title: Reliability and generality of measures of acceleration, planned agility, and reactive agility.
abstract: OBJECTIVE
  The purpose of the current study was to assess the reliability of a new protocol that examines different components of agility using commercially available timing gates.
  
  
  METHODS
  Seventeen physically active males completed four trials of a new protocol, which consisted of a number of 10-m sprints. Sprints were completed in a straight line or with a change of direction after 5 m. The change of direction was either planned or reactive, with participants reacting to a visual light stimulus.
  
  
  RESULTS
  There was no systematic bias in any of the measures, although random variation was reduced in the straight acceleration and planned agility when considering only the final pair of trials, with mean coefficients of variation (CV) of 1.6% (95% CI, 1.2% to 2.4%) and 1.1% (0.8% to 1.7%), respectively. Reliability of reactive agility remained consistent throughout with mean CVs of approximately 3%. Analyses revealed a high degree of common variance between acceleration times and both planned (r2 = .93) and reactive (r2 = .83) agility, as well as between the two agility protocols (r2 = .87).
  
  
  CONCLUSIONS
  Both planned and reactive agility could be measured reliably. Protocol design and use of a light stimulus in the reactive test emphasize physical abilities comparable with other test measures. Therefore, inclusion of a reactive light stimulus does not appear to require any additional perceptual qualities.
authors: Cardiff School of Sport, University of Wales Institute, Cardiff, Wales, UK.
authors: Jon L
authors: JL
authors: Oliver
authors: Robert W
authors: RW
authors: Meyers
mesh_terms: D000054:Acceleration; D054874:Athletic Performance / Q000502:physiology*; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D009048:Motor Skills / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D011930:Reaction Time; D015203:Reproducibility of Results; D012420:Running / Q000502:physiology*; D013647:Task Performance and Analysis; D055815:Young Adult