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Segmenting Mechanomyography Measures of Muscle Activity Phases Using Inertial Data

Authors
  • Woodward, Richard B.1
  • Stokes, Maria J.2
  • Shefelbine, Sandra J.3, 4
  • Vaidyanathan, Ravi1
  • 1 Imperial College London, Department of Mechanical Engineering, London, UK , London (United Kingdom)
  • 2 University of Southampton, Faculty of Health Science, Southampton, UK , Southampton (United Kingdom)
  • 3 Northeastern University, Department of Mechanical and Industrial Engineering, Boston, MA, USA , Boston (United States)
  • 4 Northeastern University, Department of Bioengineering, Boston, MA, USA , Boston (United States)
Type
Published Article
Journal
Scientific Reports
Publisher
Springer Nature
Publication Date
Apr 03, 2019
Volume
9
Issue
1
Identifiers
DOI: 10.1038/s41598-019-41860-4
Source
Springer Nature
License
Green

Abstract

Electromyography (EMG) is the standard technology for monitoring muscle activity in laboratory environments, either using surface electrodes or fine wire electrodes inserted into the muscle. Due to limitations such as cost, complexity, and technical factors, including skin impedance with surface EMG and the invasive nature of fine wire electrodes, EMG is impractical for use outside of a laboratory environment. Mechanomyography (MMG) is an alternative to EMG, which shows promise in pervasive applications. The present study used an exerting squat-based task to induce muscle fatigue. MMG and EMG amplitude and frequency were compared before, during, and after the squatting task. Combining MMG with inertial measurement unit (IMU) data enabled segmentation of muscle activity at specific points: entering, holding, and exiting the squat. Results show MMG measures of muscle activity were similar to EMG in timing, duration, and magnitude during the fatigue task. The size, cost, unobtrusive nature, and usability of the MMG/IMU technology used, paired with the similar results compared to EMG, suggest that such a system could be suitable in uncontrolled natural environments such as within the home.

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