Featured Research

from universities, journals, and other organizations

Reducing TV time helps adults burn more calories, study finds

Date:
December 15, 2009
Source:
JAMA and Archives Journals
Summary:
Adults who used an electronic lock-out system to reduce their television time by half did not change their calorie intake but did expend more energy over a three-week period, according to a new study.

Adults who used an electronic lock-out system to reduce their television time by half did not change their calorie intake but did expend more energy over a three-week period, according to a report in the December 14/28 issue of Archives of Internal Medicine, one of the JAMA/Archives journals.

The average adult watches almost five hours of television per day, according to background information in the article. Some efforts to prevent and reduce obesity have focused on modifying diet and physical activity, but newer strategies have involved reducing sedentary behaviors such as TV watching. Not only may reducing TV time allow time for more active endeavors, it may also help alleviate chronic sleep deprivation, potentially linked to obesity.

Jennifer J. Otten, Ph.D., R.D., then of the University of Vermont, Burlington, and now of Stanford University School of Medicine, Palo Alto, Calif., and colleagues conducted a randomized controlled trial of 36 adults who had a body mass index between 25 and 50 and reported watching at least three hours of TV per day. Between January and July 2008, all participants underwent a three-week observation period during which their daily TV time was assessed. A group of 20 individuals was then randomly assigned to receive an electronic device that shut off the TV after they had reached a weekly limit of 50 percent of their previously measured TV viewing time. An additional 16 participants served as a control group.

As assessed by an armband measuring physical activity, those with the lock-out systems burned 119 more calories per day during the three-week period. In comparison, the control group burned 95 fewer calories per day during the intervention than during the observation period. Energy balance -- the comparison of calories consumed to calories burned -- was negative in the intervention group (who consumed 244 calories less than they burned each day) but positive in the control group (who consumed 57 more calories than they burned each day); however, this difference did not reach statistical significance.

"A recent task force report supports small behavior changes as a more sustainable, long-term approach to help address the obesity epidemic," the authors write. "It has been estimated that combined increases in energy expenditure and decreases in energy intake equaling only 100 calories per day could prevent the gradual weight gain observed in most of the population."

Previous research with children has found that screen time reductions reduce calories consumed but do not increase calories burned, producing a similar change in energy balance but through a different mechanism, the authors note. "This suggests that adults may differ from children in how they respond to reductions in sedentary behaviors," they conclude. "To our knowledge, this is the first study to measure the effects of a TV reduction intervention in adults. Reducing TV viewing should be further explored as a method to reduce and prevent obesity in adults."

This project was supported in part by USDA Hatch Act Funds and by grants from the National Institutes of Health.


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. Jennifer J. Otten; Katherine E. Jones; Benjamin Littenberg; Jean Harvey-Berino. Effects of Television Viewing Reduction on Energy Intake and Expenditure in Overweight and Obese Adults: A Randomized Controlled Trial. Arch Intern Med, 2009; 169 (22): 2109-2115 [link]

Cite This Page:

JAMA and Archives Journals. "Reducing TV time helps adults burn more calories, study finds." ScienceDaily. ScienceDaily, 15 December 2009. <www.sciencedaily.com/releases/2009/12/091214162324.htm>.
JAMA and Archives Journals. (2009, December 15). Reducing TV time helps adults burn more calories, study finds. ScienceDaily. Retrieved September 1, 2014 from www.sciencedaily.com/releases/2009/12/091214162324.htm
JAMA and Archives Journals. "Reducing TV time helps adults burn more calories, study finds." ScienceDaily. www.sciencedaily.com/releases/2009/12/091214162324.htm (accessed September 1, 2014).

Share This




More Health & Medicine News

Monday, September 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

We've Got Mites Living In Our Faces And So Do You

We've Got Mites Living In Our Faces And So Do You

Newsy (Aug. 30, 2014) A new study suggests 100 percent of adult humans (those over 18 years of age) have Demodex mites living in their faces. Video provided by Newsy
Powered by NewsLook.com
Liberia Continues Fight Against Ebola

Liberia Continues Fight Against Ebola

AFP (Aug. 30, 2014) Authorities in Liberia try to stem the spread of the Ebola epidemic by raising awareness and setting up sanitation units for people to wash their hands. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com
California Passes 'yes-Means-Yes' Campus Sexual Assault Bill

California Passes 'yes-Means-Yes' Campus Sexual Assault Bill

Reuters - US Online Video (Aug. 30, 2014) California lawmakers pass a bill requiring universities to adopt "affirmative consent" language in their definitions of consensual sex, part of a nationwide drive to curb sexual assault on campuses. Linda So reports. Video provided by Reuters
Powered by NewsLook.com
New Drug Could Reduce Cardiovascular Deaths

New Drug Could Reduce Cardiovascular Deaths

Newsy (Aug. 30, 2014) The new drug from Novartis could reduce cardiovascular deaths by 20 percent compared to other similar drugs. 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