The acute effects of aerobic exercise on sensorimotor adaptation in chronic stroke.

BACKGROUND Sensorimotor adaptation, or the capacity to adapt movement to changes in the moving body or environment, is a form of motor learning that is important for functional independence (e.g., regaining stability after slips or trips). Aerobic exercise can acutely improve many forms of motor learning in healthy adults. It is not known, however, whether acute aerobic exercise has similar positive effects on sensorimotor adaptation in stroke survivors as it does in healthy individuals. OBJECTIVE The aim of this study was to determine whether acute aerobic exercise promotes sensorimotor adaptation in people post stroke. METHODS A single-blinded crossover study. Participants attended two separate sessions, completing an aerobic exercise intervention in one session and a resting control condition in the other session. Sensorimotor adaptation was assessed before and after each session, as was brain derived neurotrophic factor. Twenty participants with chronic stroke completed treadmill exercise at mod-high intensity for 30 minutes. RESULTS Acute aerobic exercise in chronic stroke survivors significantly increased sensorimotor adaptation from pre to post treadmill intervention. The 30-minute treadmill intervention resulted in an averaged 2.99 ng/ml increase in BDNF levels (BDNF pre-treadmill = 22.31 + /-2.85 ng/ml, post-treadmill was = 25.31 + /-2.46 pg/ml; t(16) = 2.146, p = 0.048, cohen's d = 0.521, moderate effect size). CONCLUSIONS These results indicate a potential role for aerobic exercise to promote the recovery of sensorimotor function in chronic stroke survivors.