Ana Carla Moreira da Silva1, Felipe Vogt Cureau2,3, Cecília Lacroix de Oliveira4, Denise Tavares Giannini5, Katia Vergetti Bloch6, Maria Cristina Caetano Kuschnir7, Eliane Said Dutra1, Beatriz D Schaan8,9, Kênia Mara Baiocchi de Carvalho1. 1. Graduate Program in Human Nutrition, Universidade de Brasília, Brasília, Brazil. 2. Graduate Program in Endocrinology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil. fvcureau@gmail.com. 3. Institute of Health Technology Assessment (IATS), Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil. fvcureau@gmail.com. 4. Instituto de Nutrição, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil. 5. Hospital Universitário Pedro Ernesto, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil. 6. Instituto de Estudos em Saúde Coletiva, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil. 7. Graduate Program in Medical Sciences, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil. 8. Graduate Program in Endocrinology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil. 9. Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil.
Abstract
BACKGROUND/ OBJECTIVES: The association between active lifestyle components and vitamin D status in adolescents remains relatively unexplored. We aimed to investigate independent and joint associations of moderate-to-vigorous physical activity (MVPA) and screen time with serum 25-hydroxyvitamin D [25(OH)D] concentrations in adolescents. METHODS: This multicenter cross-sectional study involved 1152 Brazilian adolescents (age 12-17 years). Serum 25(OH)D was measured in a single laboratory and categorized as ≤20, 21-29, or ≥30 ng/mL. Demographic and lifestyle characteristics were assessed by self-reports. Ordered logistic regression was used to investigate potential associations of being physically active (MVPA ≥ 300 min/week) and excessive screen time (>2 h/day) with serum 25(OH)D concentrations. RESULTS: The prevalence of higher serum 25(OH)D concentrations (≥30 ng/mL) was 36.4%. In adjusted models, being physically active was associated with higher serum 25(OH)D concentrations only in boys [proportional odds ratio (POR) = 2.04, 95% CI 1.42-2.93], while excessive screen time was not associated with serum 25(OH)D. Adolescents who were physically active and limited their screen time had higher odds of a higher serum 25(OH)D concentration, but the association was significant only for boys (POR = 2.11, 95% CI 1.19-3.74). CONCLUSIONS: MVPA may play an important role in increasing serum 25(OH)D concentrations in adolescence, especially for boys, regardless of screen time.
BACKGROUND/ OBJECTIVES: The association between active lifestyle components and vitamin D status in adolescents remains relatively unexplored. We aimed to investigate independent and joint associations of moderate-to-vigorous physical activity (MVPA) and screen time with serum 25-hydroxyvitamin D [25(OH)D] concentrations in adolescents. METHODS: This multicenter cross-sectional study involved 1152 Brazilian adolescents (age 12-17 years). Serum 25(OH)D was measured in a single laboratory and categorized as ≤20, 21-29, or ≥30 ng/mL. Demographic and lifestyle characteristics were assessed by self-reports. Ordered logistic regression was used to investigate potential associations of being physically active (MVPA ≥ 300 min/week) and excessive screen time (>2 h/day) with serum 25(OH)D concentrations. RESULTS: The prevalence of higher serum 25(OH)D concentrations (≥30 ng/mL) was 36.4%. In adjusted models, being physically active was associated with higher serum 25(OH)D concentrations only in boys [proportional odds ratio (POR) = 2.04, 95% CI 1.42-2.93], while excessive screen time was not associated with serum 25(OH)D. Adolescents who were physically active and limited their screen time had higher odds of a higher serum 25(OH)D concentration, but the association was significant only for boys (POR = 2.11, 95% CI 1.19-3.74). CONCLUSIONS: MVPA may play an important role in increasing serum 25(OH)D concentrations in adolescence, especially for boys, regardless of screen time.
Authors: Zeljka Karin; Barbara Gilic; Daniela Supe Domic; Zdenko Sarac; Katarina Ercegovic; Natasa Zenic; Ognjen Uljevic; Mia Peric; Josko Markic Journal: Int J Environ Res Public Health Date: 2018-11-08 Impact factor: 3.390
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