Date of Award

Spring 2009

Document Type

Thesis

Degree Name

Master of Science in Education (MSEd)

Department

Human Movement Sciences

Program/Concentration

Athletic Training

Committee Director

James Onate

Committee Member

Bonnie Van Lunen

Committee Member

Stacie Ringleb

Call Number for Print

Special Collections LD4331.E44 P45 2009

Abstract

The musculature of the lower extremity provides dynamic stability during daily and athletic tasks. In landing tasks, the lower extremity absorbs forces and reduces excessive stresses and motions that are placed upon the body. Neuromuscular fatigue has been linked to an increase in injury and altered kinematics during jump landing tasks. The purpose of this study was to analyze the effects of hamstring fatigue on knee and hip kinematics pre and post hamstrings fatigue while landing from a box drop of 30cm height, during the stop-jump phase. The study aimed to quantify the kinematic data of the hip and knee in order to examine the lower extremity motion pattern variations following hamstring fatigue. Fourteen healthy female recreational athletes (age=21.4±1.45 yrs; height=165.14±8.26 cm; mass=65.56±16.43 kg) with no history of surgery, no ACL injury or current injury involving their lower extremity were subjects in the current study. Eccentric hamstring fatigue, a 30% eccentric isokinetic knee-flexor torque reduction, was induced on the dominant leg using Primus RS (BTE Technologies Inc). Kinematic data were processed using VICON Motion system during the box drop task both pre and post fatigue. Hip and knee kinematics were measured pre and post fatigue for maximum values, and at time instances of initial contact and maximum knee flexion values during the stop-jump phase of the bilateral box drop. Statistic tests included a univariate analysis of variance with repeated measures to analyze the hip and knee kinematics. A significant level of < .05 was set a priori for all analyses. Upon initial contact of the stance phase, hip flexion significantly increased post-fatigue (43.78±8.21, CI=39.03;48.52) than pre-fatigue (40.68±6.82, CI=36.71;44.62). No other significant difference was found at either the hip or knee for maximum values or at initial or maximum knee flexion. Our findings revealed fatigue of the hamstrings caused a disruption in hip kinematics at initial contact. Although fatigue adversely affects the muscular function, altered kinematics of the lower extremity during tasks may be highly dependent upon the fatigue task chosen. Subjects may have placed greater reliance on unfatigued musculature in the lower extremity to accomplish the box drop task.

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DOI

10.25777/1x4v-0b47

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