| Titre : | Objectively assessed associations between physical activity and body composition in middle-school girls the trial of activity for adolescent girls. (2007) |
| Auteurs : | 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 |
| Type de document : | Article |
| Dans : | American journal of epidemiology (vol. 166, n° 11, 2007) |
| Pagination : | 1298-1305 |
| Langues: | Anglais |
| Mots-clés : | Association ; Activité physique ; Adolescent ; Enfant ; Femme ; Tissu adipeux ; Anthropométrie ; Croissance ; Epidémiologie ; Amérique ; Homme ; Amérique du Nord |
| Résumé : | [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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