Reflex Origin For The Slowing Of Motoneurone Firing Rates In Fatigue Of Human Voluntary Contractions.
B. Bigland-Ritchie, N. Dawson, R. Johansson, O. Lippold
Published 1986 · Medicine, Psychology
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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.
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