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Impact of stimulation frequency on neuromuscular fatigue

  • Florian VitryEmail author
  • Alain Martin
  • Maria Papaiordanidou
Original Article

Abstract

Purpose

The aim of the present study was to examine the frequency effects (20 Hz and 100 Hz) on neuromuscular fatigue using stimulation parameters favoring an indirect motor unit recruitment through the afferent pathway.

Methods

Nineteen subjects were divided into two groups: 20 Hz (n = 10) and 100 Hz (n = 9). The electrical stimulation session consisted of 25 stimulation trains (20 s ON/20 s OFF, pulse width: 1 ms) applied over the tibial nerve and delivered at an intensity evoking 10% maximal voluntary isometric contraction (MVIC). Before and after these protocols, MVIC was assessed, while neural changes were evaluated by the level of activation (VAL) and muscle changes were evaluated by the twitch associated with the maximal M-wave (Pt). For all stimulation trains, the real and the theoretical values of the torque-time integral (TTIr and TTIth, respectively) were calculated. The TTIr/TTIth ratio of the first train was calculated to evaluate the presence of extra torque.

Results

The main results showed a similar decrease in MVIC torque after both protocols accompanied by neural and muscle changes, as evidenced by the decrease in VAL and Pt. TTIr values across the 20-Hz trains remained constant, whereas they significantly decreased during the 100-Hz stimulation trains. The relative MVIC decrease was negatively correlated with TTIr/TTIth.

Conclusion

Results give evidence of an identical neuromuscular fatigue development between protocols, while lower stimulation frequency permitted preservation of a given torque level during the stimulation trains. The negative correlation between this fatigue development and TTIr/TTIth suggests that extra torque production induces greater voluntary torque losses.

Keywords

Extra torque Electrical stimulation Afferent feedback Voluntary activation level 

Abbreviations

ANOVA

Analysis of variance

EMG

Electromyographic activity

ET

Extra torque

MMAX

Maximal M-wave

MU

Motor unit

MVIC

Maximal voluntary isometric contraction

NMES

Neuromuscular electrical stimulation

Pt

Peak torque amplitude of the potentiated twitch associated to MMAX

SOL

Soleus

TTI

Torque-time integral

TTIr

Real torque-time integral

TTIth

Theoretical torque-time integral

VAL

Voluntary activation level

WPHF

Wide-pulse high frequency

Notes

Author contributions

FV, AM and MP conceived and designed research; FV conducted experiments; FV analyzed data; FV, AM and MP interpreted results of experiments; FV prepared figures; FV and MP drafted manuscript; FV, AM and MP edited and revised manuscript; FV, AM and MP approved final version of manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.INSERM UMR1093-CAPS, Université Bourgogne Franche-Comté, UFR des Sciences du SportDijonFrance

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