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European Journal of Applied Physiology

, Volume 114, Issue 1, pp 113–121 | Cite as

Assessment of calf muscle fatigue during submaximal exercise using transcranial magnetic stimulation versus transcutaneous motor nerve stimulation

  • Simon GreenEmail author
  • Emily Robinson
  • Emily Wallis
Original Article

Abstract

Purpose

Few studies have assessed the time-dependent response of fatigue (i.e., loss of force) during submaximal exercise without the use of maximum contractions. There is unexplored potential in the use of the superimposed muscle twitch (SIT), evoked by transcranial magnetic stimulation (TMS) or motor nerve stimulation (MNS), to assess fatigue during voluntary submaximal contractions. For the human triceps surae muscles, there are also no data on TMS-evoked twitches.

Methods

To optimise the TMS stimulus for assessment of fatigue, we first tested the effects of TMS power (40, 55, 70, 85, 100 % max) on SIT force during contractions (0–100 % MVC in 10 % increments) in six subjects. Then, we compared SIT responses (TMS and MNS) during submaximal contractions and MVCs (all at 60 s intervals) during a continuous protocol of intermittent contractions (30 % MVC) consisting of consecutive 5 min periods of baseline, fatigue (ischaemia) and recovery.

Results

For TMS, SIT force increased as a diminishing function of TMS power (P < 0.05), the relationships between SIT force and the force of voluntary contraction at all TMS powers were parabolic, and SIT force was maximised at ~20–40 % MVC. During intermittent contractions, MVC and SIT forces were stable during baseline, decreased similarly during ischaemia by 40–50 % (P < 0.05), and recovered similarly to baseline values (P > 0.05) before the end of the protocol.

Conclusion

TMS can be used to evoke twitches during submaximal contractions of the human calf muscle and, along with MNS, used to assess fatigue during submaximal exercise.

Keywords

Transcranial magnetic stimulation Motor nerve stimulation Ischaemia Voluntary contractions Calf muscle 

Notes

Acknowledgments

The authors thank Professors Simon Gandevia and Janet Taylor from Neuroscience Research Australia for their help and advice in the early phase of this project.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.School of Science and Health, University of Western SydneyCampbelltownAustralia
  2. 2.Department of PhysiologyUniversity of OtagoDunedinNew Zealand

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