High frequency vibration conditioning stimulation centrally reduces myoelectrical manifestation of fatigue in healthy subjects

Roberto Casale, Haim Ring, Alberto Rainoldi

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: Vibration conditioning has been adopted as a tool to improve muscle force and reduce fatigue onset in various rehabilitation settings. This study was designed to asses if high frequency vibration can induce some conditioning effects detectable in surface EMG (sEMG) signal; and whether these effects are central or peripheral in origin. Design: 300 Hz vibration was applied for 30 min during 5 consecutive days, to the right biceps brachii muscle of 10 healthy males aged from 25 to 50 years. sEMG was recorded with a 16 electrode linear array placed on the skin overlying the vibrated muscle. The test protocol consisted of 30% and 60% maximal voluntary contraction (MVC) as well as involuntary (electrically elicited) contractions before and after treatment. Results: No statistically significant differences were found between PRE and POST vibration conditioning when involuntary stimulus-evoked contraction and 30% MVC were used. Significant differences in the initial values and rates of change of muscle fibre conduction velocity were found only at 60% MVC. Conclusions: 300 Hz vibration did not induce any peripheral changes as demonstrated by the lack of differences when fatigue was electrically induced. Differences were found only when the muscle was voluntarily fatigued at 60% MVC suggesting a modification in the centrally driven motor unit recruitment order, and interpreted as an adaptive response to the reiteration of the vibratory conditioning.

Original languageEnglish
Pages (from-to)998-1004
Number of pages7
JournalJournal of Electromyography and Kinesiology
Volume19
Issue number5
DOIs
Publication statusPublished - Oct 2009

Keywords

  • Muscle fatigue
  • Rehabilitation
  • sEMG
  • Vibration

ASJC Scopus subject areas

  • Neuroscience (miscellaneous)
  • Biophysics
  • Clinical Neurology

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