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The effect of experimentally induced sedentariness on mood and psychobiological responses to mental stress.

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posted on 22.10.2015 by Romano Endrighi, Andrew Steptoe, Mark Hamer
Background Evidence suggests a link between sedentary behaviours and depressive symptoms. Mechanisms underlying this relationship are not understood, but inflammatory processes may be involved. Autonomic and inflammatory responses to stress may be heightened in sedentary individuals contributing to risk, but no study has experimentally investigated this. Aim To examine the effect of sedentary time on mood and stress responses using an experimental design. Method Forty-three individuals were assigned to a free-living sedentary condition and to a control condition (usual activity) in a cross-over, randomised fashion and were tested in a psychophysiology laboratory after spending 2 weeks in each condition. Participants completed mood questionnaires (General Health Questionnaire and Profile of Mood States) and wore a motion sensor for 4 weeks. Results Sedentary time increased by an average of 32 min/day (P = 0.01) during the experimental condition compared with control. Being sedentary resulted in increases in negative mood independent of changes in moderate to vigorous physical activity (ΔGHQ = 6.23, ΔPOMS = 2.80). Mood disturbances were associated with greater stress-induced inflammatory interleukin-6 (IL-6) responses (β = 0.37). Conclusion Two weeks of exposure to greater free-living sedentary time resulted in mood disturbances independent of reduction in physical activity. Stress-induced IL-6 responses were associated with changes in mood.

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  • Sport, Exercise and Health Sciences

Published in

British Journal of Psychiatry

Citation

ENDRIGHI, R., STEPTOE, A. and HAMER, M., 2015. The effect of experimentally induced sedentariness on mood and psychobiological responses to mental stress. British Journal of Psychiatry, 207(4).

Publisher

© Royal College of Psychiatrists

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VoR (Version of Record)

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This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Publication date

2015

Notes

This is an Open Access Article. It is published by The Royal College of Psychiatrists under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

ISSN

0007-1250

Language

en

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