Featured Research

from universities, journals, and other organizations

Decrease In Physical Activity May Not Be A Factor In Increased Obesity Rates Among Adolescents

Date:
November 3, 2009
Source:
Johns Hopkins University Bloomberg School of Public Health
Summary:
Decreased physical activity may have little to do with the recent spike in obesity rates among US adolescents, according to researchers.

Decreased physical activity may have little to do with the recent spike in obesity rates among U.S. adolescents, according to researchers at the Johns Hopkins Bloomberg School of Public Health.

Related Articles


Prompted by growing concern that the increase was due to decreased physical activity associated with increased TV viewing time and other sedentary behaviors, researchers examined the patterns and time trends in physical activity and sedentary behaviors among U.S. adolescents based on nationally representative data collected since 1991. The review found signs indicating that the physical activity among adolescents increased while TV viewing decreased in recent years.

The results are featured in the October 30 online issue of Obesity Reviews.

"Although only one third of U.S. adolescents met the recommended levels of physical activity, there is no clear evidence they had become less active over the past decade while the prevalence of obesity continued to rise," said Youfa Wang, MD, PhD, MS, senior author of the study and an associate professor with the Bloomberg School's Center for Human Nutrition and the Department of International Health. "During the recent decade, U.S. adolescents had greater access to TV, but significantly fewer of them watched TV for three or more hours per day. In addition, daily physical education attendance rates improved along with the use of physical education class in engaging in physical activity. However, there are considerable differences in the patterns by age, sex and ethnicity."

Wang, along with co-authors Shiru Li, MD, MS, former visiting scholar with the Bloomberg School's Center for Human Nutrition, and Margarita Treuth, PhD, adjunct associate professor with the Bloomberg School's Center for Human Nutrition and a professor with the University of Maryland East Shore, examined findings from the nationally representative Youth Risk Behavior Surveillance (YRBS) surveys from 1991 to 2007. The survey included U.S. high school students in grades 9 through 12 and provided information about their physical activities including enrollment and participation in physical education in school and sedentary behaviors including screen time.

Based on these surveys, researchers examined the patterns and time trends and compared the observed physical activity patterns with the national goals set in Healthy People 2010, a comprehensive agenda for improving the health of all Americans. They found that minority students were less likely to be physically active and more likely to engage in sedentary behaviors than white students. Girls were less active than boys and decreased physical activity was related to an increase in age.

"The large gaps between the 2007 achievement and the 2010 targets indicate that the goals are unlikely to be achieved by 2010," said Wang. "Our study suggests that more vigorous efforts are needed to help young Americans engage in adequate regular physical activity and reduce sedentary behaviors, which will help promote good health. In addition, these findings may suggest factors other than physical activity, and sedentary behaviors such as unhealthy eating may play a more important role to help explain the recent increase in obesity."

The research was supported in part by research grants from The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) and The Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD).


Story Source:

The above story is based on materials provided by Johns Hopkins University Bloomberg School of Public Health. Note: Materials may be edited for content and length.


Journal Reference:

  1. S. Li, M.S. Treuth and Y. Wang. How active are American adolescents and have they become less active? Obesity Reviews, 2009; DOI: 10.1111/j.1467-789X.2009.00685.x

Cite This Page:

Johns Hopkins University Bloomberg School of Public Health. "Decrease In Physical Activity May Not Be A Factor In Increased Obesity Rates Among Adolescents." ScienceDaily. ScienceDaily, 3 November 2009. <www.sciencedaily.com/releases/2009/11/091102171714.htm>.
Johns Hopkins University Bloomberg School of Public Health. (2009, November 3). Decrease In Physical Activity May Not Be A Factor In Increased Obesity Rates Among Adolescents. ScienceDaily. Retrieved November 27, 2014 from www.sciencedaily.com/releases/2009/11/091102171714.htm
Johns Hopkins University Bloomberg School of Public Health. "Decrease In Physical Activity May Not Be A Factor In Increased Obesity Rates Among Adolescents." ScienceDaily. www.sciencedaily.com/releases/2009/11/091102171714.htm (accessed November 27, 2014).

Share This


More From ScienceDaily



More Health & Medicine News

Thursday, November 27, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Ebola Leaves Orphans Alone in Sierra Leone

Ebola Leaves Orphans Alone in Sierra Leone

AFP (Nov. 27, 2014) — The Ebola epidemic sweeping Sierra Leone is having a profound effect on the country's children, many of whom have been left without any family members to support them. Duration: 01:02 Video provided by AFP
Powered by NewsLook.com
Experimental Ebola Vaccine Shows Promise In Human Trial

Experimental Ebola Vaccine Shows Promise In Human Trial

Newsy (Nov. 27, 2014) — A recent test of a prototype Ebola vaccine generated an immune response to the disease in subjects. Video provided by Newsy
Powered by NewsLook.com
Pet Dogs to Be Used in Anti-Ageing Trial

Pet Dogs to Be Used in Anti-Ageing Trial

Reuters - Innovations Video Online (Nov. 26, 2014) — Researchers in the United States are preparing to discover whether a drug commonly used in human organ transplants can extend the lifespan and health quality of pet dogs. Video provided by Reuters
Powered by NewsLook.com
Today's Prostheses Are More Capable Than Ever

Today's Prostheses Are More Capable Than Ever

Newsy (Nov. 26, 2014) — Advances in prosthetics are making replacement body parts stronger and more lifelike than they’ve ever been. 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:

Strange & Offbeat Stories

 

Health & Medicine

Mind & Brain

Living & Well

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