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Benefits of school-based fitness programs fade after summer

A study of 17 middle school students suggests that physical fitness gains made by obese children who participated in a lifestyle-focused physical education class during the school year were lost after the three-month summer break, according to a report in the June issue of Archives of Pediatrics & Adolescent Medicine, one of the JAMA/Archives journals.

Children increasingly live in an environment with reduced amounts of physical activity coupled with easy access to calories, according to background information in the article. This can result in obesity, poor cardiovascular fitness, insulin resistance, type 2 diabetes, high cholesterol and hypertension.

Aaron L. Carrel, M.D., and colleagues at the University of Wisconsin Childrens Hospital, Madison, previously conducted a randomized controlled trial in which 17 overweight children were assigned to participate in a lifestyle-focused, fitness-oriented physical education class for nine months. At the end of the trial, students in the class achieved significant improvements in cardiovascular fitness and also had reduced fasting insulin levels, which indicate a lower risk for diabetes. For the new study, the same children (average age 12)all of whom remained at the same school and repeated the fitness classwere assessed again at the beginning and at the end of the next school year.

Improvements seen during the nine-month school-year intervention in cardiovascular fitness, fasting insulin levels and body composition were lost during the three-month summer break, the authors write. During the break, average fitness level as measured by maximum oxygen consumptionthe amount of oxygen the body can use, with higher levels indicating better fitnessdecreased by 3.2 milliliters per kilogram per minute. Percentage of body fat increased by an average of 1.3 percent, and fasting insulin levels also increased.

Developing and evaluating interventions to influence students opportunities for he
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Contact: Aaron Conklin
608-263-5561
JAMA and Archives Journals
4-Jun-2007


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