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Reflex origin for the slowing of motoneurone firing rates in fatigue of human voluntary contractions.
Author(s) -
Bigland-Ritchie B R,
Dawson N J,
Johansson R S,
Lippold O C
Publication year - 1986
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.1986.sp016263
Subject(s) - reflex , turnover , muscle fatigue , contraction (grammar) , muscle contraction , peripheral , medicine , human muscle , anesthesia , cardiology , physical medicine and rehabilitation , electromyography , skeletal muscle , management , economics
During fatigue from a sustained maximal voluntary contraction (m.v.c.) the mean motoneurone discharge rates decline. In the present experiments we found no recovery of firing rates after 3 min of rest if the fatigued muscle was kept ischaemic, but near full recovery 3 min after the blood supply was restored. Since 3 min is thus sufficient time for recovery of any central changes in excitability, the results support the hypothesis that, during fatigue, motoneurone firing rates may be regulated by a peripheral reflex originating in response to fatigue‐induced changes within the muscle.