Effect of leg muscle fatigue on the contributions of the somatosensory, visual, and vestibular systems to balance Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/r494vp484

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  • Objectives: To evaluate the effect of leg muscle fatigue on balance and to determine the contributions of the somatosensory, visual, and vestibular systems to balance of apparently healthy males and females. Design: Forty-two subjects were randomly assigned to either the experimental or control groups and then subdivided based on gender resulting in four groups (10 men/women in the experimental groups and 11 men/women in the control groups). Each subject was pre-tested on the Sensory Organization Test assessment of balance. Subjects in the experimental group then underwent a Wingate Anaerobic Test to induce leg fatigue. Following the Wingate Test subjects were post-tested on the Sensory Organization Test. Subjects in the control group rested quietly for a period of seven minutes prior to post-testing. Subjects: Forty-two volunteers without recent or chronic history of lower extremity injury, neurological deficits, or balance problems participated. Main outcome measures: Ratios for the use of the somatosensory, visual, and vestibular systems and the Composite Score were calculated. A [2(Group) x 2(Gender) x 2(Test)] mixed design ANOVA was used to analyze each of the dependent variables. Results: Analysis of Composite Score demonstrated a significant Group x Test interaction (p<0.010). The breakdown of the interaction showed no significant Test effect (p-value 0.341) for the experimental group. However, there was a significant Test effect (p-value<0.010) for the control group. There were no significant effects of fatigue on somatosensory system ratio. The analysis of the visual system ratio revealed a significant main effect (p-value 0.022) for Group. Analysis of vestibular system ratio revealed a significant main effect for Test (p<0.010). Conclusions: As demonstrated by the results of the present experiment, leg muscular fatigue is associated with significantly decreased balance. In addition, fatigue does appear to have an effect on the utilization of visual and vestibular systems.
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