Date of Award

5-1-2005

Document Type

Restricted Access Thesis

Degree Name

Master of Education in Athletic Training

Department

Department of Athletic Training

Committee Member

Julie N. Bernier

Committee Member

Erik E. Swartz

Committee Member

Irene M. Cucina

Abstract

The purpose of this study was to assess time to stabilization (TTS) of braced and unbraced-subjects during single-leg jump landing. Twenty-five healthy subjects(age = 20.4, ± 1.6 yrs; height = 169.9, ± 6.5 cm; weight = 67.8, ± 11.0 kg) performed three successful trials of a single-leg jump landing under both braced and unbraced conditions. The brace was an ASO Ankle Stabilizer (Medical Specialties, Inc., Charlotte, NC). Ground reaction forces (vertical, medial-lateral, and anterior-posterior) were collected during the single-leg jump landings onto a Bertec forceplate FP4060-NC (Bertec Corporation, Columbus, OH). A 2 X 2 (Condition X Direction) factorial ANOVA with repeated measures indicated no significant (F(.05)(l, 24) = 4.26, p= .207) interaction for condition (braced and unbraced) in either of the directions (medial-lateral TTS and anterior-posterior TTS). No significant main effect was found for brace condition (F(.05)(1,24) = 4.26, p = .827), but a significant main effect was found for direction (F(.05)(1,24) = 4.26, p = .000) with medial-lateral TTS faster than the anterior-posterior TTS. A paired t-Test showed no significant (t(.05)(24) = 2.064, p = .829) mean difference in vertical TTS between braced and unbraced conditions. An Intraclass Correlation was used to determine trial reliability. Reliability ranged from ICC = .87 to.96. The findings of this study suggested the application of ankle brace on healthy subjects does not effect TTS during a single-leg jump landing. Further research is necessary in the area of injured subjects and ankle brace use during lateral jump tasks

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