Origin of the low-level EMG during the silent period following transcranial magnetic stimulation
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Origin of the low-level EMG during the silent period following transcranial magnetic stimulation. / Butler, Jane E; Petersen, Nicolas C; Herbert, Robert D; Gandevia, Simon C; Taylor, Janet L.
In: Clinical Neurophysiology, Vol. 123, No. 7, 2012, p. 1409-1414.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Origin of the low-level EMG during the silent period following transcranial magnetic stimulation
AU - Butler, Jane E
AU - Petersen, Nicolas C
AU - Herbert, Robert D
AU - Gandevia, Simon C
AU - Taylor, Janet L
N1 - CURIS 2012 5200 009
PY - 2012
Y1 - 2012
N2 - OBJECTIVE: The cortical silent period refers to a period of near silence in the electromyogram (EMG) after transcranial magnetic stimulation (TMS) of the motor cortex during contraction. However, low-level EMG of unknown origin is often present. We hypothesised that it arises through spinal reflexes. Sudden lengthening of the muscle as force drops during the silent period could excite muscle spindles and facilitate motoneurones. METHODS: Subjects (n=8) performed maximal isometric, shortening and lengthening contractions of the elbow flexors during which TMS (90-100% output) was delivered over the motor cortex. The rate of flexion during shortening contractions reduced muscle lengthening caused by muscle relaxation. Surface EMG was recorded from biceps brachii and brachioradialis, and the low-level EMG during silent periods produced by TMS was measured. RESULTS: Low-level EMG activity was reduced on average by 68% in biceps and 63% in brachioradialis in the shortening contraction compared to all other contraction conditions (p
AB - OBJECTIVE: The cortical silent period refers to a period of near silence in the electromyogram (EMG) after transcranial magnetic stimulation (TMS) of the motor cortex during contraction. However, low-level EMG of unknown origin is often present. We hypothesised that it arises through spinal reflexes. Sudden lengthening of the muscle as force drops during the silent period could excite muscle spindles and facilitate motoneurones. METHODS: Subjects (n=8) performed maximal isometric, shortening and lengthening contractions of the elbow flexors during which TMS (90-100% output) was delivered over the motor cortex. The rate of flexion during shortening contractions reduced muscle lengthening caused by muscle relaxation. Surface EMG was recorded from biceps brachii and brachioradialis, and the low-level EMG during silent periods produced by TMS was measured. RESULTS: Low-level EMG activity was reduced on average by 68% in biceps and 63% in brachioradialis in the shortening contraction compared to all other contraction conditions (p
U2 - 10.1016/j.clinph.2011.11.034
DO - 10.1016/j.clinph.2011.11.034
M3 - Journal article
C2 - 22209661
VL - 123
SP - 1409
EP - 1414
JO - Clinical Neurophysiology
JF - Clinical Neurophysiology
SN - 1388-2457
IS - 7
ER -
ID: 36077477