title: The effect of a four-month physical fitness program on high- and low-fit groups matched for age.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D006339:Heart Rate; D006801:Humans; D008055:Lipids / Q000097:blood; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption; D010806:Physical Education and Training; D010809:Physical Fitness; D013178:Sports Medicine
chemical_list: D008055:Lipids