Effects of stepwise changes in subjective effort on joint kinematics during the table tennis forehand topspin stroke

Main Article Content

Yuki Sato
https://orcid.org/0009-0008-7015-7149
Kengo Wakui
Koichiro Miyazaki
https://orcid.org/0000-0002-8891-6595
Yukihiko Ushiyama

Abstract

In table tennis forehand topspin strokes, players must regulate output according to rally demands; however, how joint kinematics change over time with subjective effort remains unclear. This study examined phase-dependent changes in pelvic, trunk, and upper-limb joint angles and racket orientation when subjective effort was manipulated in a graded manner. Ten skilled male players performed strokes at 60%, 70%, 80%, 90%, and 100% effort, recorded with motion capture. One-way repeated-measures ANOVA tested effects of effort on peak racket-tip speed, inter-event durations, and joint/racket angles at impact; Statistical Parametric Mapping (SPM) evaluated time-series waveforms. Peak racket-tip speed increased stepwise with effort (significant main effect), whereas inter-event durations showed no significant differences. SPM showed frequent effort-dependent differences in shoulder horizontal flexion/extension and pelvic axial rotation, primarily around impact. At impact, significant main effects were observed mainly in the pelvis, trunk, and proximal upper-limb joints, but not in the forearm, wrist, or racket orientation. During follow-through, effort-related differences emerged in thorax lateral flexion, shoulder internal/external rotation, and racket tilt angle. These findings suggest that increased output with higher effort is achieved mainly through proximal kinematic adjustments and late-phase changes while maintaining distal mechanics and racket configuration at impact.

Article Details

How to Cite
Sato, Y., Wakui, K., Miyazaki, K., & Ushiyama, Y. (2026). Effects of stepwise changes in subjective effort on joint kinematics during the table tennis forehand topspin stroke. Scientific Journal of Sport and Performance, 5(3), 447–460. https://doi.org/10.55860/YRCM7402
Section
Performance Analysis of Sport and Physical Conditioning
Author Biographies

Yuki Sato, National Institute of Technology

Department of General Education.

Kengo Wakui, Niigata University

Division of Humanities and Social Sciences.

Yukihiko Ushiyama, Niigata University

Division of Humanities and Social Sciences.

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