title: Exercise, hypogonadism, and osteopenia.
mesh_terms: D000568:Amenorrhea / Q000150:complications*; D001847:Bone Diseases / Q000209:etiology*; D005260:Female; D006801:Humans; D007006:Hypogonadism / Q000150:complications*; D008297:Male; D005082:Physical Exertion