Psychological effects of intensive training in young athletes.
D000124:Achievement; D000223:Adaptation, Psychological; D000342:Affective Symptoms / Q000523:psychology; D000856:Anorexia Nervosa / Q000523:psychology; D001265:Athletic Injuries / Q000523:psychology; D002648:Child; D005260:Female; D005783:Gender Identity; D006801:Humans; D008297:Male; D010379:Peer Group; D010806:Physical Education and Training; D010809:Physical Fitness; D013177:Sports