Sun exposure, UV irradiance and serum 25-hydroxycholecalciferol in pregnant women in rural north India
Bibliographic Data
| ID | 15096792 |
|---|---|
| Authors | Siddhnath Sudhanshu (0000-0003-1684-6089, Sanjay Gandhi Post Graduate Institute of Medical Sciences), Pramod Upadhyay (0000-0002-5560-822X, National Institute of Immunology), Monashish Sahu (Max Healthcare), Vinita Rawat (0000-0002-0798-6699, Government Medical College), Vijayalakshmi Bhatia (0000-0003-4683-664X, Sanjay Gandhi Post Graduate Institute of Medical Sciences, corresponding author) |
| Year | 2017 |
| Volume | 20 |
| Issue | 10 |
| Pages | 1755-1759 |
| Publication date | 2017-07-01 |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | Public Health Nutrition (JOURNAL) |
| Journal identifiers | ISSN: 1368-9800 • E-ISSN: 1475-2727 |
| Publisher | Cambridge University Press (CUP) (PUBLISHER) |
| DOI | 10.1017/s136898001600313x |
| PMID | 27989262 |
| OpenAlex | W2566822031 |
| Language | EN |
| Citations received | 2 |
| References cited | 30 |
Objective To document the effect of season and environmental pollution on UVB irradiance; and to estimate cutaneous vitamin D synthesis in village women in different seasons. Design Radiant UVB energy was measured by a spectroradiometer in different seasons and, in April and May, on successive days in open areas at the city outskirts, at a crowded inner-city area and the villages of our participants. Clothing, outdoor activity pattern and serum 25-hydroxycholecalciferol (25(OH)D) levels were documented. Setting Rural north India, latitude 26·8°N. Subjects Pregnant women ( n 139, aged 20–40 years). Results UVB irradiance ranged from 56 μW/cm 2 in January to 470 μW/cm 2 in June. Proportion of skin exposed was 18·5 % in summer and 9·5 % in winter. Mean ( sd ) daily duration of sun exposure was 3·2 (0·2) h during winter and 2·1 (0·4) h during summer. Cutaneous vitamin D synthesis was estimated to be 19·25 μg (770 IU) during winter and 37·25 μg (1490 IU) during summer. Mean ( sd ) serum 25(OH)D was 28 (15) nmol/l during winter (92 % of participants with 50 nmol/l). Mean ( sd ) UVB irradiance at peak summer was significantly higher at the open areas and in the villages than at the inner-city location (340 (45) and 310 (60) v . 250 (50) μW/cm 2 , P =0·03). Conclusions In our population, at latitude 26·8°N, poor skin exposure is a limiting factor in all seasons. During winter, low UVB radiation energy also contributes. Particulate pollution limits UVB irradiance. Vitamin D supplementation during winter may be necessary
Animal science · Biology · Environmental health · Geography · Irradiance · Latitude · Limiting · Population · Seasonality · Sunlight · Vitamin D and neurology · Climate Change and Health Impacts · Environmental Science · Medicine · Skin Protection and Aging · Vitamin D Research Studies · Ecology · Internal Medicine
| Citations per year | 0.22 |
|---|---|
| Citation span | 2017 - 2024 (8) |
| Highly cited | No |