title: The effect of trunk stability training on vertical takeoff velocity.
abstract: METHODS
  Randomized controlled trial with repeated measures.
  
  
  OBJECTIVE
  To determine the effect of trunk stability training on vertical takeoff velocity.
  
  
  BACKGROUND
  Trunk stability training is commonly used in sports training programs; however, the effects of stability training on performance enhancement are not known. Trunk stability training may provide a more stable pelvis and spine from which the leg muscles can generate action, may better link the upper body to the lower body, or may enhance leg muscle activation, thus promoting optimal force production during sporting activities such as a vertical jump.
  
  
  METHODS
  Fifty-five athletes were randomly assigned to 1 of 4 training groups: trunk stability (TS), leg strength (LS), trunk stability and leg strength (TL), and control (CO). Subjects were tested 3 times: at pretraining, after 3 weeks of training, and after 9 weeks of training. A repeated-measures analysis of covariance (ANCOVA) was used to examine differences among groups for vertical takeoff velocity measured indirectly using a force plate. Pretraining takeoff velocity and body mass were used as covariates.
  
  
  RESULTS
  After 3 and 9 weeks, the training groups were not different from each other. After 9 weeks of training, all 3 training groups had a greater takeoff velocity than the control group (P<.05). After 3 weeks of training only the TS group had a greater takeoff velocity than the control group (P<.05). Only the TL group increased significantly in vertical takeoff velocity between the third- and ninth-week testing periods (P<.05).
  
  
  CONCLUSIONS
  Nine weeks of trunk stability training was similarly effective in enhancing vertical takeoff velocity as leg strength training or the combination of trunk stability and leg strength training.
authors.affiliation: School of Physical Therapy, University of Saskatchewan, Saskatoon, SK, Canada.
authors.forename: Scott J
authors.initials: SJ
authors.lastname: Butcher
authors.forename: Bruce R
authors.initials: BR
authors.lastname: Craven
authors.forename: Philip D
authors.initials: PD
authors.lastname: Chilibeck
authors.forename: Kevin S
authors.initials: KS
authors.lastname: Spink
authors.forename: Stacy Lovo
authors.initials: SL
authors.lastname: Grona
authors.forename: Eric J
authors.initials: EJ
authors.lastname: Sprigings
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007866:Leg / Q000502:physiology; D008297:Male; D009068:Movement / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D010806:Physical Education and Training / Q000379:methods*; D016059:Range of Motion, Articular / Q000502:physiology; D013177:Sports / Q000502:physiology*; D013909:Thorax / Q000502:physiology*