Korean J Fam Pract. 2018; 8(5): 716-722  https://doi.org/10.21215/kjfp.2018.8.5.716
Effects of Physical Activity and Sedentary Time on Obesity: The Sixth Korea National Health and Nutrition Examination Survey 2013
Jin A Kim, Yong Hwa Jung, Keun Joo Bae, Ji Hyun Kim, Suk Won Park, Kyung-Hwan Cho, Yang-Hyun Kim*
Department of Family Medicine, Korea University College of Medicine, Seoul, Korea
Yang-Hyun Kim
Tel: +82-2-920-6928, Fax: +82-2-928-8083
E-mail: mrchir@naver.com
ORCID: http://orcid.org/0000-0003-3548-8758
Kyung-Hwan Cho and Yang-Hyun Kim contributed equally to this study.
Received: July 20, 2017; Revised: October 2, 2017; Accepted: October 19, 2017; Published online: October 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.
Background: Obesity leads to a lower quality of life and shorter life span owing to associated increase in the risk of chronic diseases. There are many causative factors for obesity, and the present study specifically investigates the effects of the amount of physical activity and time spent sitting, on development of obesity.
Methods: Using the results of the Korea National Health and Nutrition Examination Survey for 2013 as the first year of the 6th panel, responses from 3,607 respondents (2,171 males, 1,436 females) were analyzed. The correlation between physical activity, sedentary time, obesity, and abdominal obesity was analyzed using a multiple logistic regression analysis and odds ratio (OR), and 95% confidence intervals (CI) were calculated.
Results: The results showed that sitting time was longer in women without abdominal obesity than in those with (P=0.0272), and shorter in both men and women with high level of physical activity (female [P=0.001], male [P=0.001], both [P<0.001]). In case of men, risk of abdominal obesity was lower in the group with shorter sitting time and more physical activity than the group with longer sitting time and less physical activity (OR=0.306, 95% CI=0.121–0.776).
Conclusion: Among the factors that may cause obesity and abdominal obesity, lifestyle and health behavior need to be properly identified, and physical activity should be encouraged, to reduce abdominal obesity, particularly in males.
Keywords: Obesity; Abdominal Obesity; Physical Activity; Sitting Time
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