<Originals>Electrophysiological Properties of Compensatory Activated Phrenic Motoneurons in Rats

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MIYATA, H. and WADA, N., Electrolhysiological Properties of Cpmpensatory Activated Phrenic Motoneurons in Rats. Abv. Exerc. Sports Physiol., Vol.10, No.2 pp.49-53, 2004. To examine the activity-dependent plasticity of motoneuron function, male adult rats were divided into a control (CTL) froup(n=17) and a denervation group(n=17) that had been subjected to unilateral phrenicotomy 4 weeks previously. Electrophysiological mambrane properties (resting potential (mV), rheobase (nA) and input resistance (Mohm)) of the contralateral compensatory activated (CAC) phrenic motoneurons were measured. As compared to the CTL hemidiaphrabm, the CAC hemidiaphragm showed increases in electrical activity by 51% one minute after the denervation, and ingreases in succinate dehydrogenase activity by 31% at the end of experiment. There were significant inverse relationships between the rheobase and input resistance of motoneurons in the both groups (r=-0,48, -0.62). Mean value of the rheobase in non-recruited motoneurons was significantly higher than that in recruited motoneurons in the both groups. Most of the motoneurons wiht low rheobase (<5nA) were recruited in the CAC, but not in the CTL motoneurons. As the results, the incidence of recruited motoneuron in the CAC (69%) was higher than that in the CTL motoneurons (48%). Mean interval of action potentials of the recruited motoneuron was identical between the CAC (38ms) and CTL (39ms) motoneurons. We concluded that a main strategy of the phrenic motoneurons to the CAC induced by contralateral phrenicotomy was additional recruitment of motoneurons with low rheobase.
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<Originals>Electrophysiological Properties of Compensatory Activated Phrenic Motoneurons in Rats

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