Electromyographic latency of postural evoked responses from the leg muscles during EquiTest Computerised Dynamic Posturography: Reference data on healthy subjects

Laura Perucca, Antonio Caronni, Gaj Vidmar, Luigi Tesio

Research output: Contribution to journalArticlepeer-review

Abstract

No normative data are available for the latencies of the EMG signals from the ankle muscles in response to sudden sagittal tilt (toes-UP or toes-DOWN) or shift (shift-FOR or shift-BACK) of the support surface during standing. In this study the postural evoked response (PER) paradigm on the EquiTest™ force platform was applied to 31 healthy adults (18 women and 13 men; mean age 29. years). The EMG latencies (PEREMG) were computed both through the standard manual procedure and through a specially designed automated algorithm. The manually computed PEREMG onset yielded a 95% tolerance interval between 82 ms and 148 ms after toes-UP perturbation, between 93 ms and 182 ms after toes-DOWN perturbation, between 67 ms and 107 ms after shift-BACK perturbation, and between 73 ms and 113 ms after shift-FOR perturbation. When comparing the two methods, paired t-tests showed no significant mean difference (Bonferroni-adjusted p-values ranged from 0.440 to 1.000) and all Bland-Altman plots included zero difference within the limits of agreement. Therefore, the manual and the automated methods appear to be sufficiently consistent. These results foster the clinical application of PEREMG testing on the EquiTest platform.

Original languageEnglish
Pages (from-to)126-133
Number of pages8
JournalJournal of Electromyography and Kinesiology
Volume24
Issue number1
DOIs
Publication statusPublished - Feb 2014

Keywords

  • EMG
  • EquiTest
  • Human
  • Normative data
  • Postural evoked responses
  • Posture

ASJC Scopus subject areas

  • Neuroscience (miscellaneous)
  • Biophysics
  • Clinical Neurology

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