30 minutes is not enough - middle-aged need full hour of exercise to avoid gaining weight as they age

Prticipation in sport is associated with a with a 20—40% reduction in all-cause mortality compared with non-participation. Exercise might also be considered as a fifth vital sign, according to the Lancet: http://goo.gl/gyxYf

Middle-aged women need to get at least an hour a day of moderate exercise if they hope to ward off the creep of extra pounds that comes with aging.

According to JAMA, among women consuming a usual diet, physical activity was associated with less weight gain only among women whose BMI was lower than 25. Women successful in maintaining normal weight and gaining fewer than 2.3 kg over 13 years averaged approximately 60 minutes a day of moderate-intensity activity throughout the study.

Already, two-thirds of U.S. adults and nearly one in three children are overweight or obese.

Sheila Anderson, 50, works out at the fitness center three to four times a week, doing 45 minutes of cardiovascular training and a couple of hours a week of weight training.

"Does it strike me as too much?" she said of the finding. "Maybe. It sure is hard to fit in an hour each day. I could not come to the gym seven days a week," she said.

One hour per day of exercise is difficult to achieve. However, even 30 minutes is better than no exercise at all.



Dr. Michael Roizen, Cleveland Clinic Chief Wellness Officer, answers the question "How much exercise is enough?"

Three parts of exercise have been shown to be beneficial to health:

1. Moving the equivalent to 10,000 steps a day.
2. Resistance exercise for 30 minutes a week.
3. 20 minutes of cardiovascular exercise.

References:

Hour of exercise may be too much for busy U.S. women | Reuters.

JAMA 2010;303[12]:1173-1179