Research article - (2018)17, 330 - 338
Correlations between Angular Velocities in Selected Joints and Velocity of Table Tennis Racket during Topspin Forehand and Backhand
Ziemowit Bańkosz1,, Sławomir Winiarski2
1Department of Sport Didactics, Faculty of Sport Sciences University School of Physical Education in Wrocław, Wrocław, Poland
2Department of Biomechanics, Faculty of Physical Education, University School of Physical Education in Wrocław, Wrocław, Poland

Ziemowit Bańkosz
✉ University School of Physical Education in Wrocław al. Paderewskiego 35, 51-612 Wrocław, Poland
Email: ziemowit.bankosz@awf.wroc.pl
Received: 10-01-2018 -- Accepted: 16-04-2018
Published (online): 14-05-2018
ABSTRACT

The aim of this study was to determine the correlations between angular velocities in individual joints and racket velocity for different topspin forehand and backhand strokes in table tennis. Ten elite female table tennis players participated, presenting different kinds of topspin forehands and backhands – after a no-spin ball (FH1, BH1), after a backspin ball (FH2, BH2) and “heavy” topspin (FH3, BH3). Range of motion was measured with the BTS Smart-E (BTS Bioengineering, Milan, Italy) motion analysis system with a specially developed marker placement protocol for the upper body parts and an acoustic sensor attached to the racket to identify ball-racket contact. In forehand strokes angular velocities of internal arm rotation and adduction in shoulder joint correlated with racket velocity. Racket velocity was correlated with angular velocities (hip extension on the playing side; hip flexion on the opposite side; ankle flexion) in the case of a topspin forehand performed with maximal force –”heavy” topspin (FH3). In backhand strokes the velocities of arm abduction and shoulder girdle rotation towards the playing side correlated with racket velocity. The angular velocity of internal arm rotation and adduction in shoulder joint may be important components of a coordinated stroke, whilst angular velocity can substantially affect the racket speed when one is changing the type of stroke.
Key words: 3D motion analysis, biomechanics, sport, table tennis, topspin

Key Points
  • The aim of this study was to calculate correlations between racket velocity and the angular velocities of individual joints and for variants of topspin forehand and backhand strokes in table tennis.
  • A novel model was used to estimate range of motion (specially developed placement protocol for upper body markers and identification of a ball-racket contact using an acoustic sensor attached to the racket).
  • In forehand strokes angular velocities of internal arm rotation and adduction in shoulder joint were correlated with racket velocity.
  • Correlations between racket velocity and the angular velocities of playing- and non-playing-side hip extension and ankle flexion were found in topspin forehands.
  • In topspin backhands abduction of the arm had the greatest impact on the racket speed.
  • The results can be used directly to improve training of table tennis techniques, especially topspin strokes.








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Correlations between Angular Velocities in Selected Joints and Velocity of Table Tennis Racket during Topspin Forehand and Backhand
Ziemowit Bańkosz, Sławomir Winiarski
2018(17), 330 - 338.
DOI: https://doi.org/