PMID: 616885Jan 1, 1977Paper

Changes in reflex excitability of spinal motor neurons during day sleep in newborn infants

Neuroscience and Behavioral Physiology
I A Vakhrameeva, M L Finkel

Abstract

A study was made of monosynaptic reflexes elicited by electrical stimulation of the ulnar and fibular nerves (H-reflexes) in newborn children, age five to seven days, during the sleeping--waking cycle. The amplitude of the H-responses was maximal and the coefficient of variation was minimal during the orthodox sleep state (OS) characterized by slow EEG waves and synchronous movement of the chest and stomach. During paradoxial sleep (PS), characterized by desynchronous EEG activity, rapid eye movements, and asynchronous breathing movements of the chest and stomach, the amplitude of the H-responses fell to 25 to 40% of the level during OS, and the coefficient of variation was in excess of 100%. The amplitude of H responses during the waking state was 60% that of the OS stage. The results of the study are considered from the point of view of existing theories about the reorganization of the system of controlling movements during the sleeping--waking cycle.

References

Apr 1, 1966·Electroencephalography and Clinical Neurophysiology·A ShimizuZ Kaneko
Feb 15, 1968·The Japanese Journal of Physiology·K Kubota, R Tanaka
Jan 1, 1967·Pflügers Archiv für die gesamte Physiologie des Menschen und der Tiere·G CarliO Pompeiano
Jan 1, 1967·Biologia Neonatorum. Neo-natal Studies·H F PrechtlD K Grant
Jul 1, 1962·Proceedings of the Society for Experimental Biology and Medicine·R HODES, I GRIBETZ
Jul 1, 1963·Journal of Neurophysiology·T HONGOH SHIMAZU
Dec 1, 1964·Electroencephalography and Clinical Neurophysiology·R HODES, W C DEMENT

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