Placebo effect of an inert gel on experimentally induced leg muscle pain.

Hopker, James G. and Foad, A. and Beedie, C. and Coleman, Damian A and Leach, G. (2010) Placebo effect of an inert gel on experimentally induced leg muscle pain. Open Access Journal of Sports Medicine, 1 . pp. 215-221. ISSN 1179-1543. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.2147/OAJSM.S13564

Abstract

Purpose: This study examined the therapeutic effects of an inert placebo gel on experimentally induced muscle pain in a sports therapy setting. It aimed to investigate the degree to which conditioned analgesia, coupled with an expectation of intervention, was a factor in subsequent analgesia. Methods: Participants were sixteen male and eight female sports therapy students at a UK University. With institutional ethics board approval and following informed consent proce- dures, each was exposed to pain stimulus in the lower leg in five conditions, ie, conditioning, prebaseline, experimental (two placebo gel applications), and postbaseline. In conditioning trials, participants identified a level of pain stimulus equivalent to a perceived pain rating of 6/10. An inert placebo gel was then applied to the site with the explicit instruction that it was an analgesic. Participants were re-exposed to the pain stimulus, the level of which, without their knowledge, had been decreased, creating the impression of an analgesic effect resulting from the gel. In experimental conditions, the placebo gel was applied and the level of pain stimulus required to elicit a pain rating of 6/10 recorded. Results: Following application of the placebo gel, the level of pain stimulus required to elicit a pain rating of 6/10 increased by 8.2%. Application of the placebo gel significantly decreased participant’s perceptions of muscle pain (P = 0.001). Conclusion: Subjects’ experience and expectation of pain reduction may be major factors in the therapeutic process. These factors should be considered in the sports therapeutic environment.

Item Type: Article
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculties > Social Sciences > School of Sport and Exercise Studies
Depositing User: James Hopker
Date Deposited: 21 Jan 2011 09:35
Last Modified: 22 May 2014 11:40
Resource URI: http://kar.kent.ac.uk/id/eprint/26274 (The current URI for this page, for reference purposes)
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