Fatiguing effects of indirect vibration stimulation in upper limb muscles: pre, post and during isometric contractions superimposed on upper limb vibration

Amit N. Pujari* (Corresponding Author), Richard D. Neilson, Marco Cardinale

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Downloads (Pure)


Whole-body vibration and upper limb vibration (ULV) continue to gain popularity as exercise intervention for rehabilitation and sports applications. However, the fatiguing effects of indirect vibration stimulation are not yet fully understood. We investigated the effects of ULV stimulation superimposed on fatiguing isometric contractions using a purpose developed upper limb stimulation device. Thirteen healthy volunteers were exposed to both ULV superimposed to fatiguing isometric contractions (V) and isometric contractions alone Control (C). Both Vibration (V) and Control (C) exercises were performed at 80% of the maximum voluntary contractions. The stimulation used was 30 Hz frequency of 0.4 mm amplitude. Surface-electromyographic (EMG) activity of the Biceps Brachii, Triceps Brachii and Flexor Carpi Radialis were measured. EMG amplitude (EMGrms) and mean frequency (MEF) were computed to quantify muscle activity and fatigue levels. All muscles displayed significantly higher reduction in MEFs and a corresponding significant increase in EMGrms with the V than the Control, during fatiguing contractions (p < 0.05). Post vibration, all muscles showed higher levels of MEFs after recovery compared to the control. Our results show that near-maximal isometric fatiguing contractions superimposed on vibration stimulation lead to a higher rate of fatigue development compared to the isometric contraction alone in the upper limb muscles. Results also show higher manifestation of mechanical fatigue post treatment with vibration compared to the control. Vibration superimposed on isometric contraction not only seems to alter the neuromuscular function during fatiguing efforts by inducing higher neuromuscular load but also post vibration treatment.
Original languageEnglish
Article number190019
JournalRoyal Society Open Science
Issue number10
Publication statusPublished - 2 Oct 2019


  • vibration simulation
  • electromyography
  • fatigue
  • neuromuscular response
  • isometric contraction
  • Neuromuscular response
  • Vibration stimulation
  • Isometric contraction
  • Fatigue
  • Electromyography

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'Fatiguing effects of indirect vibration stimulation in upper limb muscles: pre, post and during isometric contractions superimposed on upper limb vibration'. Together they form a unique fingerprint.

  • Profiles

    No photo of Richard Neilson

    Richard Neilson

    Person: Academic

    Cite this