The Times reports on a new study of diet and exercise:
Teenagers and Weight Loss
Teenagers trying to lose weight should engage in an exercise program that includes both aerobic and resistance training, a randomized trial has found. It also found that diet without exercise accomplishes little.
Canadian researchers put 304 obese teenagers on a diet with a daily energy deficit of 250 calories (measured from their resting energy expenditure). Then they assigned them randomly to one of four groups for 22 weeks: aerobic training on exercise machines like treadmills, resistance exercise using weight machines and free weights, combined aerobic and resistance training, and a diet-only group with no exercise. The study appeared in JAMA Pediatrics.
Aerobic exercise is usually recommended, but the lead author, Dr. Ronald J. Sigal, a professor of medicine at Calgary University in Alberta, said it is clear that “those who did both resistance and aerobic exercise had significantly more fat loss and decreased waist size than those who did aerobic exercise alone.”
The abstract includes the statistical confidence intervals, which indicate this conclusion is not cast in stone. Nonetheless, cardio is losing ground to iron. Mark Sisson, Mark Rippetoe, and Crossfitters everywhere will nod.