Body Clocks - Coordination of Peripheral and Central Oscillators

For 28 days, women will wear devices to capture: ambient light exposure, lower limb biomechanics, sleep, oxygen saturation, heart rate, temperature, and gut physiology. Twice during the study, women will have saliva collected for 7 hours under dim light conditions in order to determine melatonin concentrations. During this 7-hour period, two blood draws for determination of proteomic profiles will also occur. Daily urine samples will be tested for LH until the presence of the LH surge to help identify menstrual phase.