Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Studies Question Health Benefit of Post-Exercise Meals

01.09.2008
Three studies published by kinesiology researchers at the University of Massachusetts Amherst suggest that, unless you are a competitive athlete, consuming sports drinks or high-carbohydrate foods such as energy bars right after exercising may negate the health benefits that physical exercise creates.

Barry S. Braun, associate professor of kinesiology and director of the Energy Metabolism laboratory at UMass Amherst, says most people who exercise aren’t competitive athletes. They exercise to help their overall health, seeking to manage their weight and reduce risk for diabetes, heart disease or other health problems. For them, the potent benefits of exercise are quickly reversed by consuming high-carbohydrate foods such as sports drinks and energy bars after workouts.

Braun says for ordinary people who are using physical activity to improve their health, exercise is a medicine. Each “dose” of exercise gives benefits but the effects are lost in one to two days. Like other medications, exercise also has interactions with food. Recommendations for athletes seeking to optimize their performance may be precisely the wrong advice for people using exercise to improve their health. The latter might be wiser to avoid sports drinks and energy bars during, and for one to three hours following, exercise to maximize the positive effects of each exercise “dose,” Braun says.

In three recently published studies, graduate students under Braun’s direction looked at how the total calories, the carbohydrate content, and the timing of post-exercise meals influence metabolic health. In the first study, published in the Journal of Applied Physiology, Steve Black showed that walking on a treadmill for one hour daily, which burned 500 calories, increased the effectiveness of insulin to clear blood sugar by 40 percent. But when the 500 calories burned was replaced by feeding the participants a high-carbohydrate drink following exercise, the positive effect disappeared entirely, along with improvements in several other key health markers like blood lipids and inflammatory proteins.

To understand whether the negative effects of the post-exercise meal were due to the total calories or to the carbohydrate content of the meal, Kaila Holtz tested two different meals given immediately after 75 minutes of moderately intense bicycle exercise. The meals contained exactly the same amount of calories but one was high in carbohydrates and the other was very low in carbohydrates. Her results, published in the Journal of Applied Physiology, Nutrition and Metabolism, showed that the effectiveness of insulin to clear sugar from the blood was greater after either exercise/meal combination compared to participants who did not exercise. The effects were larger, however, when the meal was low in carbohydrates. These results suggest that, when the post-exercise meal is low in carbohydrates, more of the metabolic benefits of exercise are retained.

Brooke Stephens-Hasson conducted a study, also published in the Journal of Applied Physiology, Nutrition and Metabolism, in which she changed the timing of when the meal was given while keeping the total calories and carbohydrate content of each meal constant. She compared identical meals given before, immediately after, or three hours after 75 minutes of moderately intense bicycling. Once again, the effectiveness of insulin to clear blood sugar was better after any of the exercise conditions compared to a no-exercise condition. Although there were a few subtle differences, the results were similar among all three exercise/meal combinations, suggesting that timing of the meals was not an important consideration.

Barry S. Braun | Newswise Science News
Further information:
http://www.umass.edu

More articles from Studies and Analyses:

nachricht Researchers simplify tiny structures' construction drip by drip
12.11.2018 | Princeton University, Engineering School

nachricht Mandibular movement monitoring may help improve oral sleep apnea devices
06.11.2018 | Elsevier

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: UNH scientists help provide first-ever views of elusive energy explosion

Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.

Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...

Im Focus: A Chip with Blood Vessels

Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.

Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...

Im Focus: A Leap Into Quantum Technology

Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.

In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...

Im Focus: Research icebreaker Polarstern begins the Antarctic season

What does it look like below the ice shelf of the calved massive iceberg A68?

On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.

Im Focus: Penn engineers develop ultrathin, ultralight 'nanocardboard'

When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure

Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“3rd Conference on Laser Polishing – LaP 2018” Attracts International Experts and Users

09.11.2018 | Event News

On the brain’s ability to find the right direction

06.11.2018 | Event News

European Space Talks: Weltraumschrott – eine Gefahr für die Gesellschaft?

23.10.2018 | Event News

 
Latest News

Purdue cancer identity technology makes it easier to find a tumor's 'address'

16.11.2018 | Health and Medicine

Good preparation is half the digestion

16.11.2018 | Life Sciences

Microscope measures muscle weakness

16.11.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>