USE OF '2D-DLT' FOR THE ANALYSIS OF LONGSWINGS ON HIGH BAR

  • G. Irwin
  • D. Kerwin
Keywords: 2D-DLT, video, gymnastics, longswing, high bar

Abstract

The purpose of this study was to establish how closely a 2D DLT analysis compared with a normal 3D analysis during a longswing on the high bar. Repeated digitisations from two orthogonal camera views were averaged to produce 3D criterion data. Comparisons between 2D reconstructions from the left, right and from an additional perpendicular (2DP) camera view were made. Root mean squared differences (RMSD) for hip and shoulder angles (θH, θS) and angular velocities (ωH, ωS) were determined. Max RMSD was found to be θS= 0.06 rad viewed from the left camera and ωS = 0.60 rad.s-1 from 2DP view. It is therefore recommended that 2D DLT can be used to analyse this skill and that added accuracy can be obtained using left or right camera views during ascending and descending phases respectively. This has direct implications for future research of this type of skill.