that of players of upper-class (M N) middle-class R.E. and beginner-class H.H. The resultant of body weight transfer in the downhill lie were compared among four golfers. Professional golfer (E N) showed loci of weight transfer among the target foot and the center of stance. The center of vertical force by the downhill lie were appeared at the orbit on target foot sole pressure of four subjects. The orbits of transfer foot were found to be two types patterns, orbit transferred at small circle with middle-class player, while the straight line were drew by beginner, and a square area were observed by professional golfer and upper-class player. REFERENCES James Rechords, Matin Farrell, James Kent and Robert Kraft (1985). Weight transfer patterns during the golf swing. Res Quart, 56, 361-365. Kazuaki Kawashima (1987). The biomchanics of golf swing: by weight transfer loci. Japan Journal of golf sciences, Vol. 1, No. 1, 34-40. Kazuaki Kawashima (1988).Changes on movement pattern of practices in golf swing. Proceeding of Japanese Journal of biomechanics, Vol. 9, 52-56.