Stress-Mediated Widespread Hypersensitivity in People with Irritable Bowel Syndrome: A Psychosomatic Approach

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dc.contributor.advisor Johnson, M en Simpson, Katrina en 2017-07-19T23:25:04Z en 2016 en
dc.identifier.uri en
dc.description Full text is available to authenticated members of The University of Auckland only. en
dc.description.abstract Irritable bowel syndrome (IBS) is a functional disorder with no clear organic pathology. Psychosocial factors, particularly stress, have been implicated in the aetiology and presentation. The biopsychosocial model of IBS demonstrates how psychosomatic processes occur along the braingut axis. It also provides a foundation for understanding how alterations to the brain-gut axis can evoke psychosomatic processes that underpin IBS. Research has identified how stress-mediated changes along the brain-gut axis are associated with visceral hypersensitivity in IBS. Other research has also demonstrated the presence of hypersensitivity in somatic structures. The aim of this study was to demonstrate stress-mediated effects on widespread hypersensitivity in a somatic structure. Impaired conditioned pain modulation, which may also exhibit stress-mediated effects, was also explored. The study sample comprised the IBS group which included 16 females aged 19 to 50 (M = 29.47, SD = 8.55) and the control group which included 20 females aged 18 to 55 (M = 28.24, SD = 12.08). The first stage of the method was a series of electric shocks to the forearm, with the addition of a cold pack to the contralateral forearm to test for conditioned pain modulation. Participants then completed a version of the Trier Social Stress Test. The third stage was a repeat of Stage One. Participants intermittently provided ratings of pain unpleasantness, pain intensity and stress. Heart rate was monitored continually. A series of mixed ANOVAS were used for statistical analysis. For stress-mediated hypersensitivity, there were no significant group differences for significant for pain unpleasantness ratings, F(1, 31) = 1.35, p = .254. However, they were marginally significant for pain intensity ratings, F(1, 32) = 4.06, p = .052, where IBS participants rated the pain slightly higher. There were no group differences in conditioned pain modulation both before, F(1, 33) = 1.45, p = .237 and after, F(1,23) = 3.42, p = .074 the Trier Social Stress Test. This study demonstrates some rudimentary evidence for IBS sufferers experiencing stress-mediated widespread hypersensitivity. Further research with interdisciplinary study designs such as this one are encouraged to continue to elucidate the psychosomatic aetiology and presentation of IBS. en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof Masters Thesis - University of Auckland en
dc.relation.isreferencedby UoA99264945505102091 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights Restricted Item. Available to authenticated members of The University of Auckland. en
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dc.title Stress-Mediated Widespread Hypersensitivity in People with Irritable Bowel Syndrome: A Psychosomatic Approach en
dc.type Thesis en Health Psychology en The University of Auckland en Masters en
dc.rights.holder Copyright: The author en
pubs.elements-id 638364 en
pubs.record-created-at-source-date 2017-07-20 en

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