Morpak, Danika2021-06-132021-06-1320212021-06-13http://hdl.handle.net/1828/13034Previous research has indicated that markers of early life development (birth weight, age at first menstruation (menarche), and relative leg length) are predictors of adult body size and composition (adiposity and lean mass). The life history theory states that an individual distributes metabolic energy between four functions: reproduction, growth, maintenance, and immunity. The pace of growth and development and the way metabolic energy is allocated is significantly impacted by the markers of early life development. Females tend to allocate more energy into adiposity (fat mass) while males tend to allocate more into lean mass. My research looks at a sample of ultramarathon runners (n=71), including both males and females. I aim to determine (1) if there are relationships between markers of early life development and adult body size and composition; (2) if these relationships appear in ways predicted by the life history model; and (3) if males invest more or less into lean mass. I ran partial Pearson’s correlation analyses and linear regression analyses to investigate any relationships. Furthermore, I assess the impact that early life predictors of adult body size and composition may have in predicting individuals who are at a heightened risk of developing metabolic and/or cardiovascular diseases. I also consider the influence that socioeconomic status has on an individual’s access to preventative care and treatments.enHonours thesis