Acoustic myography of the human quadriceps muscle during intermittent fatiguing activity

Dalton P.A., Comerford M.J. and Stokes M.J. (1992) Acoustic myography of the human quadriceps muscle during intermittent fatiguing activity. Journal of the Neurological Sciences, 109 1: 56-60. doi:10.1016/0022-510X(92)90093-Z

Author Dalton P.A.
Comerford M.J.
Stokes M.J.
Title Acoustic myography of the human quadriceps muscle during intermittent fatiguing activity
Journal name Journal of the Neurological Sciences   Check publisher's open access policy
ISSN 0022-510X
Publication date 1992-01-01
Sub-type Article (original research)
DOI 10.1016/0022-510X(92)90093-Z
Volume 109
Issue 1
Start page 56
End page 60
Total pages 5
Subject 1302 Curriculum and Pedagogy
2728 Clinical Neurology
2746 Surgery
2800 Neuroscience
2806 Developmental Neuroscience
2808 Neurology
Abstract Integrated acoustic myography (IAMG) and electromyography (IEMG) were recorded over rectus femoris (RF) in six healthy subjects during a series of intermittent isometric contractions of quadriceps. Contractions were held for 10 sec with 10 sec rest between each, commencing at 75% maximum voluntary contraction (MVC) force and continuing to 40% MVC. The IAMG activity initially decreased (75%-60% MVC) in a linear relationship (r = 0.9) with fatigue (i.e. force loss) but then plateaued and increased once force fell below 52% MVC. The AMG/force relationship for the whole fatiguing protocol (i.e. 75%-40% MVC) was quadratic (r = 0.87). The IEMG also showed a quadratic relationship with force (r = 0.85) but activity initially increased before decreasing. The results of the present study quantify the relationship between AMG and force in quadriceps during fatigue from intermittent contractions commencing at 75% MVC. The findings confirm previous observations that AMG decreases with fatigue during strong contractions but the quadratic relationship found in the present study differs to that for other muscles during sustained contractions. The results also suggest that simultaneous recordings of AMG and EMG may help distinguish central and peripheral fatigue. Acoustic myography may therefore be a useful non-invasive monitor of force during early fatiguing activity using the present protocol but the need to study AMG during fatigue of different muscles and force levels is stressed.
Keyword Acoustic myography
Muscle fatigue
Muscle sounds
Quadriceps muscle
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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