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Simultaneous measurement of muscle conduction velocity and emg power spectrum changes during fatigue
Author(s) -
Eberstein Arthur,
Beattie Bradley
Publication year - 1985
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.880080905
Subject(s) - isometric exercise , biceps , nerve conduction velocity , electromyography , contraction (grammar) , muscle fatigue , muscle contraction , biceps brachii muscle , medicine , anatomy , physical medicine and rehabilitation
Muscle conduction velocity and mean frequency of the electromyogram (EMG) spectrum were measured simultaneously in the biceps brachii muscles of nine healthy subjects during sustained isometric contraction. Recordings were made at 60% and 70% of the maximum voluntary contraction In all subjects, both conduction velocity and mean frequency decreased during the time period of the fatiguing contractions. Also, the muscle conduction velocity was found to vary linearly with the mean frequency. This demonstrates that the EMG spectral shifts observed during muscle fatigue are due to slowing of the conduction velocity.