title: Bilateral differences in the upper quarter function of high school aged baseball and softball players.
abstract: OBJECTIVE
  The Upper Quarter Y Balance Test (YBT-UQ) was developed as a way to identify upper extremity and trunk mobility in the open kinetic chain in the reaching limb as well as midrange limitations and asymmetries of upper extremity and core stability in the closed kinetic chain on the stabilizing limb. Performance on the YBT-UQ is similar between genders and between limbs; however, this has not been examined in athletes who participate in sports that result in upper extremity asymmetries. The primary purpose of this study is to determine if differences exist between the throwing vs. non-throwing sides in high-school baseball and softball athletes on the YBT-UQ.
  
  
  METHODS
  In order to complete this forty-eight male high school baseball players and seventeen female high school softball players were tested on the YBT-UQ. Reach distances were normalized to arm length (% AL). Comparisons were made between the throwing (T) and non-throwing (NT) arm for each direction as well as the composite score.
  
  
  RESULTS
  No significant differences were observed between the T and NT arm for the medial (NT: 98.4 ± 8.6 %AL, T: 99.1 ± 8.6 %AL, p=0.42), inferolateral (NT: 90.8 ± 11.8 %AL, T: 90.3 ± 11.5 %AL, p =0.61), superolateral (NT: 70.6 ± 10.9 %AL, T: 70.4 ± 11.1 % AL, p=0.91) reaches, or the composite score (NT: 87.2 ± 8.9 % AL, T: 86.6 ± 8.1 %AL, p=0.72). Similarly, no differences were observed between the male baseball and female softball players (p=0.30-0.90).
  
  
  CONCLUSIONS
  Based on these findings, it was concluded that there was no difference in performance on the YBT-UQ between throwing and non-throwing limbs in high school baseball and softball players.
  
  
  METHODS
  3.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Butler
authors.affiliation: Duke Health Systems Physical Therapy Sports Medicine Division, Durham, NC.
authors.forename: Heather S
authors.initials: HS
authors.lastname: Myers
authors.affiliation: Katterbach US Army Health Clinic, Katterbach, Bavaria, Germany.
authors.forename: Douglass
authors.initials: D
authors.lastname: Black
authors.forename: Kyle B
authors.initials: KB
authors.lastname: Kiesel
authors.forename: Phillip J
authors.initials: PJ
authors.lastname: Plisky
authors.affiliation: Department of Orthopaedics, Division of Sports Medicine, Duke University, Durham, NC.
authors.forename: Claude T
authors.initials: CT
authors.lastname: Moorman
authors.affiliation: Department of Orthopaedics, Michael W. Krzyzewski Human Performance Research Laboratory, Duke University, Durham, NC.
authors.forename: Robin M
authors.initials: RM
authors.lastname: Queen
keywords: Functional testing; movement; screening; stabilization