Safety and Health at Work

Occupational Safety and Health Research Institute, Korea Occupational Safety and Health Agency (산업안전보건연구원)
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The Interaction of Cognitive Interference, Standing Surface, and Fatigue on Lower Extremity Muscle Activity

  • 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)
  • Received : 2018.08.14
  • Accepted : 2019.06.07
  • Published : 2019.09.30
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Abstract

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.

Keywords

References

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