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Moderate-intensity exercise causes weight loss, fat loss in men, weight maintenance in women
Friday, June 04, 2004 3:34 pm Email this article
Moderate-intensity exercise causes men to lose bodyweight and bodyfat, and helps women prevent weight gain according to a study from the University of Kansas.
MEN LOST 10.8 LBS OF FAT, 11.4 LBS OF WEIGHT, REDUCED BMI 1.6 UNITS
After a year-and-four-months, men in the exercise group had lost an average of 10.8 pounds of bodyfat, 11.4 pounds of bodyweight, and reduced their body mass index (BMI) by 1.6 units compared to controls who remained sedentary.
Belly fat decreased by an average of 23 percent in the men in the exercise group.
There was no significant difference in muscle mass between the groups at the end of the study.
WOMEN LOST 0.7 LBS BODYFAT, GAINED 1.3 LBS BODYWEIGHT VS 4.6 LBS INCREASE IN BODYFAT, 6.4 LBS WEIGHT GAIN IN CONTROLS
Women in the exercise group lost an average of 0.7 pounds of bodyfat compared to the control group who gained 4.6 pounds of bodyfat.
Belly fat was reduced by 5 percent in exercising women, whereas it increased by 5 percent in controls.
Women in the exercise group gained an average of 1.3 pounds of bodyweight compared to the control group who gained 6.4 pounds of bodyweight.
BMI increased an average of 0.1 units for women in the exercise group compared to an average increase of 1.1 units in the control group.
EXERCISE: 45 MINUTES, 5 TIMES PER WEEK, MINIMUM OF 2000 CALORIES PER WEEK
Exercise consisted primarily of walking on a motorized treadmill. However, alternate activities such as stationary biking and walking on stationary elliptical trainers were allowed for 1 of 5 days per week.
Exercise duration progressed from 20 minutes at baseline to 45 minutes at six months, and the intensity of exercise progressed from 60 percent of the heart rate reserve at baseline to 75 percent at six months.
This level of exercise corresponded to 55 to 70 percent of maximum oxygen consumption.
The minimum amount of exercise was approximately 400 caloriies per session, or 2000 calories per week.
MEN AVERAGED 667 CALORIES PER EXERCISE SESSION, WOMEN 439 CALORIES
At the end of the study, men were exercising an average of 667 calories per session, and women 439 calories per session.
NO DIETARY ADVICE GIVEN
Subjects were not given any dietary advice.
NO DIFFERENCE IN FOOD INTAKE IN EITHER GROUP
There were no significant difference in food intake between the groups or at the begining or end of the study.
The study started with 131 overweight or moderately obese people with a body mass index (BMI) of 25 to 35, who were 17- to 35-years-old.
In addition, all participants levels bodyfat were in the top 15 percent of people for their age and sex.
Two-third of patients (65 percent) were randomized to the exercise group to account for greater anticipated dropout rate, and the other third to the control group.
Seventy-four completed the study.
The control group remained sedentary and did not exceed 500 calories of physical activity per week, based on recall.
Participants who had a history of chronic disease (diabetes, heart disease, etc), elevated blood pressure (>140/90 mm Hg), elevated cholesterol >260 mg/dL, elevated triglycerides >500 mg/dL, or elevated fasting glucose levels (>140 mg/dL) were excluded.
In addition, participants were excluded if they smoked, took medications that would affect physical performance, such as beta blockers, or metabolism, such as thyroid hormone or corticosteroids, or if they lacked the ability to perform laboratory tests or to participate in moderate-intensity exercise.
The exercise was supervised, and the amount of calories burned during exercise was measured.
EXERCISE: 90 PERCENT OF SESSIONS ATTENDED
Both men and women attended 90 percent of the exercise sessions.
Donnelly J, Hill J, Jacobsen D, Potteiger J, Sullivan D, Johnson S, Heelan K, Hise M, Fennessey P, Sonko B, Sharp T, Jakicic J, Blair S, Tran Z, Mayo M, Gibson C, Washburn R. Effects of a 16-month randomized controlled exercise trial on body weight and composition in young, overweight men and women: the midwest exercise trial. Arch Intern Med. 2003 Jun 9, 163(11):1343-50.
Joseph E. Donnelly, EdD
Energy Balance Laboratory
Schiefelbusch Life Span Institute
University of Kansas
Lawrence, KS 66045, USA
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