Seasonal variation in the serum 25-hydroxyvitamin D levels of young and elderly active and inactive adults in Sao Paulo, Brazil The Sao Paulo Vitamin D Evaluation Study (SPADES)

Autor(es)

Maeda, Sergio Setsuo ; Saraiva, Gabriela Luporini ; Hayashi, Lilian Fukusima ; Cendoroglo, Maysa Seabra ; Ramos, Luiz Roberto ; Correa, Marcelo de Paula ; de Mesquita, Carlos Henrique ; Lazaretti-Castro, Marise

• Tipo de documento: Artigo Científico
• Fonte: DERMATO-ENDOCRINOLOGY; v. 5, n. 1, p. 7-pg., 2013-01-01.

Resumo

Objective: To evaluate the 25-hydroxyvitamin D [25(OH) D] concentrations in individuals in the city of Sao Paulo belonging to different age groups and exhibiting specific behavioral characteristics and to correlate the 25(OH) D concentration with the level of UV radiation (UVR). Results: The UVR values varied throughout the year, following a sinusoidal-like pattern. Because of the Earth's orbit, we hypothesized that there would be cyclic patterns for the 25(OH) D and UVR values that repeat every 12 mo. The general formula is represented by the equation The mean 25(OH) D concentration and the amplitude of the variation were significantly higher for the YOUNG and ACTIVE groups than for the COMMUNITY and NURSING groups. The nadir for UVR was in June, whereas the nadir for the 25(OH) D concentration was in the spring, corresponding to a delay of one season. P-1 +P-2 center dot sin(2 center dot pi/12 center dot(t - p(3))) Patients and Methods: A total of 591 individuals were included, distributed as follows: 177 were living in institutions (NURSING, 76.2 +/- 9.0 y old), 243 were part of the community elderly (COMMUNITY, 79.6 +/- 5.3 y old), 99 were enrolled in a physical activity program targeting the elderly (ACTIVE, 67.6 +/- 5.4 y old) and 72 were young (YOUNG, 23.9 +/- 2.8 y old). Blood samples from all individuals were collected throughout the year. UVR measurements were taken by an official meteorology institution. Conclusions: There was seasonal variation in the 25(OH) D concentration for all the groups studied; however, the amplitude of the variation was higher for the groups of young and physically active people, possibly due to the higher level of sunlight exposure for these groups. The lowest 25(OH) D concentration was detected in the spring. (AU)

• Processo FAPESP: 03/13194-6 - Análise das correlações entre Vitamina D e parâmetros da função neuro-muscular em idosos institucionalizados
• Beneficiário: Marise Lazaretti Castro
• Modalidade de apoio: Auxílio à Pesquisa - Regular