title: High-speed video analysis of head-first and feet-first sliding techniques in collegiate baseball players.
abstract: OBJECTIVE
  To determine the method of sliding that propels the baseball athlete to the desired base in the shortest amount of time. To assess the athlete's perception of the quickest, safest, and preferred sliding technique.
  
  
  METHODS
  A single occasion with repeated measures design was used. The independent variable was slide type, and the dependent variable was time.
  
  
  METHODS
  The study was conducted in October 2000 at the University of Kentucky baseball complex.
  
  
  METHODS
  Twenty collegiate baseball players.
  
  
  METHODS
  High-speed video (to 1/200th of second) analysis of 20 collegiate baseball players performing 3 trials each of both head-first and feet-first sliding techniques. Additionally, each participant was asked to complete a sliding survey.
  
  
  METHODS
  The videotape of each slide performed was reviewed separately (using the same viewing equipment) by 2 of the study investigators. Slide type and time were recorded for each slide.
  
  
  RESULTS
  There was no significant difference between head-first versus feet-first slide times (P = 0.357). The average time for feet-first slides was 3.67 seconds, while that for head-first was 3.65 seconds. Sixty-eight percent of the players felt that head-first slides were faster than feet-first slides. Seventy-four percent identified the feet-first slide as the technique they most used, while 90% of the athletes perceived the feet-first technique to be safer.
  
  
  CONCLUSIONS
  On average, head-first and feet-first sliding techniques employed at the end aspect of base running propel the baseball player to the base in similar times. The head-first sliding technique is perceived to be faster and more dangerous.
authors.affiliation: Department of Family Medicine/Sports Medicine, University of Kentucky, Lexington, KY 40536, U.S.A. rhosey@email.uky.edu
authors.forename: Robert G
authors.initials: RG
authors.lastname: Hosey
authors.forename: Carl G
authors.initials: CG
authors.lastname: Mattacola
authors.forename: Robert
authors.initials: R
authors.lastname: Shapiro
mesh_terms: D000328:Adult; D001484:Baseball / Q000502:physiology*; D015331:Cohort Studies; D005528:Foot; D006257:Head; D006801:Humans; D008297:Male; D009038:Motion; D009141:Musculoskeletal System; D011187:Posture; D011930:Reaction Time; D012680:Sensitivity and Specificity; D014741:Video Recording