Abstract：
:Transmastoid stimulation in human subjects evokes a single descending volley in corticospinal axons. Electromyographic (EMG) responses to transmastoid stimuli measured in the relaxed elbow flexor muscles after a maximal voluntary contraction (MVC) are depressed by approximately 50% compared to prior to the MVC. The depression recovers over 2 min. Responses can also be depressed in the relaxed muscle after submaximal contractions and when measured during weak contractions after an MVC. The depression may reflect a decrease in efficacy at the corticospinal-motoneuronal synapse. If so, an activity-dependent decrease in the effectiveness of cortical drive to the motoneurones could affect the control of many voluntary movements.
journal_name
Adv Exp Med Bioljournal_title
Advances in experimental medicine and biologyauthors
Taylor JL,Petersen NT,Butler JE,Gandevia Sdoi
10.1007/978-1-4615-0713-0_49subject
Has Abstractpub_date
2002-01-01 00:00:00pages
435-41eissn
0065-2598issn
2214-8019journal_volume
508pub_type
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