title: Difference in Functional Performance on the Upper-Quarter Y-Balance Test Between High School Baseball Players and Wrestlers.
abstract: BACKGROUND
  The Upper Quarter Y-Balance Test (YBT-UQ) is a unique movement test where individuals perform at the limits of their stability, requiring the coordination of balance, proprioception, range of motion, and stabilization. It is not yet clear if performance on the YBT-UQ differs between sports with dissimilar emphasis on upper-extremity performance.
  
  
  OBJECTIVE
  To compare performance on the YBT-UQ between wrestlers, whose sport requires some degree of closed-chain activity, and baseball players, whose sport is primarily open kinetic chain in nature.
  
  
  METHODS
  Cross-sectional.
  
  
  METHODS
  High school preparticipation physical assessment.
  
  
  METHODS
  24 healthy high school male wrestlers (mean age 16.12 ± 1.24 y) and 24 healthy high school male baseball players (mean age 15.79 ± 1.25 y).
  
  
  METHODS
  All subjects performed the YBT-UQ, which requires reaching in 3 directions while maintaining a push-up position.
  
  
  METHODS
  The variables of interest include the maximum reach in each direction, as well as the composite score. In addition, asymmetries between limbs for each reach direction were compared.
  
  
  RESULTS
  Wrestlers performed significantly better than baseball players in the medial direction, inferolateral direction, and in composite scores. In the medial direction, wrestlers exhibited greater scores (P < .01) on both left and right limbs, 10.5 ± 10.2%LL and 9.95 ± 10.2%LL, respectively. Significant differences (P < .01) were also observed in the inferolateral direction, with a difference of 11.3 ± 12.0%LL on the left and 8.7 ± 11.0%LL on the right. Composite scores were higher (P < .01) for the wrestlers, with a difference of 7.0% on the left and 7.1% on the right.
  
  
  CONCLUSIONS
  This study suggests that wrestlers perform better on the YBT-UQ than baseball players. The findings may suggest sport-specific normative data for the YBT-UQ in high school athletes.
authors.forename: Heather
authors.initials: H
authors.lastname: Myers
authors.forename: Mary
authors.initials: M
authors.lastname: Poletti
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Butler
mesh_terms: D000293:Adolescent; D056352:Athletes; D001484:Baseball; D003430:Cross-Sectional Studies; D005080:Exercise Test; D006801:Humans; D008297:Male; D004856:Postural Balance; D014952:Wrestling
keywords: asymmetry; closed chain; sport specific; stability