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Comparison of two- and three-dimensional methods for analysis of trunk kinematic variables in the golf swing

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journal contribution
posted on 15.06.2016, 15:35 authored by Aimee MearsAimee Mears, Jonathan RobertsJonathan Roberts, Eric S. Wallace, Pui W. Kong, Steph ForresterSteph Forrester
Two-dimensional methods have been used to compute trunk kinematic variables (flexion/extension, lateral bend, axial rotation) and X-factor (difference in axial rotation between trunk and pelvis) during the golf swing. Recent X-factor studies advocated three-dimensional (3D) analysis due to the errors associated with two-dimensional (2D) methods, but this has not been investigated for all trunk kinematic variables. The purpose of this study was to compare trunk kinematic variables and X-factor calculated by 2D and 3D methods to examine how different approaches influenced their profiles during the swing. Trunk kinematic variables and X-factor were calculated for golfers from vectors projected onto the global laboratory planes and from 3D segment angles. Trunk kinematic variable profiles were similar in shape; however, there were statistically significant differences in trunk flexion (-6.5 ± 3.6°) at top of backswing and trunk right-side lateral bend (8.7 ± 2.9°) at impact. Differences between 2D and 3D X-factor (approximately 16°) could largely be explained by projection errors introduced to the 2D analysis through flexion and lateral bend of the trunk and pelvis segments. The results support the need to use a 3D method for kinematic data calculation to accurately analyze the golf swing.



  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of Applied Biomechanics






23 - 31


SMITH, A.C. ... et al, 2016. Comparison of two- and three-dimensional methods for analysis of trunk kinematic variables in the golf swing. Journal of Applied Biomechanics, 32 (1), pp. 23 - 31.


© Human Kinetics


AM (Accepted Manuscript)

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This is the as accepted for publication version of a paper subsequently published in the Journal of Applied Biomechanics © Human Kinetics. The definitive version is available at: