INTRODUCTION: The topspin forehand in table tennis is an effective offensive shot especially against backspin balls. It would be interesting for coaches and players to compare the kinematics of the stroke between different performance level players and between different ball spins. The purpose of this study was to clarify whether performance level and ball spin affect the kinematics of the table tennis topspin forehand. METHOD: Nine advanced and 8 intermediate male collegiate table tennis players hit topspin forehands against light and heavy backspins. Five high speed video cameras were used to record their strokes at 200 frames per second. Contributions of joint rotations to the racket speed (Sprigings et al.,1994), the racket kinematics at ball impact, the time when the racket acquired the 25% value of the racket speed at impact relative to impact (t0.25) and the maximum slope of the racket speed-time curve (smax) were determined. A two-way repeated measure ANOVA tested the significance of the effects (P < 0.01). RESULTS: The advanced players showed a significantly larger contribution of lower trunk axial rotation to the racket speed at impact (P = 0.009) and had a significantly larger value of smax (P = 0.004) and tended to have a later time of t0.25 (P = 0.034) than the intermediate players (Table 1). The racket speed at impact was not significantly different between the two subject groups (P = 0.111). The players adjusted the racket face angle rather than the inclination of the racket path at impact to the different ball spins.
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