NDLI: Local subcutaneous and muscle pain impairs detection of passive movements at the human thumb

Content Provider	PubMed Central
Author	Weerakkody, N. S. Blouin, J. S. Taylor, J. L. Gandevia, S. C.
Copyright Year	2008
Abstract	Activity in both muscle spindle endings and cutaneous stretch receptors contributes to the sensation of joint movement. The present experiments assessed whether muscle pain and subcutaneous pain distort proprioception in humans. The ability to detect the direction of passive movements at the interphalangeal joint of the thumb was measured when pain was induced experimentally in four sites: the flexor pollicis longus (FPL), the subcutaneous tissue overlying this muscle, the flexor carpi radialis (FCR) muscle and the subcutaneous tissue distal to the metacarpophalangeal joint of thumb. Tests were conducted when pain was at a similar subjective intensity. There was no significant difference in the ability to detect flexion or extension under any painful or non-painful condition. The detection of movement was significantly impaired when pain was induced in the FPL muscle, but pain in the FCR, a nearby muscle that does not act on the thumb, had no effect. Subcutaneous pain also significantly impaired movement detection when initiated in skin overlying the thumb, but not in skin overlying the FPL muscle in the forearm. These findings suggest that while both muscle and skin pain can disturb the detection of the direction of movement, the impairment is site-specific and involves regions and tissues that have a proprioceptive role at the joint. Also, pain induced in FPL did not significantly increase the perceived size of the thumb. Proprioceptive mechanisms signalling perceived body size are less disturbed by a relevant muscle nociceptive input than those subserving movement detection. The results highlight the complex relationship between nociceptive inputs and their influence on proprioception and motor control.
Related Links	http://dx.doi.org/10.1113/jphysiol.2008.152942
Starting Page	3183
File Format	PDF
ISSN	14697793
e-ISSN	14697793
Journal	The Journal of Physiology
Issue Number	Pt 13
Volume Number	586
Language	English
Publisher	Blackwell Science Inc
Publisher Date	2008-07-01
Access Restriction	Open
Rights Holder	Blackwell Science Inc
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology Sports Science

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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