Experimental and quasi-experimental studies of physical activity for adolescent girls were eligible for inclusion, provided one of the main study aims was to increase physical activity in order to prevent or treat overweight or obesity. Studies were required to focus on girls aged 13 to 19 years and to report quantitative outcomes.
Most participants in the included studies were aged 12 to 17 years (range nine to 20 years). Most studies included participants from at least two ethnic groups; these included African-American, White, Hispanic, Asian, Pacific Island and/or Native American. More than half of the studies targeted specific populations such as obese, urban or sedentary adolescents. At least one study (the largest) compared schools rather than individuals. Study interventions included a variety of physical, cognitive, affective and environmental components (such as modified physical education classes, nutritional advice, assertiveness training and weekend retreats) with a teaching component in all cases. Intervention duration ranged from five weeks to two years (where reported). Most studies took place in a school setting; church, home and mixed settings were also used. Outcomes reported in the review included amount and frequency of physical activity, pedometer step count, heart health knowledge, self-concept, muscle mass, fitness and percentage body fat.
The author did not state how many reviewers selected the studies.