Abstract
Background
Emerging evidence suggests that higher circulating levels of inflammatory biomarkers in blood are associated with higher negative affect (NA) and lower positive affect (PA). To our knowledge, the unique associations between NA and PA in daily life and salivary biomarkers of inflammation have not been examined. This study examined these associations in young adults.
Methods
Measures of NA and PA were created from aggregated daily measures of affect (morning and evening ratings averaged across 14 days). We investigated associations between these measures and salivary C-reactive protein (CRP) and interleukin (IL)-6 in a sample of 108 young adults (60% female, mean age = 20.45 ± 1.47), a subset of whom had self-reported chronic back pain (n = 49). CRP and IL-6 were determined from saliva obtained at the end of the daily diary period.
Results
After covarying for age, gender, body mass index, chronic pain status, salivary flow rate, and NA, higher PA was associated with lower salivary CRP (β = − 0.02, 95% CI (− 0.03, − 0.00) sr2 = .06, p = .01) but not IL-6; removing NA from this model did not change results. In a model with the same covariates (and PA), NA was not significantly related to CRP or IL-6. Chronic back pain status and gender did not moderate results.
Conclusions
Findings suggest that higher PA may be associated with lower salivary CRP in young adults, even after accounting for NA and demographic characteristics. Findings highlight the utility of assessing emotional states in relation to salivary markers of inflammation in future biobehavioral research.
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Acknowledgments
The authors would like to thank Matthew Ulrich for his assistance running the inflammatory assays.
Funding
This study was funded in part by the Social Science Research Institute at the Penn State University (PI: Graham-Engeland). Jones was supported by National Institutes of Aging T32AG049676 to the Pennsylvania State University. Song was supported by the National Research Foundation of Korea’s Brain Korea 21 PLUS (Embodiment: Health and Society Interaction) to Korea University.
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Slavish, D.C., Jones, D.R., Smyth, J.M. et al. Positive and Negative Affect and Salivary Markers of Inflammation Among Young Adults. Int.J. Behav. Med. 27, 282–293 (2020). https://doi.org/10.1007/s12529-019-09795-2
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DOI: https://doi.org/10.1007/s12529-019-09795-2