Endurance training for middle-aged men.
D000328:Adult; D000367:Age Factors; D000368:Aged; D005081:Exercise Therapy; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption; D010806:Physical Education and Training / Q000592:standards*; D013178:Sports Medicine