I am interested in bone health in women of reproductive age. I focus on how physical activity and estrogen interact to affect bone in healthy adult women. I measure both bone density (which changes slowly) and biological markers of bone turnover.  Bone is broken down and rebuilt all the time in order to keep it healthy, and the bone turnover markers allow me to see how much building and dissolving is happening at the present time in women. Overall, my goal is to understand how normal women maintain their bones during their entire life.