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Journal of the Korean Academy of Rehabilitation Medicine 1999;23(3):524-530.
Analysis of Increased Myotatic Reflex in Children with Spastic Cerebral Palsy.
Kim, Sei Joo , Lee, Sang Heon , Kim, Woo Sub , Lee, Eun Ha , Park, Yun Hyung , Na, Jin Kyong , Song, Eun Beom
Department of Rehabilitation Medicine, Collage of Medicine, Korea University, Seoul, Korea.
경직형 뇌성마비환아의 과신전반사의 양상
김세주, 이상헌, 김우섭, 이은하, 박윤형, 나진경, 송은범
고려대학교 의과대학 재활의학교실

The purpose of this study was to analyse the myotatic reflex characteristics of children with spastic cerebral palsy compared with normal infants and children

Thirty four children with spastic cerebral palsy and 42 normal children were examined. The tendon taps were applied to the patellar and Achilles' tendons and shin using an electric reflex hammer. Compound muscle action potentials (CMAPs) were recorded from hamstring (HAM), rectus femoris (RF), tibialis anterior (TA), and gastrocnemias (GCL) by surface electrodes. The response ratios of HAMs/RF and TA/GCL were determined from CMAP amplitude.

The mean HAM/RF ratios after patellar taps were 0.32⁑0.33, 0.37⁑0.33 and 0.32⁑0.19 in children with cerebral palsy, normal infants, and children over 1 year of age, respectively. The mean TA/GCL ratios following Achilles tap were 0.40⁑0.30, 0.93⁑0.11, and 0.25⁑0.14 in children with cerebral palsy, normal infants, and children over 1 year of age, respectively. All the spastic cerebral palsy children showed muscle responses in RF, HAM, TA and GCL after shin tap, but normal children did not.

The results reflect that the reflex responses are exaggerated in children with spastic cerebral palsy, and it can be used in the early diagnosis of cerebral palsy.

Key Words: Myotatic reflex, Myotatic reflex, Cerebral palsy, Hyperreflexia


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