Electromyographic signs of neuromuscular fatigue are concomitant with further increase in ventilation during static handgrip

Hug, F., Faucher, M., Marqueste, T., Guillot, C., Kipson, N. and Jammes, Y. (2004) Electromyographic signs of neuromuscular fatigue are concomitant with further increase in ventilation during static handgrip. Clinical Physiology and Functional Imaging, 24 1: 25-32. doi:10.1046/j.1475-0961.2003.00525.x


Author Hug, F.
Faucher, M.
Marqueste, T.
Guillot, C.
Kipson, N.
Jammes, Y.
Title Electromyographic signs of neuromuscular fatigue are concomitant with further increase in ventilation during static handgrip
Journal name Clinical Physiology and Functional Imaging   Check publisher's open access policy
ISSN 1475-0961
1475-097X
Publication date 2004-01
Sub-type Article (original research)
DOI 10.1046/j.1475-0961.2003.00525.x
Volume 24
Issue 1
Start page 25
End page 32
Total pages 8
Place of publication Chichester, West Sussex, United Kingdom
Publisher Wiley-Blackwell
Language eng
Abstract We questioned if a non-linear increase in ventilation defining a ventilatory threshold (VTh) accompanied the electromyographic (EMG) signs of neuromuscular fatigue. Indeed, the intramuscular accumulation of metabolites may activate the afferent nervous pathways responsible for both the ‘muscle wisdom’ phenomenon and the respiratory centre activation. During inframaximal (50%) handgrip sustained until exhaustion, minute ventilation (VE), VE/Vo2 and VE/Vco2 ratios were measured simultaneously with surface EMG of the ‘flexor digitorum’ muscle. VTh was defined as a non-linear VE increase and/or an abrupt VE/Vo2 increase without any concomitant increase in the VE/Vco2 ratio. Handgrip was repeated during complete arterial blood flow interruption in order to suppress any venous return from the exercising forearm. In both control and blood flow interruption conditions, an abrupt increase in the VE/Vo2 ratio was measured in the majority of trials (13 of 15 and 14 of 15, respectively) and the EMG signs of neuromuscular fatigue (a decline in median frequency and/or a non-linear increase in low-frequency EMG energies, EL) were concomitant with the VTh determination. Thus, VTh occurs during sustained static contraction and is concomitant with EMG signs of neuromuscular fatigue. Neurogenic factors seem to be responsible for the two responses which persist despite the absence of any release of metabolites in the circulation.
Keyword Man
Median frequency
Power spectrum
Surface electromyography
Ventilatory threshold
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Health and Rehabilitation Sciences Publications
 
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Created: Wed, 28 Aug 2013, 16:50:15 EST by Francois Hug on behalf of School of Health & Rehabilitation Sciences