Korean J Fam Pract.  2020 Apr;10(2):123-128. 10.21215/kjfp.2020.10.2.123.

Associations of Physical Activity and Sitting Time with Serum Vitamin D Status in Korean Adults: Results from the 2014 Korea National Health and Nutrition Examination Survey

• Choo J
• Nam GE
• Park J
• Park CM
• Lee SJ
• Lee M
• Kim J
• Shin JH
• Huh Y
• Kim W
• Kwon Y
• Kim YH
• Cho KH

• KMID: 2502320
• DOI: http://doi.org/10.21215/kjfp.2020.10.2.123

Abstract

Background
Recent evidence has reported the relationships between 25-hydroxyvitamin D (25[OH]D) insufficiency and chronic diseases. This study examined the association of physical activity and sitting time with vitamin D status.
Methods
This study analyzed the data of 1,598 adults aged ≥19 who participated in the 2014 Korea National Health and Nutrition Examination Survey. Vitamin D insufficiency was defined as a serum 25(OH)D level of ≤20 ng/mL. The odds ratios and 95% confidence intervals of vitamin D insufficiency according to physical activity and sitting time were calculated using a multivariable logistic regression analysis.
Results
The mean levels of serum 25(OH)D were 16.5 ng/mL in males and 15.2 ng/mL in females, respectively and was significantly higher in the participants with sitting times of <5 hours/day than those with sitting times of ≥5 hours/day. After adjusting for confounding variables, sitting time of <5 hours/day was associated with decreased odds of vitamin D insufficiency as compared with sitting time of ≥5 hours/day in the total participants and females. In addition, the odds ratio for vitamin D insufficiency was significantly lower in the group with sitting times of <5 hours/ day than in the group with sitting times of ≥5 hours/day even among people with low physical activity in the total participants and females.
Conclusion
Serum 25(OH)D level was insufficient in the Korean adults and shorter sitting time was related to lower odds ratio of vitamin D insufficiency. Our findings suggest that sitting time is an independent factor of serum vitamin D status.

Keyword

25-Hydroxyvitamin D; Vitamin D; Physical Activity; Sitting Time; Korean