A concussion is one of the most complex injuries in sports and can have potentially catastrophic results if not treated correctly. The central nervous system (CNS) integrates visual, proprioceptive, and vestibular sensory information to maintain balance during all movements. Ample clinical evidence exists that a concussion disrupts normal function of the CNS and results in postural instability. However, the long-term effects of concussion on balance control, particularly during dynamic functional movements, are not clear. PURPOSE: To determine the effects of concussion history on the kinematics of athletes performing dynamic balance tasks on dynamic balance on athletes. METHODS: Division I athletes without (n=5; 20.0±1.0 yrs) and with a history of concussion (n=5; 19.4±0.9 yrs 1.5±1.2 yrs post injury) performed dynamic balance tasks including gait, gait while stepping over an obstacle, get up and go (GUG), and GUG with a dual task. Speed was recorded for each task, and straightness of trajectory was calculated for normal gait and stepping over an obstacle as a root mean square (RMS) of the mediolateral deviation of the pelvis trajectory from a straight line. Cohen’s d effect sizes between groups were bootstrapped given the small sample size. Effect sizes greater than 0.8 were considered large, 0.5-0.8 moderate, and less than 0.5 as no effect. RESULTS: Athletes with history of concussion performed the dual task GUG 1.7 m/s slower than the control (large effect size: d=0.90). In addition, those with history of concussion performed normal gait with an RMS deviation of 30.9 cm compared to 25.1 cm in control (mod effect size: d=0.66) when instructed to maintain a straight trajectory. No effect of concussion history occurred for normal gait speed, speed of stepping over an obstacle, speed of GUG without dual task, or mediolateral deviation when stepping over an obstacle. CONCLUSIONS: Deficits in dynamic balance control during functional movements in Division I athletes were evident even as long as 1.5 years following concussion event. These data are part of a large prospective investigation (current enrollment: n=207), and athletes who sustain a concussion over the course of the study will be re-evaluated at regular intervals to observe changes in postural control during recovery.