title: Sympathetic activity and aging: relationship to smoking habits, physical fitness, blood volume, and intracellular signalling.
mesh_terms: D000293:Adolescent; D000368:Aged; D000375:Aging / Q000502:physiology*; D001810:Blood Volume; D006184:Habits; D006801:Humans; D008297:Male; D010809:Physical Fitness; D012016:Reference Values; D015398:Signal Transduction / Q000502:physiology*; D012907:Smoking / Q000503:physiopathology*; D013564:Sympathetic Nervous System / Q000502:physiology*