Socioeconomic Status, Ecologically Assessed Social Activities, and Daily Cortisol Among Older Urban African Americans.

Objectives: Higher socioeconomic status (SES) individuals report more social activities than their lower SES counterparts. Yet, SES and racial health disparities are often confounded. Here, we tested whether the frequency of engagement in social activities contributed to the association between SES and daily cortisol secretion among urban African American older adults. Methods: Ninety-two community-dwelling African Americans aged 55 years and older reported what they were doing at regular intervals across the day on an Android smartphone for seven consecutive days. They also provided four saliva samples at four time points a day during the same period. Results: Higher SES older adults engaged in proportionally more social activities than their lower SES counterparts. A greater relative frequency of weekly social activities was associated with a steeper diurnal cortisol decline. Higher SES was indirectly linked to a steeper cortisol decline via increased relative frequency of weekly social activities. Discussion: Our findings suggest that engagement in weekly social activities represents a behavioral intermediary for SES health disparities in endocrine function among older urban African American adults.