For some of nation's young athletes, training may be too much of a good thing.
Cowart
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D000293:Adolescent; D000328:Adult; D001265:Athletic Injuries / Q000209:etiology*; D002648:Child; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D010806:Physical Education and Training / Q000379:methods; D014481:United States