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pubmed-article:7562624pubmed:abstractText1. In healthy human subjects holding the index finger semi-extended at the metacarpophalangeal joint against a moderate load, electromyographic (EMG) activity was recorded from the finger extensor and flexor muscles during different stages of muscle fatigue. The aim was to study the effect of muscle fatigue on the level of background EMG activity and on the reflex responses to torque pulses causing sudden extensor unloadings. Paired comparisons were made between the averaged EMG and finger deflection responses under two conditions: (1) at a stage of fatigue (following a sustained co-contraction) when great effort was required to maintain the finger position, and (2) under non-fatigue conditions while the subject tried to produce similar background EMG levels to those in the corresponding fatigue trials. 2. Both the unloading reflex in the extensor and the concurrent stretch reflex in the flexor were significantly less pronounced and had a longer latency in the fatigue trials. Consequently, the finger deflections had a larger amplitude and were arrested later in the fatigue trials. 3. It is concluded that--with avoidance of 'automatic gain compensation', i.e. reflex modifications attributable to differences in background EMG levels--the servo-like action of the unloading and stretch reflexes is reduced in fatigued finger extensor and flexor muscles.lld:pubmed
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pubmed-article:7562624pubmed:articleTitleReduced servo-control of fatigued human finger extensor and flexor muscles.lld:pubmed
pubmed-article:7562624pubmed:affiliationDepartment of Clinical Neurophysiology, University Hospital, Uppsala, Sweden.lld:pubmed
pubmed-article:7562624pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:7562624pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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