title: Agreement in activity energy expenditure assessed by accelerometer and self-report in adolescents: variation by sex, age, and weight status.
abstract: The agreement between self-reported and objective estimates of activity energy expenditure was evaluated in adolescents by age, sex, and weight status. Altogether, 403 participants (217 females, 186 males) aged 13-16 years completed a 3-day physical activity diary and wore a GT1M accelerometer on the same days. Partial correlations (controlling for body mass) were used to determine associations between estimated activity energy expenditure (kcal · min(-1)) from the diary and accelerometry. Differences in the magnitude of the correlations were examined using Fisher's r to z transformations. Bland-Altman procedures were used to determine concordance between the self-reported and objective estimates. Partial correlations between assessments of activity energy expenditure (kcal · min(-1)) did not differ significantly by age (13-14 years: r = 0.41; 15-16 years: r = 0.42) or weight status (normal weight: r = 0.42; overweight: r = 0.39). The magnitude of the association was significantly affected by sex (Δr = 0.11; P < 0.05). The agreement was significantly higher in males than in females. The relationship between activity energy expenditure assessed by the objective method and the 3-day diary was moderate (controlling for weight, correlations ranged between 0.33 and 0.44). However, the 3-day diary revealed less agreement in specific group analyses; it markedly underestimated activity energy expenditure in overweight/obese and older adolescents. The assessment of activity energy expenditure is complex and may require a combination of methods.
authors: University of Coimbra, Coimbra, Portugal. rodriguesari@hotmail.com
authors: Aristides M
authors: AM
authors: Machado-Rodrigues
authors: Manuel J
authors: MJ
authors: Coelho-E-Silva
authors: Jorge
authors: J
authors: Mota
authors: Edilson
authors: E
authors: Cyrino
authors: Sean P
authors: SP
authors: Cumming
authors: Chris
authors: C
authors: Riddoch
authors: Gaston
authors: G
authors: Beunen
authors: Robert M
authors: RM
authors: Malina
mesh_terms: D056044:Actigraphy / Q000379:methods; D000293:Adolescent; D000367:Age Factors; D001835:Body Weight; D004734:Energy Metabolism; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009765:Obesity / Q000503:physiopathology; D015203:Reproducibility of Results; D057566:Self Report; D012737:Sex Factors