Titre :
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Objectively assessed associations between physical activity and body composition in middle-school girls the trial of activity for adolescent girls. (2007)
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Auteurs :
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June STEVENS ;
Chris-D BAGGETT ;
John-P ELDER ;
Timothy-G LOHMAN ;
Leslie-A LYTLE ;
David-M MURRAY ;
Russell-R PATE ;
Charlotte-A PRATT ;
Margarita-S TREUTH ;
Larry-S WEBBER ;
Deborah-R YOUNG
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Type de document :
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Article
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Dans :
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American journal of epidemiology (vol. 166, n° 11, 2007)
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Pagination :
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1298-1305
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Langues:
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Anglais
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Mots-clés :
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Association
;
Activité physique
;
Adolescent
;
Enfant
;
Femme
;
Tissu adipeux
;
Anthropométrie
;
Croissance
;
Epidémiologie
;
Amérique
;
Homme
;
Amérique du Nord
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Résumé :
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[BDSP. Notice produite par INIST-CNRS s9zMBR0x. Diffusion soumise à autorisation]. Declining levels of physical activity probably contribute to the increasing prevalence of overweight in US youth. In this study, the authors examined cross-sectional and longitudinal associations between physical activity and body composition in sixth-and eighth-grade girls. In 2003, girls were recruited from six US states as part of the Trial of Activity for Adolescent Girls. Physical activity was measured using 6 days of accelerometry, and percentage of body fat was calculated using an age-and ethnicity-specific prediction equation. Sixth-grade girls with an average of 12.8 minutes of moderate-to-vigorous physical activity (MVPA) per day (15th percentile) were 2.3 times (95% confidence interval : 1.52,3.44) more likely to be overweight than girls with 34.7 minutes of MVPA per day (85th percentile), and their percent body fat was 2.64 percentage points greater (95% confidence interval : 1.79,3.50). Longitudinal analyses showed that percent body fat increased 0.28 percentage points less in girls with a 6.2-minute increase in MVPA than in girls with a 4.5-minute decrease (85th and 15th percentiles of change). Associations between MVPA in sixth grade and incidence of overweight in eighth grade were not detected. More population-based research using objective physical activity and body composition measurements is needed to make evidence-based physical activity recommendations for US youth.
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