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The Relationship between Postural Stability and Lower-Limb Muscle Activity Using an Entropy-Based Similarity Index.

Chien-Chih Wang1, Bernard C Jiang2, Pei-Min Huang3

  • 1Department of Industrial Engineering and Management, Ming Chi University of Technology, New Taipei City 243, Taiwan.

Entropy (Basel, Switzerland)
|December 3, 2020
PubMed
Summary
This summary is machine-generated.

Centre of pressure (COP) measurements can indicate lower limb muscle activity and postural stability, potentially replacing electromyography (EMG) for cost-effective analysis.

Keywords:
empirical mode decompositionexperiment of designsignal analysissimilarity indicessynchronization analysis

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Area of Science:

  • Biomechanics
  • Human Movement Analysis
  • Neuroscience

Background:

  • Postural stability is crucial for daily activities.
  • Electromyography (EMG) measures muscle activity but can be costly and complex.
  • Centre of pressure (COP) measures body sway and may correlate with muscle activity.

Purpose of the Study:

  • To determine if COP measurements can represent EMG data for lower limb muscles.
  • To explore the cost-effectiveness of using COP to assess postural stability and muscle activity.

Main Methods:

  • Utilized Hilbert-Huang Transform for data analysis.
  • Collected simultaneous COP and EMG data from 24 university students across eight scenarios.
  • Employed Empirical Mode Decomposition (EMD) to identify intrinsic mode functions (IMFs).
  • Applied similarity indices and synchronization analyses to correlate muscle strength and postural stability.

Main Results:

  • IMF5 (COP) and IMF6 (EMG) showed no significant difference, with an average frequency of 0.8 Hz (0-2 Hz range).
  • High synchronization (0.010-0.015) observed between COP and EMG during poor postural stability.
  • Low synchronization (0.006-0.080) observed between COP and EMG during good postural stability.
  • COP signals highly correlated with low-frequency EMG signals.

Conclusions:

  • COP measurements provide sufficient information on postural stability.
  • COP data can potentially replace EMG for assessing lower limb muscle activity and postural stability.
  • This offers a more cost-effective approach to monitoring biomechanical performance.