Serial Trainer

{July 31, 2008}   Exercise for Overweight Women

This comes from Medscape, a site that I visit because I’ll be attending Med School and I want to keep up on what’s new in the Medical Field. I take no credit for this article.

July 30, 2008 — In addition to limiting energy intake, overweight and obese women may need to exercise 55 minutes a day, 5 days per week, to sustain a weight loss of 10% during 2 years, according to the results of a study reported in the July 28 issue of the Archives of Internal Medicine.

“The importance of physical activity may be heightened in the maintenance of clinically significant weight loss,” write John M. Jakicic, PhD, from the University of Pittsburgh in Pennsylvania, and colleagues. “The consensus on recommendations for physical activity is a minimum of 30 minutes of moderate intensity activity on most days of the week, or 150 min/week. There is growing consensus that more exercise may be necessary to enhance long-term weight loss.”

Between December 1, 1999, and January 31, 2003, a total of 201 overweight and obese women with no contraindications to weight loss or physical activity were recruited from a hospital-based weight loss research center and randomly assigned to 1 of 4 behavioral weight loss intervention groups according to physical activity energy expenditure (1000 vs 2000 kcal/week) and intensity (moderate vs vigorous).

With a combination of in-person conversations and telephone calls during the 24-month study period, participants were also encouraged to reduce intake to 1200 to 1500 kcal/day. At baseline, body mass index was 27 to 40 kg/m2, and age range was 21 to 45 years.

The intervention groups did not differ significantly in weight loss at 6 months (8% – 10% of initial body weight) or 24 months (5% of initial body weight). Compared with individuals sustaining a weight loss of less than 10% of initial body weight, those sustaining a loss of 10% or more of initial body weight at 24 months reported performing more physical activity (1835 kcal/week or 275 minutes/week; P < .001), based on post hoc analysis.

“The addition of 275 minutes/week of physical activity, in combination with a reduction in energy intake, is important in allowing overweight women to sustain a weight loss of more than 10%,” the study authors write. “Interventions to facilitate this level of physical activity are needed.”

Limitations of this study include the amount of physical activity based on self-report and inability to examine the additive effect of different doses of physical activity above what could be achieved with diet alone.

In an accompanying commentary, Warren G. Thompson, MD, and James A. Levine, MD, PhD, from Mayo Clinic College of Medicine in Rochester, Minnesota, note that dieting is modestly effective for the short-term effect of obesity but that the long-term benefit is still unproven.

“Jakicic et al beautifully demonstrate that sustained weight loss requires the continued achievement of 2000 kcal/wk of physical activity,” Drs. Thompson and Levine write. “We believe that 2000 kcal/wk of physical activity can be achieved through a combination of strategies, including increased formal exercise, a modified work and school environment that allows for movement while working and learning, and a modified home environment with less television and more movement. Further research in sustainability of activity is urgently needed if we are to solve the obesity epidemic.”

The National Institutes of Health and the National Heart, Lung, and Blood Institute supported this study. Dr Jakicic is on the Scientific Advisory Board for BodyMedia, Inc, and the Calorie Control Council. Three of the study authors have obtained funding.

Dr. Levine, designer of the Walkstation, earns a royalty from Steelcase, Inc.

Arch Intern Med. 2008;168:1550-1559, 1559-1560.


theatldoc says:

Thanks for sharing the information.

Excellent article. I am a physician and I am considering utilizing the metabolic monitors that the authors used in my practice.

Good luck in Med School

Chukwuma I. Onyeije, M.D.
Atlanta Perinatal Associates

serialtrainer says:

Thank you Dr Onyeije. Glad to have you as an audience. Visit us often!

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