Validity of the X-factor computation methods and relationship between the X-factor parameters and clubhead velocity in skilled golfers

Young Hoo Kwon, Ki Hoon Han, Christopher Como, Sangwoo Lee, Kunal Singhal

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The purpose of this study was to assess the validity of the X-factor computation methods and to examine whether direct relationships exist between the X-factor parameters and the clubhead velocity in a group of skilled male golfers (n = 18, handicap = - 0.6 ± 2.1). Five driver trials were captured from each golfer using an optical motion capture system (250 Hz). Two plane-based methods (conventional vs. functional swing plane-based) and one Cardan rotation-based method (relative orientation) were used to compute select X-factor (end of pelvis rotation, top of backswing, ball impact (BI), and maximum), X-factor stretch (stretch and maximum stretch), and X-factor velocity (BI and maximum) parameters. The maximum clubhead velocity was extracted and normalized to golfer's body height to eliminate the effect of body size. A one-way repeated MANOVA revealed that the computation methods generated significantly different X-factor parameter values (p < 0.001). The conventional method provided substantially larger X-factor values than the other methods in the untwisting phase and the meaningfulness of select X-factor parameters generated by this method was deemed questionable. The correlation analysis revealed that the X-factor parameters were not directly related to the maximum clubhead velocity (both unnormalized and normalized).

Original languageEnglish (US)
Pages (from-to)231-246
Number of pages16
JournalSports Biomechanics
Volume12
Issue number3
DOIs
StatePublished - Sep 1 2013
Externally publishedYes

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hexachlorocyclohexane x-factor
Body Height
Body Size
Pelvis

All Science Journal Classification (ASJC) codes

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Validity of the X-factor computation methods and relationship between the X-factor parameters and clubhead velocity in skilled golfers. / Kwon, Young Hoo; Han, Ki Hoon; Como, Christopher; Lee, Sangwoo; Singhal, Kunal.

In: Sports Biomechanics, Vol. 12, No. 3, 01.09.2013, p. 231-246.

Research output: Contribution to journalArticle

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