Effects of sun exposure and dietary vitamin D intake on serum 25-hydroxyvitamin D status in hemodialysis patients

Title
Effects of sun exposure and dietary vitamin D intake on serum 25-hydroxyvitamin D status in hemodialysis patients
Authors
이상선
Keywords
Hemodialysis; 25-hydroxyvitamin D; sun-exposure; hypovitaminosis D
Issue Date
2015-04
Publisher
KOREAN NUTRITION SOC
Citation
NUTRITION RESEARCH AND PRACTICE, v. 9, NO 2, Page. 158-164
Abstract
BACKGROUND/OBJECTIVES: Vitamin D deficiency is common in hennodialysis patients. The aim of this study was to identify whether or not sun exposure and dietary vitamin D intake have effects on serum 25-hydroxyvitamin D (25(OH)D) status in hemodialysis (HD) patients. The objective was to identify the main determinants of serum vitamin D status in the study subjects. SUBJECTS/METHODS: A cross-sectional study of 47 HD patients (19 males and 28 females) was performed. We assessed serum 25(OH)D and 1,25(OH)(2)D levels between August and September 2012 and analyzed the prevalence of vitamin D deficiency in HD patients. To evaluate the determinants of serum 25(OH)D levels, we surveyed dietary vitamin D intake, degree of sun exposure, and outdoor activities. To compare biological variables, serum 25(OH)D was stratified as below 15 ng/ml or above 15 ng/ml. RESULTS: Mean 25(OH)D and 1,25(OH)(2)D levels were 13.5 +/- 5.8 ng/ml and 20.6 +/- 11.8 pg/ml, respectively. The proportions of serum 25(OH)D deficiency (˂15 ng/ml), insufficiency (15-˂30 ng/ml), and sufficiency (˃= 30 ng/ml) in subjects were 72.4%, 23.4%, and 4.3%, respectively. Prevalence of vitamin D deficiency in female patients was 78.6%, whereas that in males was " 63.2% (P = 0.046). Vitamin D intake and sun exposure time were not significantly different between the two stratified serum 25(OH)D levels. Dietary intake of vitamin D did not contribute to increased serum 25(OH)D levels in HD patients. The main effective factors affecting serum 25(OH)D status were found to be the sun exposure and active outdoor exercise. CONCLUSIONS: Hypovitaminosis D is common in HD patients and is higher in females than in males. Sun exposure is the most important determinant of serum 25(OH)D status in HD patients.
URI
http://synapse.koreamed.org/DOIx.php?id=10.4162/nrp.2015.9.2.158http://hdl.handle.net/20.500.11754/23556
ISSN
1976-1457; 2005-6168
DOI
http://dx.doi.org/10.4162/nrp.2015.9.2.158
Appears in Collections:
COLLEGE OF HUMAN ECOLOGY[S](생활과학대학) > FOOD & NUTRITION(식품영양학과) > Articles
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