Detection and severity of low frequency fatigue in the human adductor pollicis muscle

Mellor R. and Stokes M.J. (1992) Detection and severity of low frequency fatigue in the human adductor pollicis muscle. Journal of the Neurological Sciences, 108 2: 196-201. doi:10.1016/0022-510X(92)90051-L

Author Mellor R.
Stokes M.J.
Title Detection and severity of low frequency fatigue in the human adductor pollicis muscle
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)90051-L
Volume 108
Issue 2
Start page 196
End page 201
Total pages 6
Subject 1302 Curriculum and Pedagogy
2728 Clinical Neurology
2746 Surgery
2800 Neuroscience
2806 Developmental Neuroscience
2808 Neurology
Abstract The sensitivity of electrical stimulation tests for detecting low frequency fatigue (LFF) and its duration were examined in the adductor pollicis muscle of ten normal subjects. Supramaximal stimulation was applied to the ulnar nerve at the wrist and values for test stimulation force ratios of 10:100 Hz, 15:100 Hz and 20:50 Hz (2 sec at each frequency with 5 min rest between each ratio) were obtained for fresh muscle. Fatigue was then induced by voluntary isometric contractions at 50% maximal voluntary force (MVC) repeated until only 30% MVC could be achieved. Contractions lasted 10 sec with 5 sec rest between each. The three test ratios were then repeated to monitor recovery at intervals up to 72 h after activity. High frequency forces returned to fresh values by 24 h but low frequency forces were all still significantly reduced. Forces at 10 and 15 Hz were still significantly reduced at 48 and 72 h (10 Hz > fatigue than 15 Hz). The low/high frequency ratios, calculated once 50 and 100 Hz forces had recovered, also demonstrated differences in revoery rates. Repeatability tests indicated that 10 Hz force was more variable than other frequencies and forces at all stimulation frequencies were repeatable on different days with a coefficient of variation of < 15%. Values for the 15:100 Hz ratio from fresh muscle in 22 normal subjects were 0.48±8. The 15:100 Hz ratio is suggested as the most appropriate test ratio for detecting LFF since 15 Hz force is more sensitive than 20 Hz and more stable than 10 Hz.
Keyword Adductor pollicis muscle
Low frequency fatigue
Muscle fatigue
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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