Assessment of the variability of vastii myoelectric activity in young healthy females during walking: A statistical gait analysis

Francesco Di Nardo, Elvira Maranesi, Alessandro Mengarelli, Giacomo Ghetti, Laura Burattini, Sandro Fioretti

Research output: Contribution to journalArticlepeer-review

Abstract

The study was designed to assess the natural variability of the activation modalities of vastus medialis (VM) and vastus lateralis (VL) during walking at a self-selected speed and cadence of 30 young, healthy, females. This was achieved by conducting statistical gait analysis on the surface electromyographic signals from hundreds of strides for each subject. Results revealed variability in the number of activations, occurrence frequency, and onset-offset instants across the thousands of strides analyzed. However, despite the variability, there was one activation occurrence which remained consistent across subjects for both VM and VL. This occurred from terminal swing to the following loading response (observed in 100% of strides). A second, less frequent, activation occurred between mid-stance up to pre-swing (observed in 39.3 ± 22.4% of strides for VM and in 35.1 ± 20.6% for VL). No significant differences (p>. 0.05) were observed in the onset-offset instants or in the occurrence frequency, which suggest a simultaneous recruitment of VM and VL. This "normality" pattern represents the first attempt at developing a reference frame for vastii sEMG activity during walking, that is able to include the physiological variability of the phenomenon and control the confounding effects of age and gender.

Original languageEnglish
Pages (from-to)800-807
Number of pages8
JournalJournal of Electromyography and Kinesiology
Volume25
Issue number5
DOIs
Publication statusPublished - Oct 1 2015

Keywords

  • Knee-flexor muscles
  • Quadriceps femoris
  • Statistical gait analysis
  • Surface electromyography
  • Variability

ASJC Scopus subject areas

  • Neuroscience (miscellaneous)
  • Biophysics
  • Clinical Neurology

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