title: The influence of body mass index on long-term fitness from physical education in adolescent girls.
abstract: BACKGROUND
  Physical education (PE) can improve physical fitness; however, little research has evaluated PE's long-term influence. The purpose is to determine PE's longitudinal effects on fitness in a group of adolescent girls and to determine whether body mass index (BMI) status influenced any potential effects.
  
  
  METHODS
  Participants were enrolled in daily PE throughout their ninth grade. Data were collected at baseline and at the end of 9th, 10th, and 11th grades. BMI (kg/m(2) ) was classified into Centers for Disease Control and Prevention percentiles. Fitness was estimated from a 3-stage step test (change in exercise heart rate (HR) indicated improved fitness) and analyzed using repeated measures general linear modeling with adjustments for baseline BMI, baseline age, ethnicity, intervention status, and moderate-to-vigorous physical activity outside PE.
  
  
  RESULTS
  Complete data were available for 131 girls (61% of sample) who were predominantly African American, 13.8 ± 0.4 years, mean BMI 24.7 ± 6.1 kg/m(2) at the ninth-grade baseline. Overall, stage 1 HR (bpm) decreased from baseline to 9th grade (-5.5 ± 1.3, p < 0.0001), baseline to 10th grade (-7.2 ± 1.4, p < 0.0001), and baseline to 11th grade (-7.0 ± 1.5, p < 0.0001). Change differed by BMI status; fitness improvement was significant for normal and overweight, but not obese girls. After 2 years, change in stage 1 HR (bpm) was significantly different between BMI categories: normal-weight girls versus obese girls (-10.0 ± 3.2, p = 0.002) and overweight girls versus obese girls (-9.3 ± 3.9, p = 0.02).
  
  
  CONCLUSIONS
  Fitness differences by BMI exist after a PE program in adolescent girls: fitness improved and was maintained in normal-weight and overweight girls, whereby obese girls had no improvement in fitness.
authors.affiliation: Exercise and Health Sciences Department, College of Nursing and Health Sciences, University of Massachusetts Boston, USA. sarah.camhi@umb.edu
authors.forename: Sarah M
authors.initials: SM
authors.lastname: Camhi
authors.forename: Jennie
authors.initials: J
authors.lastname: Phillips
authors.forename: Deborah R
authors.initials: DR
authors.lastname: Young
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D015992:Body Mass Index; D015444:Exercise; D005260:Female; D015438:Health Behavior; D006293:Health Promotion / Q000379:methods; D006304:Health Status; D006801:Humans; D008137:Longitudinal Studies; D009765:Obesity / Q000453:epidemiology / Q000517:prevention & control*; D010806:Physical Education and Training / Q000379:methods*; D012572:School Health Services / Q000458:organization & administration; D014481:United States