RAPID COMMUNICATION Cortical Control of Human Motoneuron Firing During Isometric Contraction
نویسندگان
چکیده
Salenius, Stephan, Karin Portin, Matti Kajola, Riitta Salmelin, synaptic currents flowing mainly in the fissural cortex. It and Riitta Hari. Cortical control of human motoneuron firing allows noninvasive monitoring of cortical activity with a during isometric contraction. J. Neurophysiol. 77: 3401–3405, reasonable spatial accuracy while maintaining an excellent 1997. We recorded whole scalp magnetoencephalographic (MEG) temporal resolution (Hämäläinen et al. 1993). signals simultaneously with the surface electromyogram from up-
منابع مشابه
Cortical control of human motoneuron firing during isometric contraction.
We recorded whole scalp magnetoencephalographic (MEG) signals simultaneously with the surface electromyogram from upper and lower limb muscles of six healthy right-handed adults during voluntary isometric contraction. The 15- to 33-Hz MEG signals, originating from the anterior bank of the central sulcus, i.e., the primary motor cortex, were coherent with motor unit firing in all subjects and fo...
متن کاملRelationship between firing rate and recruitment threshold of motoneurons in voluntary 1 isometric contractions
25 We employed a surface electromyographic (EMG) signal decomposition technology to study the 26 control properties of numerous simultaneously active motor units. Six healthy human subjects of 27 comparable age (21 ± 0.63 yr) and physical fitness were recruited to perform isometric 28 contractions of the vastus lateralis (VL), first dorsal interosseous (FDI), and tibialis anterior (TA) 29 muscl...
متن کاملFiring rates of motor units in human vastus lateralis muscle during fatiguing isometric contractions.
We investigated the firing rate of motor units in the vastus lateralis muscle in five healthy young men (mean = 21.4 yr, SD = 0.9) during a sequence of isometric constant-torque contractions repeated to exhaustion. The contractions were sustained at 20% of the maximal voluntary level, measured at the beginning of the test sequence. Electromyographic (EMG) signals were recorded via quadrifilar f...
متن کاملRelationship between firing rate and recruitment threshold of motoneurons in voluntary isometric contractions.
We used surface EMG signal decomposition technology to study the control properties of numerous simultaneously active motor units. Six healthy human subjects of comparable age (21 +/- 0.63 yr) and physical fitness were recruited to perform isometric contractions of the vastus lateralis (VL), first dorsal interosseous (FDI), and tibialis anterior (TA) muscles at the 20, 50, 80, and 100% maximum ...
متن کاملExcitability at the motoneuron pool and motor cortex is specifically modulated in lengthening compared to isometric contractions.
Neural control of muscle contraction seems to be unique during muscle lengthening. The present study aimed to determine the specific sites of modulatory control for lengthening compared with isometric contractions. We used stimulation of the motor cortex and corticospinal tract to observe changes at the spinal and cortical levels. Motor-evoked potentials (MEPs) and cervicomedullary MEPs (CMEPs)...
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تاریخ انتشار 1997