Just six months of yoga significantly reduces fatigue in people with multiple sclerosis, but it has no effect on alertness and cognitive function, says a new Oregon Health & Science University study. The study, published June 8 in the journal Neurology, found that yoga is as good as a traditional aerobic exercise program in improving measures of fatigue, a common and potentially disabling symptom of MS. It was the first randomized, controlled trial of yoga in people with MS.