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BYU study: Exercise may affect food motivation
Date:9/12/2012

It is commonly assumed that you can "work up an appetite" with a vigorous workout. Turns out that theory may not be completely accurate at least immediately following exercise.

New research out of BYU shows that 45 minutes of moderate-to-vigorous exercise in the morning actually reduces a person's motivation for food.

Professors James LeCheminant and Michael Larson measured the neural activity of 35 women while they viewed food images, both following a morning of exercise and a morning without exercise. They found their attentional response to the food pictures decreased after the brisk workout.

"This study provides evidence that exercise not only affects energy output, but it also may affect how people respond to food cues," LeCheminant said.

The study, published online, ahead of print in the October issue of Medicine & Science in Sports & Exercise, measured the food motivation of 18 normal-weight women and 17 clinically obese women over two separate days.

On the first day, each woman briskly walked on a treadmill for 45 minutes and then, within the hour, had their brain waves measured. Electrodes were attached to each participant's scalp and an EEG machine then measured their neural activity while they looked at 240 images 120 of plated food meals and 120 of flowers. (Flowers served as a control.)

The same experiment was conducted one week later on the same day of the week and at the same time of the morning, but omitted the exercise. Individuals also recorded their food consumption and physical activity on the experiment days.

The 45-minute exercise bout not only produced lower brain responses to the food images, but also resulted in an increase in total physical activity that day, regardless of body mass index.

"We wanted to see if obesity influenced food motivation, but it didn't," LeCheminant said. "However, it was clear that the exercise bout was playing a role
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Contact: Todd Hollingshead
toddh@byu.edu
801-422-8373
Brigham Young University
Source:Eurekalert  

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