Korean J Health Promot KJHP Korean Journal of Health Promotion 2234-2141 2093-5676 Korean Society for Health Promotion and Disease Prevention 10.15384/kjhp.2019.19.2.91 Original Article Relationship between the Change in Body Weight or Body Mass Index and Pulmonary Function Kim Taeyoung Woo Jeonghyun Lee Woohyun Jo Seonkyung Chun Hyejin Department of Family Medicine, Bundang CHA Medical Center, CHA University, Seongnam, Korea. Corresponding author : Hyejin Chun, MD, PhD. Department of Family Medicine, Bundang CHA Medical Center, CHA University, 59 Yatap-ro, Bundang-gu, Seongnam 13496, Korea. Tel: +82-31-780-5360, Fax: +82-31-780-5944, hyejinchun@chamc.co.kr 06 2019 30 06 2019 19 2 91 95 11 06 2019 09 07 2019 09 07 2019 Copyright © 2019 Korean Society for Health Promotion and Disease Prevention 2019 Korean Society for Health Promotion and Disease Prevention This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Background

Obesity and deterioration of pulmonary function are known to increase all-cause mortality and morbidity associated with chronic diseases. Obesity is a known risk factor for decreasing pulmonary function; however, studies on the effect of changes in body weight or body mass index (BMI) on pulmonary function are rare. This study aimed to investigate the relationship between the change in body weight or BMI and the pulmonary function test (PFT) in Koreans who underwent consecutive screening at a health promotion center.

 Methods

We enrolled 5,032 patients who underwent consecutive screening health check-ups at a health promotion center in 2015 and 2017. The BMI was calculated as the body weight (kg) divided by the square of the height (m2) in 2015 and 2017. We analyzed the association between the change in body weight or BMI and PFT.

 Results

In males, PFT and changes in body weight were associated with forced expiratory volume in 1 second (FEV1) but not with changes in BMI. In females, FEV1/forced vital capacity and forced expiratory flow between 25–75% of vital capacity (FEF25−75%) were significantly associated with the changes in body weight and BMI. A correlation analysis between body weight and BMI showed a negative correlation with FEF25−75% in males. In females, FEV1/FVC and FEF25−75% were negatively correlated.

 Conclusions

We observed that the increase in body weight and BMI was significantly associated with pulmonary function. This finding suggests that careful monitoring of body weight and BMI may aid in maintaining proper pulmonary function, thereby, reducing mortality and morbidity.

 Obesity Pulmonary function tests Body mass index Body weight Rural Development Administration https://doi.org/10.13039/501100003627 PJ011253062018

This study was supported by a research grant from Agriculture Science & Technology Development (Project No. PJ011253062018) of Rural Development Administration, Repulic of Korea.

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Abbreviations: BMI, body mass index; FEF25–75%, forced expiratory flow between 25–75% of vital capacity; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; ΔBMI, the difference in BMI of 2015 and 2017; ΔWt., the difference in body weight of 2015 and 2017.

Values are presented as mean±standard deviation.

 The partial correlation between difference in body weight and pulmonary function test

Abbreviations: FEF25–75%, forced expiratory flow between 25–75% of vital capacity; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; r, partial correlation coefficient adjusted by age; ΔFEF25–75%, the difference in FEF25–75% of 2015 and 2017 that except negative value; ΔFEV1, the difference in FEV1 of 2015 and 2017 that except negative value; ΔFEV1/FVC, the difference in FEV1/FVC of 2015 and 2017 that except negative value; ΔFVC, the difference in FVC of 2015 and 2017 that except negative value; ΔWt., the difference in body weight of 2015 and 2017 that except negative value.

 The partial correlation between difference in body mass index and pulmonary function test

Abbreviations: BMI, body mass index; FEF25–75%, forced expiratory flow between 25–75% of vital capacity; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; r, partial correlation coefficient adjusted by age; ΔBMI, the difference in BMI of 2015 and 2017 that except negative value; ΔFEF25–75%, the difference in FEF25–75% of 2015 and 2017 that except negative value; ΔFEV1, the difference in FEV1 of 2015 and 2017 that except negative value; ΔFEV1/FVC, the difference in FEV1/FVC of 2015 and 2017 that except negative value; ΔFVC, the difference in FVC of 2015 and 2017 that except negative value.

 Association between difference in body weight and pulmonary function test

Abbreviations: (−) group, the negative value of difference in body weight of 2015 and 2017; (+) group, the positive value of difference in body weight of 2015 and 2017; FEF25–75%, forced expiratory flow between 25–75% of vital capacity; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; ΔWt., the difference in body weight of 2015 and 2017.

Values are presented as mean±standard deviation.

 Association between difference in body mass index and pulmonary function test

Abbreviations: (−) group, the negative value of difference in BMI of 2015 and 2017; (+) group, the positive value of difference BMI of 2015 and 2017; BMI, body mass index; FEF25–75%, forced expiratory flow between 25–75% of vital capacity; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; ΔBMI, the difference in BMI of 2015 and 2017.

Values are presented as mean±standard deviation.