Journal of the Korean Pediatric Society 1976;19(11):859-866.
Published online November 30, 1976.
EMG Study of Muscle Tonus in Neonates (in various postures)
Sang Hyeup Kim, Ho Sung Lee
Department of Pediatrics,Seoul National University Hospital
EMG 에 依한 新生兒 muscle tonus 에 關한 硏究
金相協, 李鎬成
서울大學校 醫科大學 小兒科學敎室
In order to study the developmental aspects and changes in various posture of muscle tonus in neonates, EMG records were taken with portable E&M physiograph DMP-4A Surfacee electrode were attached on the back muscle of neck and abdominal wall, beneath the umbilicus. The following results were obtained. 1.Abdominal wall muscle revealed slightly higher amplitude in supine position rather than prone position whereas posterior neck muscle revealed mildly higher amplitude in prone position rather than supine position. 2.Phasic discharge pattern are seen through neonatal period. Pattern similar to tonic discharge are seen in some cases while neonate moves the legs and neck or crying. Authors assume above EMG study suggest that muscle tonus in neonates is not static condition but dynamic neural mechanism ie antigravity meckanism plays a role.

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