Pakistan Journal of Medical Sciences

Published by : PROFESSIONAL MEDICAL PUBLICATIONS

ISSN 1681-715X

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Volume 23

October - December 2007 (Part-I)

Number  5


 

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The gain modulation of the heteronymous
excitation of quadriceps with changes in position
of the knee and hip joints in humans

Khosro K. Kalantari1, Ronald H. Baxendale2

ABSTRACT

Objective: A potent heteronymous excitation of quadriceps motoneurones via common peroneal group I and II afferents has been demonstrated in normal subjects. The aim of this study was to establish the contribution of knee and hip proprioceptors on the modulation of this biphasic facilitation.

Methodology: Single 0.2ms pulses were delivered to common peroneal nerve at the intensity of 2xmotor threshold in tibialis anterior. The peak to peak amplitude and area of the excitatory responses were measured in ongoing EMG of voluntarily contracted rectus femoris at different knee and hip joint positions.

Results: The reflex showed a significant inhibition with the knee flexion (P < 0.0001) and hip extension (P < 0.01).

Conclusion: It was concluded that coordinate activation of ankle flexors and knee extensors could modulated by the knee and hip joints proprioceptors.

KEY WORDS: Common peroneal nerve, Reflex, Reflex of inhibition, Quadriceps femoris.

Pak J Med Sci    October - December 2007 (Part-I)    Vol. 23 No. 5    805-808


1. Dr. Khosro K. Kalantari, PhD, PT,
Dept. of Physiotherapy, Rehabilitation Faculty,
Shaheed Beheshti Medical University,
Tehran, Iran.
2. Dr. Ronald H. Baxendale, PhD,
Department of Neuroscience and Biomedical System,
Glasgow University, Glasgow, Scotland, UK, G12 8QQ.

Correspondence

Dr. Khosro Khademi Kalantari,
Dept. of Physiotherapy, Rehabilitation Faculty,
Shaheed Beheshti Medical University, Damavand Road,
Opposite Bou Ali Hospital, Tehran – Iran.
Email: khosro_khademi@yahoo.co.uk

* Received for Publication: April 9, 2007
* Revision Received: April 16, 2007
* Revision Accepted July 3, 2007



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