Exercise and dysmenorrhea in young teenagers: A 3-year study.
D000293:Adolescent; D004412:Dysmenorrhea / Q000517:prevention & control; D005260:Female; D006173:Gymnastics; D006801:Humans; D011293:Premenstrual Syndrome / Q000517:prevention & control; D011446:Prospective Studies; D013334:Students