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Moderating effects of moderate-intensity physical activity in the relationship between depressive symptoms and interleukin-6 in primary care patients.

Abstract：

OBJECTIVE:To determine whether the relationship between interleukin (IL)-6 and depressive symptoms is moderated by participation in moderate-intensity physical activity in a sample of primary care patients. Elevated inflammation has been associated with a number of poor health outcomes. Depressive symptoms may be related to higher levels of the inflammatory marker IL-6; however, previous findings are inconsistent, possibly due to unidentified moderating factors. METHODS:A total of 107 participants, aged ≥ 40 years, were recruited in Rochester, New York, in 2006 to 2007. Depressive symptoms were measured by the Center for Epidemiologic Studies Depression Scale-Revised, participation in moderate-intensity physical activity was measured using a modified version of the Community Health Activities Model Program for Seniors Activity Questionnaire for Older Adults, and serum IL-6 concentrations were determined using standard enzyme-linked immunosorbent assay protocols and high-sensitivity, anti-cytokine antibody pairs. A hierarchical multiple regression analysis was conducted. RESULTS:The correlation between IL-6 and depressive symptoms was nonsignificant (r = .086, p = .40). The association between IL-6 and depressive symptoms was moderated by participation in moderate-intensity physical activity (p = .02). Among those who did not engage in moderate-intensity physical activity, higher levels of depressive symptoms were significantly associated with higher levels of IL-6 (r = .28, p = .05), whereas this association was not significant among those who did participate in moderate-intensity physical activity (r = -.13, p = .38). CONCLUSION:Participation in moderate-intensity physical activity may buffer the risk of higher inflammation often associated with higher levels of depressive symptoms.

journal_name

Psychosom Med

journal_title

Psychosomatic medicine

authors

Rethorst CD,Moynihan J,Lyness JM,Heffner KL,Chapman BP

doi

10.1097/PSY.0b013e3182108412

subject

Has Abstract

pub_date

2011-04-01 00:00:00

pages

265-9

issue

eissn

0033-3174

issn

1534-7796

pii

PSY.0b013e3182108412

journal_volume

pub_type

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Moderating effects of moderate-intensity physical activity in the relationship between depressive symptoms and interleukin-6 in primary care patients.