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Title: Comparison of two- and three-dimensional methods for analysis of trunk kinematic variables in the golf swing
Authors: Smith, Aimée C.
Roberts, Jonathan R.
Wallace, Eric S.
Kong, Veni Pui Wah
Forrester, Stephanie E.
Keywords: Golf
Trunk kinematic variables
Issue Date: 2016
Citation: Smith, A. C., Roberts, J. R., Wallace, E. S., Kong, P., & Forrester, S. E. (2016). Comparison of two-and three-dimensional methods for analysis of trunk kinematic variables in the golf swing. Journal of Applied Biomechanics, 32(1), 23-31.
Abstract: 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 ± 3.6º) at top of backswing and trunk right-side lateral bend (8.7 ± 2.9º) at impact. Differences between 2D and 3D X-factor (approximately 16º) 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 in order to accurately analyse the golf swing.
Description: This is the final draft, after peer-review, of a manuscript published in Journal of Applied Biomechanics. The published version is available online at
ISSN: 1065-8483 (print)
1543-2688 (online)
Other Identifiers: 10.1123/jab.2015-0032
Appears in Collections:Journal Articles

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