title: The effects of carrying extra weight on ankle stability in adolescent basketball players.
abstract: OBJECTIVE
  The purpose of this study was to investigate the effects of weight on ankle stability in adolescent basketball players.
  
  
  METHODS
  20 non-injured subjects (age=11.05+/-1.5 years) were included in this study. Each subject performed a 15min warm-up by running or riding a stationary bike. The Star Excursion Balance Test (SEBT), single-leg balance test (performed with eyes open and eyes closed) and vertical jump test were performed with dominant lower extremity. 1 week later, same tests were performed with a schoolbag. The schoolbag contained weight bars as 20% of the players own body weight.
  
  
  RESULTS
  Only posteromedial component of SEBT had significant difference between non-weight measurement and weighted measurement (p=0.004). Single-leg stance test performed with eyes open (p=0.006) and closed (p=0.001) had significant difference between non-weight measurement and weighted measurement. Also the vertical jump test had significant difference between non-weight measurement and weighted measurement (p=0.001).
  
  
  CONCLUSIONS
  These findings indicate that 20% weight of their own body weight does not affect dynamic ankle stability and postural limitations, which are magnified by advancing weight. We are confident in our conclusions because of the three-way interaction noted with posterior/medial with weight in SEBT. Furthermore, Star Excursion Balance test is more effective both weight and non-weight in measuring functional stability of the ankle.
authors.affiliation: Hacettepe University, Faculty of Health Sciences, Department of Physical Therapy and Rehabilitation, 06100 Ankara, Turkey. nihan 2002@hotmail.com
authors.forename: Nihan
authors.initials: N
authors.lastname: Ozunlu
authors.forename: Gul Oznur
authors.initials: GO
authors.lastname: Basari
authors.forename: Gul
authors.initials: G
authors.lastname: Baltaci
mesh_terms: D000293:Adolescent; D000843:Ankle Joint / Q000502:physiology*; D001490:Basketball; D002648:Child; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000175:diagnosis*; D008297:Male; D004856:Postural Balance / Q000502:physiology; D016474:Weight-Bearing / Q000502:physiology*