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Study Shows Pre-teens Who
Lift Weights
Research
team finds that low-volume weight training Can an overweight girl lose her excess pounds with a
weight-lifting program alone? Probably not, the results of a recent study
show. Girls who participate in resistance training at school may get
stronger, but they may not lose weight as a result.
A research team, led by Margarita Treuth of Baylor College of Medicine in Houston, Texas, set out to test the theory that increasing an individual's energy expenditure would push metabolism to a rate that might contribute to weight loss. The results were published in the July 1998 issue of Medicine & Science in Sports & Exercise, the official journal of the American College of Sports Medicine. The purpose of the study was to determine the effects of a school-based, low-volume strength training program on strength, physical fitness, and energy expenditure in overweight young girls. Twelve healthy overweight girls between the ages of seven and ten years were recruited for the project, which was conducted at the University of Alabama in Birmingham. The project included measurement of their resting metabolic rate and a treadmill and muscle strength test to determine the baseline fitness of each individual. |
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The group participated in their physical education classes at school, and exercised three times a week under study conditions for five months with a low volume strength training protocol. At the end of the school year, they returned to the study center for a final assessment, along with a control group that had not exercised outside school. The researchers measured body composition, oxygen uptake and other respiratory rates to ascertain whether metabolism had changed as a result of exercise. They found that although strength parameters increased by approximately 20 percent, there was no concomitant increase in aerobic fitness parameters. After all training and measurements, the research team was unable to find any significant change in metabolic parameters that would indicate a higher metabolic rate in the group of girls who received the strength training. |
Based on their measurements in both the control group and the exercise group, Treuth and her associates concluded that such a strength training program will likely increase strength in the participants, but will not significantly increase energy expenditure.>
However, the strength training program used in this study effectively increased muscle strength in the overweight children. The methods they used did not provide evidence that metabolism was altered by the exercise program, but a more intensive resistance exercise program or one that combines aerobic exercise with strength training may increase metabolism and have a benefit on body composition in obese children. Treuth and her associates further concluded that future research should focus on aerobic exercise combined with strength training, which would be more likely to improve overall metabolism in obese children.
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