Journal
NUTRITION RESEARCH
Volume 103, Issue -, Pages 11-20Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.nutres.2022.03.001
Keywords
Vitamin D; Aging; Physical activity; Adipose tissue; Structural equation modeling
Categories
Funding
- UFSC
- Conselho Nacional de Desenvolvimento CientIfico e Tecnologico [475.904/2013-3]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior [001]
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This study found that physical activity has a direct effect on serum 25(OH)D, and body fat composition has a small contribution as a mediator in this relationship.
Studies have found that physical activity (PA) could be a protective factor and adiposity a risk factor for low serum 25-hydroxycholecalciferol (25(OH)D) concentration. This crosssectional study hypothesized that PA could have a direct effect on 25(OH)D, and adiposity could be a mediating factor. Data from the second wave of the EpiFloripa Aging longitudinal study, collected during 2013 and 2014 (n = 1197) in Florianopolis, Santa Catarina, Brazil, was used. PA was measured using an accelerometer and classified as light PA (LPA), moderate and vigorous PA (MVPA), and total PA (TPA); 25(OH)D levels were measured using the microparticle chemiluminescence method. Body fat composition (%fat) was assessed using dual-energy X-ray absorptiometry. Structural equation modeling was performed to analyze the total, direct, and indirect effects of PA on %fat and 25(OH)D levels, presented using the standardized coefficient (beta). Participants with complete data were included in the analysis (n = 574, 66.7% female). MVPA showed a direct ( beta = 0.11; P < .05) and total positive effect on 25(OH)D (beta = 0.12; P < .05). All models of PA had a direct negative effect on %fat. Additionally, a direct negative effect of %fat on 25(OH)D was observed in all models. A marginal and partial effect of %fat as a mediator of the relationship between MVPA and 25(OH)D was noted (beta = 0.01, P = .09). Our results show that PA presents a direct effect on serum 25(OH)D. %fat has a small contribution as a mediator of this relationship. These data suggest that an increase in MVPA and a decrease in %fat could be strategies to increase 25(OH)D levels in older adults. (C)& nbsp;2022 Elsevier Inc. All rights reserved.
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