Kramer, Volek et al.
Influence of exercise training on physiological and performance changes with weight loss in men.
Med. Sci. Sports Exerc., Vol. 31, No. 9, pp. 1320-1329, 1999.
Overweight subjects were assigned to three groups: diet-only, diet plus aerobics, diet plus aerobics plus weights. The diet group lost 14.6 pounds of fat in 12 weeks. The aerobic group lost only one more pound (15.6 pounds) than the diet group (training was three times a week starting at 30 minutes and progressing to 50 minutes over the 12 weeks).
The weight training group lost 21.1 pounds of fat (44% and 35% more than diet and aerobic only groups respectively). Basically, the addition of aerobic training didn’t result in any real world significant fat loss over dieting alone.
Thirty-six sessions of up to 50 minutes is a lot of work for one additional pound of fat loss. However, the addition of resistance training greatly accelerated fat loss results.
Bryner RW, Ullrich IH, Sauers J, Donley D, Hornsby G, Kolar M, Yeater R.
Effects of resistance vs. aerobic training combined with an 800 calorie liquid diet on lean body mass and resting ****bolic rate.
J Am Coll Nutr. 1999 Apr;18(2):115-21.
The aerobic group performed four hours of aerobics per week. The resistance training group performed 2-4 sets of 8-15 reps, 10 exercises, three times per week.
V02 max increased equally in both groups. Both groups lost weight. The resistance training group lost significantly more fat and didn’t lose any LBM, even at only 800 calories per day. (The reason the calories were so low was to really take any dietary variables completely out of the equation and compare the effects of the exercise regime on LBM and ****bolism.)