Date of Award

Summer 2009

Document Type


Degree Name

Master of Science in Education (MSEd)


Human Movement Sciences


Athletic Training

Committee Director

James Onate

Committee Member

Bonnie Van Lunen

Committee Member

Brent Arnold

Committee Member

Thomas Kaminski

Call Number for Print

Special Collections LD4331.E44 S69 2009


Injuries to the lateral ankle ligaments can result in ankle instability problems. Limited data exists in relation to isokinetic and isometric strength measures of the ankle, with an absence of data in relation to isotonic power measures. Therefore, the purpose of this study is to identify if there is a difference between subjects with unstable ankles and subjects with stable ankles with respect to isokinetic ankle strength, isometric ankle strength, and isotonic ankle power. Eighteen subjects with ankle instability (age, 23.9 ± 2.81 years; height 170.4 ± 8.9 cm; mass 73 ± 18.9 kg) and eighteen subjects with healthy ankles (age, 22.4 ± 1.04 years; height 170.9 ± 8.4 cm; mass 71 ± 13 kg) participated in the study. Classification of ankle instability was attained through the use of the Cumberland Ankle Instability Tool. Inversion, eversion, plantar flexion, and dorsiflexion motions about the ankle were analyzed, with peak torque values obtained through isometric and concentric-eccentric isokinetic movements, and peak power values collected for isotonic movements. The average of the trials for each direction was standardized to each subject's body mass and utilized for statistical analysis. No significant differences were displayed between groups for isometric ankle strength, isokinetic ankle strength and isotonic ankle power. No strength deficits were identified between unstable and stable ankles; therefore strength is most likely not related to ankle instability.


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