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J Sports Sci. 2018 Oct;36(19):2164-2171. doi: 10.1080/02640414.2018.1442287. Epub 2018 Feb 23.

The role of pelvis-thorax coupling in controlling within-golf club swing speed.

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a School of Physical Education, Sport and Exercise Sciences , University of Otago , Dunedin , New Zealand.
b Department of Training Science and Sport Informatics, Faculty of Sports and Health Science , Technische Universität München , Munich , Germany.
c Department of Human Health Sciences, Graduate School of Medicine , Kyoto University , Kyoto , Japan.
d Department of Bioengineering , Institute for Fiber Engineering, Shinshu University , Ueda , Japan.


Pelvis-thorax coordination has been recognised to be associated with swing speed. Increasing angular separation between the pelvis and thorax has been thought to initiate the stretch shortening cycle and lead to increased clubhead speed. The purpose of this study was to determine whether pelvis-thorax coupling played a significant role in regulating clubhead speed, in a group of low-handicap golfers (mean handicap = 4.1). Sixteen participants played shots to target distances determined based on their typical 5- and 6-iron shot distances. Half the difference between median 5- and 6-iron distance for each participant was used to create three swing effort conditions: "minus", "norm", and "plus". Ten shots were played under each swing effort condition using both the 5-iron and 6-iron, resulting in six shot categories and 60 shots per participant. No significant differences were found for X-factor for club or swing effort. X-factor stretch showed significant differences for club and swing effort. Continuous relative phase (CRP) results mainly showed evidence of the stretch shortening cycle in the downswing and that it was more pronounced late in the downswing as swing effort increased. Substantial inter-individual CRP variability demonstrated the need for individual analyses when investigating coordination in the golf swing.


X-factor; continuous relative phase; coordination; sports biomechanics; statistical parametric mapping

[Indexed for MEDLINE]

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