Browsing by Autor "M. Katherine Sayre"

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    Physical activity mediates age differences in cognition among Tsimane forager-horticulturalists
    (Oxford University Press, 2025) Phoebe Imms; Nikhil N. Chaudhari; Daniel K. Cummings; Daniel Eid Rodríguez; Giuseppe Barisano; Paul L. Hooper; M. Katherine Sayre; Edmond Seabright; Randall C. Thompson; M. Linda Sutherland
    Among Tsimane males, who are more physically active than Tsimane females, the association between age and cognition via BV is significantly mediated by physical activity. Among Tsimane females, mediation occurs directly via physical activity, bypassing BV. These results suggest that mechanisms of cognitive differences across ages differ by sex and population. Studying the relationship between brain atrophy and lifestyle in nonindustrialized populations elucidates biological and environmental correlates of brain health.
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    Subjective well-being across the life course among non-industrialized populations
    (American Association for the Advancement of Science, 2024) Michael Gurven; Yoann Buoro; Daniel Eid Rodríguez; M. Katherine Sayre; Benjamin C. Trumble; Aili Pyhälä; Hillard Kaplan; Arild Angelsen; Jonathan Stieglitz; Victòria Reyes-García
    Subjective well-being (SWB) is often described as being U-shaped over adulthood, declining to a midlife slump and then improving thereafter. Improved SWB in later adulthood has been considered a paradox given age-related declines in health and social losses. While SWB has mostly been studied in high-income countries, it remains largely unexplored in rural subsistence populations lacking formal institutions that reliably promote social welfare. Here, we evaluate the age profile of SWB among three small-scale subsistence societies (<i>n</i> = 468; study 1), forest users from 23 low-income countries (<i>n</i> = 6987; study 2), and Tsimane' horticulturalists (<i>n</i> = 1872; study 3). Across multiple specifications, we find variability in SWB age profiles. In some cases, we find no age-related differences in SWB or even inverted U-shapes. Adjusting for confounders reduces observed age effects. Our findings highlight variability in average well-being trajectories over the life course. Ensuring successful aging will require a greater focus on cultural and socioecological determinants of individual trajectories.