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Автор Elliott, Bruce
Автор Marsh, Tony
Дата выпуска 1989
dc.description AbstractThree‐dimensional (3‐D) high‐speed cinematographic techniques were used to record topspin and backspin forehand approach shots hit down‐the‐line by high‐performance players. The direct linear transformation (DLT) technique was used in the 3‐D space reconstruction from 2‐D images recorded via laterally placed phase‐locked cameras operating at 200 Hz. A Mann‐Whitney U‐test was calculated for the different aspects of the topspin and backspin shots to test for significance (P<0.05).A significant difference was recorded between topspin and backspin shots in the angle of the racket at the completion of the backswing. The racket was taken 0.48 rad past a line drawn perpendicular to the back fence for topspin trials, but only rotated 0.86 rad from a line parallel to the net in the backspin shot. Maximum racket velocities occurred prior to impact and were significantly higher in topspin (26.5 m s‐<sup>1</sup>) compared to backspin (16.6 m s<sup>‐1</sup>) trials. This resulted in the topspin trials recording a significantly higher ball velocity compared to backspin trials (27.6 m s<sup>‐1</sup> vs 21.7 m s<sup>‐1</sup>). Pre‐impact racket trajectories revealed that in topspin shots the racket moved on an upward path of 0.48 rad while in backspin shots it moved down at an angle of 0.34 rad. In the topspin trials impact occurred significantly further forward of the front foot than in backspin shots (0.26 m vs 0.05 m) while the angle of the racket was the same for both strokes (0.14 rad behind a line parallel to the net). The mean angle of the racket‐face at impact was inclined backwards by 0.11 rad for backspin strokes and rotated forward by 0.13 rad for topspin strokes. Angles of incidence and reflection of the impact between the ball and the court showed that backspin trials had larger angles of incidence and reflection than topspin strokes.
Формат application.pdf
Издатель Taylor & Francis Group
Копирайт Copyright Taylor and Francis Group, LLC
Тема Biomechanics
Тема tennis
Тема approach shot
Название A biomechanical comparison of the topspin and backspin forehand approach shots in tennis
Тип research-article
DOI 10.1080/02640418908729842
Electronic ISSN 1466-447X
Print ISSN 0264-0414
Журнал Journal of Sports Sciences
Том 7
Первая страница 215
Последняя страница 227
Аффилиация Elliott, Bruce; Department of Human Movement and Recreation Studies, University of Western Australia
Аффилиация Marsh, Tony; Department of Human Movement and Recreation Studies, University of Western Australia
Выпуск 3
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