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Power spectral analysis of electromyogram and compound muscle action potential during muscle fatigue and recovery.
Author(s) -
Mills K R
Publication year - 1982
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.1982.sp014201
Subject(s) - muscle fatigue , contraction (grammar) , muscle contraction , electromyography , muscle power , compound muscle action potential , stimulation , chemistry , electrophysiology , medicine , physical medicine and rehabilitation
1. The power spectral changes of the voluntary electromyogram (e.m.g.) and of the compound muscle action potential (c.m.a.p.) evoked by supramaximal nerve stimulation have been compared in fatigue and recovery of human voluntary muscle contraction. 2. The mean power frequency (m.p.f.) of the voluntary e.m.g. and that of the c.m.a.p. are similar during fatigue. Power spectral shift can be largely accounted for by change in shape of muscle action potentials. 3. The recovery rates of force and action potential amplitude are similar, being half complete at 30 s. M.p.f. and relaxation rate recover more slowly, being half complete at 3 min. 4. It is suggested that the recovery of power spectral changes is dependent on the metabolic state of the muscle.