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Volume 25 |
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Number 1 |
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Published by : PROFESSIONAL MEDICAL PUBLICATIONS |
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ISSN 1681-715X |
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ORIGINAL ARTICLE |
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Volume 25 |
January - March 2009 |
Number 1 |
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The pattern of modulation of short latency reflex
linking the pretibial muscles to the knee
extensors during gait in humanKhosro K. Kalantari1, Rhonald H. Baxendale2
ABSTRACT
Objective: To find out pattern of modulation of heteronymous reflex linking the pretibial muscles to quadriceps motoneurones in normal subjects during treadmill walking.
Methodology: A non-randomized quasi-experimental study was performed in ten cases in Shahid Beheshti University (MC) Tehran, Iran, from September 2006 to August 2007. The reflex was elicited by applying stimuli of three time’s motor threshold in tibialis anterior to common peroneal nerve at several instants of gait cycle. Surface EMGs from tibialis anterior, vastus medialis and rectus femoris of the right leg was used to measure the intensity of the muscular activity and the magnitude of the reflex. The data were analysed by Pearson test for the strength of their correlation.
Results: The reflex showed a significant correlation with the intensity of contraction in quadriceps especially during the early stance phase. The correlation was poor during transition period from stance to swing where rectus femoris showed a small peak of activity. The peak of activity in tibialis anterior was on average 69±21ms preceded that of quadriceps.
Conclusions: This precedence of activity in tibialis anterior and the strong presence of the reflex during the early stance phase may indicate a positive feed-forward effect from ankle flexor afferents to quadriceps.
KEY WORDS: Quadriceps, Pretibial muscles, Feed forward, Reflex.
Pak J Med Sci January - March 2009 Vol. 25 No. 1 31-35
How to cite this article:
Kalantari KK, Baxendale RH. The pattern of modulation of short latency reflex linking the pretibial muscles to the knee extensors during gait in human. Pak J Med Sci 2009;25(1):31-35.
1. Dr. Khosro K. Kalantari, PT, PhD,
Department of Physiotherapy,
Shahid Beheshti University (MC),
Tehran, Iran
2. Dr. Rhonald H. Baxendale, PhD,
Department of Neuroscience and Biomedical System,
University of Glasgow,
Glasgow, UK.
Correspondence
Dr. Khosro K. Kalantari
Dept. of Physiotherapy, Faculty of Rehabilitation,
Shahid Beheshti University (MC),
Opposite to Bou Ali Hospital,
Damavand Road, Tehran Iran 16169.
Email: khosro_khademi@yahoo.co.uk
* Received for Publication: August 26, 2008
* Revision Received: November, 27, 2008
* Revision Accepted : December 15, 2008
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