Construction of racket evaluation index by tennis stroke motion analysis

Abstract

The purpose of this paper is to build a selection index for tennis rackets. By investigating the effect of the racket on its stroke motion, derived motion indices were used to evaluate the tennis racket. During its swing, the feature points of the motion are derived by calculating the contribution of each part of the body in the tennis stroke motion, and the analysis is performed focusing on the feature points. The subjects of the study were three male senior tennis players and two male beginner players. Stroke motion and the three-dimensional information of each part of the human body was recorded with twelve motion capture cameras and six rackets with different characteristics. By using three-dimensional information, characteristic markers of the tennis strokes were derived. The vertical position of the marker was analyzed, and the change in the stroke motion of each racket was examined. Focusing on the swing variation from racket to racket, the sum of standard deviations was used. The analysis was performed by comparing the sum of standard deviation and swing speed. As a result, the relationship between the sum of the standard deviation and the swing speed for the stroke motion was shown.