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Firing rate analysis using decomposition‐enhanced spike triggered averaging in the quadriceps femoris
Author(s) -
Conwit Robin A.,
Tracy Brian,
Cowl Alison,
McHugh Megan,
Stashuk Dan,
Brown William F.,
Metter E. Jeffrey
Publication year - 1998
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/(sici)1097-4598(199810)21:10<1338::aid-mus17>3.0.co;2-y
Subject(s) - motor unit , quadriceps femoris muscle , electromyography , quadriceps muscle , physical medicine and rehabilitation , contraction (grammar) , anatomy , mathematics , medicine , physical therapy , isometric exercise
Electromyographic signals detected from the quadriceps femoris during various constant force contractions were decomposed to identify individual motor unit discharges and mean firing rates (FRs). Subject and group mean FRs were calculated for each force level. Mean FR values and FR variability increased with force. Individual, subject, and group mean FRs showed slight increases until 30% of maximum voluntary contraction and larger increases thereafter. Findings are discussed in relation to motor unit recruitment, frequency modulation, and fatigue. © 1998 John Wiley & Sons, Inc. Muscle Nerve 21:1338–1340, 1998.