title: The association between changes in speed skating technique and changes in skating velocity.
abstract: A meaningful association between changes (Δ) in push-off angle or effectiveness (e) and changes in skating velocity (v) has been found during 5000-m races, although no significant association was found between changes in knee (θ0) and trunk angle (θ1) and Δv. It might be that speed skating event, sex, and performance level influence these associations.
  
  
  OBJECTIVE
  To study the effect of skating event, sex, and performance level on the association between Δe and Δv and between Δθ0 and Δθ1 and Δv.
  
  
  METHODS
  Video recordings were made from frontal (e) and sagittal views (θ0 and θ1) during 1500- and 5000-m men's and women's World Cup races. Radio-frequency identification tags provided data of v.
  
  
  RESULTS
  Skating event influenced the association between Δe and Δv, which resulted in a significant association between Δe and Δv for the 5000-m (β = -0.069, 95% confidence interval [-0.11, -0.030]) but not for the 1500-m (β = -0.011 [-0.032, 0.010]). The association between Δθ0 and Δθ1 and Δv was not significantly influenced by skating event. Sex and performance level did not substantially affect the association between Δe and Δv and between Δθ0 and Δθ1 and Δv.
  
  
  CONCLUSIONS
  Skating event significantly influenced the association between Δe and Δv; a 1° change in e results in a 0.011-m/s decrease in v during the 1500-m and a 0.069-m/s decrease in v during the 5000-m. Thus, it seems especially important to maintain a small e during the 5000-m.
authors: MOVE Research Inst, VU University Amsterdam, Amsterdam, The Netherlands.
authors: Dionne A
authors: DA
authors: Noordhof
authors: Carl
authors: C
authors: Foster
authors: J M
authors: JM
authors: Hoozemans M
authors: Jos J
authors: JJ
authors: de Koning
mesh_terms: D000054:Acceleration; D054874:Athletic Performance / Q000502:physiology*; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D008297:Male; D012044:Regression Analysis; D012737:Sex Factors; D012861:Skating / Q000502:physiology*; D014741:Video Recording