Abstract
This chapter reviews the use of saliva to assess age-related changes in important biological systems, describes how saliva can be used to assess naturally occurring fluctuations of biomarkers in adults’ daily lives, and offers cutting-edge statistical approaches that can help answer research questions that involve these multivariate and dynamic phenomena. This chapter highlights the use of saliva to assess day-to-day variability in biological markers across adulthood. Salivary biomarkers offer a unique and innovative window into investigating the daily experiences of midlife and older adults. Using findings from multiple daily diary studies where participants provide multiple saliva samples each day, we describe within-and across-day patterns of cortisol, dehydroepiandrosterone sulfate (DHEA-S), and salivary alpha-amylase (sAA). Using multilevel and latent state-trait modeling, we show differentiated patterns in each of these biomarkers across the day. Specific attention is paid to age differences in the daily patterning of these salivary biomarkers as well as their links to stressful events. The chapter also reviews recent research that links daily salivary biomarkers to long-term health and well-being. Recommendations for the design, collection, and statistical modeling of daily assessments of salivary biomarkers are also provided.
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Acknowledgments
Since 1995 the MIDUS study has been funded by the John D. and Catherine T. MacArthur Foundation Research Network, National Institute on Aging (P01-AG020166), and National Institute on Aging (U19-AG051426). Biomarker data collection was further supported by the NIH National Center for Advancing Translational Sciences’ (NCATS) Clinical and Translational Science Award (CTSA) program as “1UL1RR025011”. The Daily Stress and Health Study (DaSH) was funded by National Institute on Aging (R01AG031758).
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Almeida, D.M., Piazza, J., Liu, Y., Zarit, S.H. (2020). Use of Saliva to Better Understand the Daily Experience of Adulthood and Aging. In: Granger, D., Taylor, M. (eds) Salivary Bioscience. Springer, Cham. https://doi.org/10.1007/978-3-030-35784-9_27
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