The Interaction of Cognitive Interference, Standing Surface, and Fatigue on Lower Extremity Muscle Activity

Hill, Christopher M.; DeBusk, Hunter; Simpson, Jeffrey D.; Miller, Brandon L.; Knight, Adam C.; Garner, John C.; Wade, Chip; Chander, Harish

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자료유형: 학술저널

저자정보: Hill, Christopher M. (Northern Illinois University, Department of Kinesiology and Physical Education) DeBusk, Hunter (Mississippi State University, Department of Industrial and System Engineering) Simpson, Jeffrey D. (University of West Florida, Department of Exercise Science and Community Health) Miller, Brandon L. (Mississippi State University, Department of Kinesiology) Knight, Adam C. (Mississippi State University, Department of Kinesiology) Garner, John C. (Troy University, Department of Kinesiology and Health Promotion) Wade, Chip (Auburn University, Department of Industrial and Systems Engineering) Chander, Harish (Mississippi State University, Department of Kinesiology)

저널정보: 산업안전보건연구원 Safety and health at work : SH@W Safety and health at work : SH@W 제10권 제3호

발행연도: 2019.1

수록면: 321 - 326 (6page)

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Background: Performing cognitive tasks and muscular fatigue have been shown to increase muscle activity of the lower extremity during quiet standing. A common intervention to reduce muscular fatigue is to provide a softer shoe-surface interface. However, little is known regarding how muscle activity is affected by softer shoe-surface interfaces during static standing. The purpose of this study was to assess lower extremity muscular activity during erect standing on three different standing surfaces, before and after an acute workload and during cognitive tasks. Methods: Surface electromyography was collected on ankle dorsiflexors and plantarflexors, and knee flexors and extensors of fifteen male participants. Dependent electromyography variables of mean, peak, root mean square, and cocontraction index were calculated and analyzed with a $2{\times}2{\times}3$ within-subject repeated measures analysis of variance. Results: Pre-workload muscle activity did not differ between surfaces and cognitive task conditions. However, greater muscle activity during post-workload balance assessment was found, specifically during the cognitive task. Cognitive task errors did not differ between surface and workload. Conclusions: The cognitive task after workload increased lower extremity muscular activity compared to quite standing, irrespective of the surface condition, suggesting an increased demand was placed on the postural control system as the result of both fatigue and cognitive task.

#Anti-fatigue #Dual-task #Postural control #Standing surface

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