1999 年 12 巻 p. 95-104
The purpose of this study was to clear the cause of unforced errors of two-handed backhand stroke in woman's tennis top player. In order to study causes of unforced errors an interview and movement analysis of two-handed ground strokes carried out.
Subject was all japan tennis women's champion in 1994, 1997.
Results of interview, the points of importance for training of two-Handed backhand stroke were shake of racket,timing of movement of the center of gravity, rotation of trunk and utilization of surface reaction force. Causes of unforced errors, were the same points with the points of importance fort raining.
A view-point of analysis of movement was foot work and swing of racket. Cause of unforced errors were obtained.
1)Unforced errors was a fast the start of forward swing and impact point for swing speed of racket.
2)Unforced errors was a high ratio to horizontal level than the upward on swing line of racket.
3)Unforced errors was a short time to foot of step from an axis of foot.