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Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation
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Cortical voluntary activation testing methodology impacts central fatigue.

José Mira1,2, Thomas Lapole3, Robin Souron3

  • 1Laboratoire Interuniversitaire de Biologie de la Motricité, Université Savoie Mont Blanc, EA 7424, 73000, Chambéry, France.

European Journal of Applied Physiology
|July 9, 2017
PubMed
Summary

The continuous method for assessing cortical voluntary activation (VATMS) reveals greater central fatigue than the traditional method with short recovery periods. This difference diminishes after 2 minutes of rest.

Keywords:
Central fatigueCorticospinal excitabilityIntracortical inhibitionMaximal muscle contractionRecoveryTranscranial magnetic stimulation

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Area of Science:

  • Neuromuscular Physiology
  • Exercise Science
  • Sports Medicine

Background:

  • Cortical voluntary activation (VATMS) assessment typically involves superimposed transcranial magnetic stimulation (TMS) during maximal voluntary contractions (MVCs) with brief rest intervals.
  • Short recovery periods between contractions may influence the accurate measurement of central fatigue.

Purpose of the Study:

  • To compare the traditional (TRADI) method of assessing VATMS with short recovery periods against a continuous (CONTI) method.
  • To determine if the TRADI method underestimates central fatigue due to insufficient recovery.

Main Methods:

  • VATMS, motor-evoked potentials (MEPs), and cortical silent periods (CSPs) were measured in 12 participants before and after a 2-min sustained knee extensor MVC.
  • Two conditions were used: TRADI with 7-s rests between MVC levels and CONTI with no rest between MVC levels.

Main Results:

  • Both methods showed equal MVC depression post-exercise.
  • The CONTI method revealed a significantly greater decrease in VATMS post-exercise compared to TRADI (-29% vs. -9%).
  • Differences in MEP and CSP between methods were observed immediately post-exercise but resolved after 2 minutes of recovery.

Conclusions:

  • Short recovery intervals significantly impact the measurement of VATMS and central fatigue parameters.
  • The continuous method is recommended over the traditional method for a more accurate assessment of voluntary activation deficits after fatiguing exercise.