If you're trying to shed a few pounds, a new study finds that short micro-bursts of activity throughout the day can make a big impact.
In a new study published September 1 in the American Journal of Health Promotion, University of Utah researchers found that even brief episodes of physical activity of high intensity - such as carrying a load of laundry or taking a flight of stairs - worked just as well as longer 10-minute bouts.
"What we learned is that for preventing weight gain, the intensity of the activity matters more than duration," says researcher Jessie X. Fan, professor of family and consumer studies. "Knowing that even short bouts of 'brisk' activity can add up to a positive effect is an encouraging message for promoting better health."
Researchers used data from more than 4,500 men and women who participated in the National Health and Nutrition Examination Survey. In the survey, participants wore accelerometers for seven days, which captured data on their physical activity. Researchers then compared measurements of physical activity based on length of time and intensity. Four categories were created: higher-intensity bouts (greater than 10 minutes exertion at greater than 2,020 counts per minutes, or CPM), higher-intensity short bouts (less than 10 minutes at greater than 2,020 CPM), lower-intensity long bouts (greater than 10 minutes and less than 2,019 CPM), and lower-intensity short bouts (less than 10 minutes and less than 2,019 CPM).
The study used body mass index, BMI, to measure weight status with results showing that for women, each daily minute spent in higher-intensity short bouts was related to a decrease of .07 BMI (A BMI between 18.5 and 24.9 is considered normal weight, whereas a BMI between 25 and 29.9 is overweight; and over 30 is obese.) Looking at it another way, each such minute offset the calorie equivalent of .41 pounds (.18 kilos). Men had similar results, the researchers said.
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