Korean J Fam Pract. 2018; 8(3): 354-358  https://doi.org/10.21215/kjfp.2018.8.3.354
Relationship between Serum Vitamin D Concentration and Pulmonary Function in Obese Nonsmokers
Hyerin Shin, Seon Yeong Lee*, Kyunam Kim, Dae Youn Kim, Jihye Won, Jeongki Paek
Department of Family Medicine, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea
Seon Yeong Lee
Tel: +82-2-950-1150, Fax: +82-2-950-1153
E-mail: sylee@paik.ac.kr
ORCID: http://orcid.org/0000-0002-8274-3654
Received: June 5, 2017; Revised: September 8, 2017; Accepted: September 13, 2017; Published online: June 20, 2018.
© The Korean Academy of Family Medicine. All rights reserved.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Background: Low blood vitamin D levels have been postulated to be a risk factor for poor lung function in many studies. There has also been an increase in the number of studies over the past decade that have identified an association between obesity and vitamin D deficiency; both are recognized as major public health issues worldwide. The aim of this study was to investigate the relationship of the current vitamin D status with lung function in obese individuals.
Methods: We used cross-sectional data from 2,261 participants who underwent evaluation of 25-hydroxyvitamin D (25(OH)D) levels and lung function tests at a health promotion center from January 2016 to November 2016. We included individuals with body mass index of 25 kg/m2 or greater and who exhibited no abnormalities on chest radiography. We excluded smokers and ex-smokers who had discontinued smoking within 15 years.
Results: After adjustments for sex, age, and height, forced vital capacity (FVC) and forced expiratory volume in 1s (FEV1) showed positive linear relationships with serum 25(OH)D (P=0.049 and P=0.043, respectively). However, FVC/FEV1 had no significant relationship with serum 25(OH)D (P=0.668).
Conclusion: This study showed a significant positive relationship between serum concentrations of 25(OH)D and respiratory function in obese individuals.
Keywords: Vitamin D; Obesity; Respiratory Function Tests
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