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Journal of the Korean Academy of Rehabilitation Medicine 1999;23(5):993-999.
The Effects of Jendrassik Maneuver on the T-reflex and the H-reflex of Soleus Muscle.
Yoon, Tae Sik , Kim, Eun Jong , Hwang, Jin Won , Choi, Ok Chae , Lee, Ju Young
Department of Rehabilitation Medicine, Ewha Womans University College of Medicine.
Jendrassik 수기가 비복근에서의 T-반사와 H-반사에 미치는 영향
윤태식, 김은정, 황진원, 최옥채, 이주영
이화여자대학교 의과대학 재활의학과
Abstract

Objective
To investigate the effects of Jendrassik maneuver on latency and amplitude of the T-reflex and H-reflex of the soleus muscle in normal adults.


Method
The T-reflex and H-reflex tests were performed on sixty normal adults with standardized technique using the soleus muscle. The shortest latency and the largest peak-to-peak amplitude were chosen for representative values.


Results
The results were as follows: 1) There was a significant difference in latency of the T-reflex between with and without Jendrassik maneuver. 2) The increment ratio of the amplitude with Jendrassik maneuver was 88% in the T-reflex and 18% in the H-reflex. There were a significant difference in the amplitude of both reflexes between with and without Jendrassik maneuver. 3) A high correlation was present between the latency of H- & T-reflex and the length.


Conclusion
According to these results, we suggest that Jendrassik maneuver primarily increases the sensitivity of muscle spindles and decreases the presynaptic inhibition of the Ia terminals at cortical, subcortical and spinal levels. Jendrassik maneuver can be a useful tool in cases of clinically decreased or absent deep tendon reflex.

Key Words: Jendrassik maneuver, T-reflex &, H-reflex of soleus


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