Abstract
Based on the theoretical foundations of the caregiving system model, which holds that prosocial behavior can be conceptualized in relation to a neurobiological stress-buffering mechanism, we addressed the question of whether daily volunteering yields buffering effects in terms of suppressing a neuroendocrine response to daily stressors. Using daily diary data from the Midlife in the United States II study, we analyzed a sample of middle-aged and older volunteers (N=340) to test the buffering role of daily volunteer work for the same day stressors-salivary cortisol response relationship. Findings indicated that the relationship between daily stressors and cortisol output was attenuated on days when respondents volunteered compared to days when they did not volunteer. Our findings are suggestive of a unique neurobiological mechanism underlying the link between volunteering and better health. Volunteer programs designed to help others in need may be considered as an intervention strategy for individuals living under stressful conditions.