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Reaction time can be measured during voluntary contractions with electrode array.

Y Le Mansec1, A Nordez1, S Dorel1

  • 1Faculty of Sport Sciences, Laboratory "Movement, Interactions, Performance" (EA 4334), University of Nantes, Nantes, France.

Clinical Physiology and Functional Imaging
|August 11, 2017
PubMed
Summary

This study found that premotor time (PMT) is the main component of reaction time (RT). Using an electrode array reliably measures electromyographic activity (EMG) onset for assessing RT components.

Keywords:
electromechanical delayelectromyographyisometricpremotor timereliability

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Area of Science:

  • Human movement science
  • Neuroscience
  • Biophysics

Background:

  • Reaction time (RT) is crucial in human performance, traditionally divided into premotor time (PMT) and electromechanical delay (EMD).
  • Accurate determination of electromyographic activity (EMG) onset for EMD calculation is challenging.
  • Assessing the reliability of RT, PMT, and EMD measurements is essential for research and practical applications.

Purpose of the Study:

  • To investigate the reliability of reaction time (RT), premotor time (PMT), and electromechanical delay (EMD) measurements.
  • To evaluate the effectiveness of a 64-channel electrode array for accurately detecting EMG onset.
  • To determine the proportion of PMT within the total RT.

Main Methods:

  • Twelve participants completed two sessions of voluntary isometric elbow flexion contractions.
  • Reaction time (RT) was measured from stimulus onset to mechanical response onset.
  • A 64-channel electrode array was employed to precisely identify EMG onset for EMD calculation.

Main Results:

  • Premotor time (PMT) constituted approximately 88% of the total reaction time (RT).
  • Coefficients of variation for all measured parameters (RT, PMT, EMD) were within a satisfactory range (11.9-13.4%).
  • The electrode array method proved relevant for measuring EMD.

Conclusions:

  • The use of a 64-channel electrode array is a valid method for assessing electromechanical delay (EMD).
  • Two trials per session are sufficient to reliably detect changes in reaction time (RT) components.
  • Premotor time (PMT) is the predominant component influencing overall reaction time (RT).