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Titolo:
CORRELATIONS BETWEEN SIZE PARAMETERS AND THE AMPLITUDE OF THE EXCITATORY POSTSYNAPTIC POTENTIAL EVOKED BY MAGNETIC BRAIN-STIMULATION IN HUMAN HAND MUSCLE MOTONEURONS
Autore:
AWISZUS F; FEISTNER H;
Indirizzi:
HANNOVER MED SCH,NEUROPHYSIOL ABT D-30623 HANNOVER GERMANY HANNOVER MED SCH,NEUROL KLIN KLIN NEUROPHYSIOL D-30623 HANNOVER GERMANY
Titolo Testata:
Experimental Brain Research
fascicolo: 1, volume: 98, anno: 1994,
pagine: 128 - 134
SICI:
0014-4819(1994)98:1<128:CBSPAT>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
AXONAL CONDUCTION-VELOCITY; MOTOR-UNIT RESPONSES; CORTICOSPINAL PROJECTIONS; SPINAL MOTONEURONS; LIMB MOTONEURONS; MACRO-EMG; NEURONS; CAT; EXCITABILITY; CONTRACTIONS;
Keywords:
MOTONEURON; MAGNETIC BRAIN STIMULATION; EXCITATORY POSTSYNAPTIC POTENTIAL SIZE; MACRO EMG; SIZE PRINCIPLE; HUMAN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
41
Recensione:
Indirizzi per estratti:
Citazione:
F. Awiszus e H. Feistner, "CORRELATIONS BETWEEN SIZE PARAMETERS AND THE AMPLITUDE OF THE EXCITATORY POSTSYNAPTIC POTENTIAL EVOKED BY MAGNETIC BRAIN-STIMULATION IN HUMAN HAND MUSCLE MOTONEURONS", Experimental Brain Research, 98(1), 1994, pp. 128-134

Abstract

According to the size principle for motoneurons one would expect thatan excitatory stimulus given to a motoneuronal pool should evoke small excitatory postsynaptic potentials (EPSPs) in large and large EPSPs in small motoneurons of the pool. In this study this expectation was tested for the motoneuron pool of the first dorsal interosseus muscle of man excited by a magnetic stimulus given to the contralateral motor cortex. In total, 60 first dorsal interosseus motor units from three healthy volunteers were investigated. For each unit the EPSP size induced by the magnetic brain stimulus was assessed indirectly through a cross correlation of magnetic brain stimuli with motor unit discharges during a slight voluntary contraction. In addition to the indirect measurement of EPSP size, three indicators of motoneuronal size were obtained for each unit: the area the macroelectromyogram (Macro EMG) of theunit encloses with the baseline, the peak-to-peak amplitude of the Macro EMG, and the ''true'' latency from the magnetic stimulus to the motor unit which in turn provides an indirect estimate for the conduction velocity of the motoneuronal axon. It was found that all three measures of motoneuron size were significantly negatively correlated with the estimates of EPSP amplitude. Such significant negative correlationswere found not only in the pooled data but also in the data from eachsubject individually. These correlations reveal that a magnetic brainstimulus induces small EPSPs in large and large EPSPs in small motoneurons of the first dorsal interosseus muscle of man.

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Documento generato il 02/12/20 alle ore 04:40:52