Exercise, health links need hard proof, say researchers studying mechanisms.
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D000328:Adult; D000368:Aged; D000568:Amenorrhea / Q000209:etiology; D015519:Bone Density; D004644:Emotions; D015444:Exercise; D005260:Female; D006801:Humans; D008875:Middle Aged; D010024:Osteoporosis / Q000517:prevention & control