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Facilitation From Hand Muscles Innervated by the Ulnar Nerve to the Extensor Carpi Radialis Motoneurone Pool in Humans: A Study With an Electromyogram-Averaging Technique.
MedLine Citation:
PMID:  23027106     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
SUMMARY:: Effects of low-threshold afferents of hand muscles innervated by the ulnar nerve on an excitability of the extensor carpi radialis (ECR) motoneurone pool in humans were examined using an electromyogram-averaging (EMG-A) technique. Changes of EMG-A of ECR exhibiting 10% of the maximum contraction by electrical stimulation to the ulnar nerve at the wrist (ES-UN) and mechanical stimulation to the hypothenar muscles (MS-HTM) and first dorsal interosseus (MS-FDI) were evaluated in eight normal human subjects. The ES-UN with the intensity immediately below the motor threshold and MS-HTM and -FDI with the intensity below the threshold of the tendon(T)-reflex were delivered. Early and significant peaks in EMG-A were produced by ES-UN, MS-HTM, and MS-FDI in eight of eight subjects. The mean amplitudes of the peaks by ES-UN, MS-HTM, and MS-FDI were, respectively, 121.9%, 139.3%, and 149.9% of the control EMG (100%). The difference between latencies of the peaks by ES-UN and MS-HTM, and ES-UN and MS-FDI was almost equivalent to that of the Hoffmann(H)- and T-reflexes of HTM and FDI, respectively. The peaks by ES-UN, MS-HTM, and MS-FDI diminished with tonic vibration stimulation (TVS) to HTM and FDI, respectively. These findings suggest that group Ia afferents of the hand muscles facilitate the ECR motoneurone pool.
Authors:
Katsuhiko Suzuki; Keiichi Ogawa; Toshiaki Sato; Haruki Nakano; Hiromi Fujii; Masaomi Shindo; Akira Naito
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society     Volume:  29     ISSN:  1537-1603     ISO Abbreviation:  J Clin Neurophysiol     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8506708     Medline TA:  J Clin Neurophysiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  472-476     Citation Subset:  -    
Affiliation:
*Department of Physical Therapy, Yamagata Prefectural University of Health Sciences, Yamagata, Japan †Department of Physiotherapy, Niigata College of Health Science, Niigata, Japan ‡Department of Occupational Therapy, Yamagata Prefectural University of Health Sciences, Yamagata, Japan §Department of Rehabilitation Medicine, Osaka Medical College, Osaka, Japan ‖Department of Health and Nutritional Science, Matsumoto University Faculty of Human Health Science, Matsumoto, Japan ¶Department of Anatomy and Structural Science, Yamagata University Faculty of Medicine, Yamagata, Japan.
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