Featured Research

from universities, journals, and other organizations

Amount of physical activity needed to prevent long-term weight gain

Date:
April 20, 2010
Source:
JAMA and Archives Journals
Summary:
Among women consuming a usual diet, physical activity was associated with less weight gain over 13 years only among women of normal weight, according to a new study. The researchers also found that women successful in maintaining normal weight averaged approximately 60 minutes a day of moderate-intensity activity throughout the study.

Among women consuming a usual diet, physical activity was associated with less weight gain over 13 years only among women of normal weight, according to a new study. The researchers also found that women successful in maintaining normal weight averaged approximately 60 minutes a day of moderate-intensity activity throughout the study.

The prevalence of overweight and obesity in the United States has increased dramatically over the past 2 decades, with 1 in 3 adults currently obese. "Because the average U.S. adult gains weight with age, developing ways to prevent unhealthful weight gain would help them avoid having to lose weight and then trying to maintain that loss. Compared with the vast body of research on the treatment of overweight and obese individuals, little research exists on preventing weight gain," the authors write. "The amount of physical activity needed to prevent long-term weight gain is unclear."

I-Min Lee, M.B.B.S., Sc.D., of Brigham and Women's Hospital and Harvard Medical School, Boston, and colleagues examined weight changes associated with different physical activity levels in a study that included 34,079 healthy U.S. women who consumed a usual diet (average age, 54 years) from 1992-2007. At the beginning of the study and at years 3, 6, 8, 10, 12 and 13, women reported their physical activity and body weight. Women were classified as expending less than 7.5, 7.5 to less than 21, and 21 or more metabolic equivalent (MET) hours per week of activity at each time. Analyses examined physical activity and weight change over intervals averaging 3 years.

Women gained an average of 5.7 lbs. throughout the study. Compared with women expending 21 or more MET hours per week, those expending 7.5 to less than 21 MET hours per week gained .2 lbs., whereas those expending less than 7.5 MET hours per week gained .3 lbs, a difference that was not statistically significant.

"There was a significant interaction with body mass index (BMI), such that there was an inverse dose-response relation between activity levels and weight gain among women with a BMI of less than 25 but no relation among women with a BMI from 25 to 29.9 or with a BMI of 30.0 or higher. A total of 4,540 women (13.3 percent) with a BMI lower than 25 at study start successfully maintained their weight by gaining less than 5.1 lbs. throughout. Their [average] activity level over the study was 21.5 MET hours per week ([approximately] 60 minutes a day of moderate-intensity activity)," the researchers write.

"These data suggest that the 2008 federal recommendation for 150 minutes per week, while clearly sufficient to lower the risks of chronic diseases, is insufficient for weight gain prevention absent caloric restriction. Physical activity was inversely related to weight gain only among normal-weight women; among heavier women, there was no relation, emphasizing the importance of controlling caloric intake for weight maintenance in this group."


Story Source:

The above story is based on materials provided by JAMA and Archives Journals. Note: Materials may be edited for content and length.


Journal Reference:

  1. I-Min Lee; Luc Djousse; Howard D. Sesso; Lu Wang; Julie E. Buring. Physical Activity and Weight Gain Prevention. JAMA, 2010;303(12):1173-1179

Cite This Page:

JAMA and Archives Journals. "Amount of physical activity needed to prevent long-term weight gain." ScienceDaily. ScienceDaily, 20 April 2010. <www.sciencedaily.com/releases/2010/03/100323161452.htm>.
JAMA and Archives Journals. (2010, April 20). Amount of physical activity needed to prevent long-term weight gain. ScienceDaily. Retrieved April 18, 2014 from www.sciencedaily.com/releases/2010/03/100323161452.htm
JAMA and Archives Journals. "Amount of physical activity needed to prevent long-term weight gain." ScienceDaily. www.sciencedaily.com/releases/2010/03/100323161452.htm (accessed April 18, 2014).

Share This



More Health & Medicine News

Friday, April 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Obama: 8 Million Healthcare Signups

Obama: 8 Million Healthcare Signups

AP (Apr. 17, 2014) President Barack Obama gave a briefing Thursday announcing 8 million people have signed up under the Affordable Care Act. He blasted continued Republican efforts to repeal the law. (April 17) Video provided by AP
Powered by NewsLook.com
Is Apathy A Sign Of A Shrinking Brain?

Is Apathy A Sign Of A Shrinking Brain?

Newsy (Apr. 17, 2014) A recent study links apathetic feelings to a smaller brain. Researchers say the results indicate a need for apathy screening for at-risk seniors. Video provided by Newsy
Powered by NewsLook.com
Could Even Casual Marijuana Use Alter Your Brain?

Could Even Casual Marijuana Use Alter Your Brain?

Newsy (Apr. 16, 2014) A new study conducted by researchers at Northwestern and Harvard suggests even casual marijuana use can alter your brain. Video provided by Newsy
Powered by NewsLook.com
Thousands Of Vials Of SARS Virus Go Missing

Thousands Of Vials Of SARS Virus Go Missing

Newsy (Apr. 16, 2014) A research institute in Paris somehow misplaced more than 2,000 vials of the deadly SARS virus. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins