Korean Journal of Community Nutrition

Original Articles

[English]
Vitamin D intake, Outdoor Activity Time and Serum 25-OH Vitamin D Concentrations of Korean Postmenopausal Women by Season and by Age: Jin Sook Yoon, Min Kyoung Song; Korean J Community Nutr 2015;20(2):120-128. Published online April 30, 2015; DOI: https://doi.org/10.5720/kjcn.2015.20.2.120

OBJECTIVES
The purpose of this study was to examine the relative impact of seasonal differences and age on dietary vitamin D intakes, outdoor activity time and serum vitamin D status among Korean postmenopausal women.
METHODS
A cross-sectional study was conducted with 164 free-living postmenopausal women (mean age=55.4 years) in Daegu, Korea. Dietary intake, daily physical activity patterns and fasting blood samples were collected during summer and winter. We compared the results from 75 women during summer and 89 women during winter. Dietary intake of vitamin D was assessed by 24-hour recall method. Daily outdoor activity time was derived from physical activity diary.
RESULTS
The average dietary intake of vitamin D of the participants was 3.7 microg during summer, 3.3 microg during winter, showing no significant difference between the two seasons. The average time spent on outdoor activities was not significantly different between summer (=35.1 +/- 75.0 min/d) and winter (=48.5 +/- 76.8 min/d). The average serum 25-(OH) vitamin D concentrations of participants was 17.5 +/- 7.5 ng/mL in the summer and 13.4 +/- 4.3 ng/mL in the winter, showing no significant differences by season. Dietary intake of vitamin D was not related to age. When total subjects were divided into two groups by age, the average serum 25-(OH) vitamin D concentration was significantly higher in older group (p=0.047) and time spent on outdoor activities was also (p=0.018) significantly higher in the older group.
CONCLUSIONS
In order to improve the current vitamin D status of Korean postmenopausal women, nutrition education programs should focus more on adequate intake of vitamin D, while maintaining enough outdoor activities over the season.

Citations

Citations to this article as recorded by

Vitamin D intake and bone mineral density in Korean adults: analysis of the 2009–2011 Korea National Health and Nutrition Examination Survey
Hyejin You, Hye Ran Shin, SuJin Song, Sun Yung Ly
Nutrition Research and Practice.2022; 16(6): 775. CrossRef
Differences in serum ferritin and vitamin D levels of Korean women with obesity and severe obesity
Nan Hui Kang, Ji Sook Park, Hongchan Lee, Jung-Eun Yim
Journal of Nutrition and Health.2020; 53(4): 381. CrossRef
Cardiorespiratory Fitness is Inversely Associated with Risk of Low Bone Mineral Density in Older Korean Men
Inhwan Lee, Jeonghyeon Kim, Hyunsik Kang
International Journal of Environmental Research and Public Health.2020; 17(21): 7907. CrossRef
Association between vitamin D deficiency and anemia among Korean adolescent girls and young women
Haeun Jang, Seonghee Park, Kyong Park
Journal of Nutrition and Health.2019; 52(6): 552. CrossRef
Sex- and age group-specific associations between intakes of dairy foods and pulses and bone health in Koreans aged 50 years and older: Based on 2008~2011 Korea National Health and Nutrition Examination Survey
Hyun-Bi Seo, Young-Sun Choi
Journal of Nutrition and Health.2016; 49(3): 165. CrossRef

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[English]
Seasonal Differences in Outdoor Activity Time and Serum 25-(OH) Vitamin D Status of Korean Young Women: Jin Sook Yoon, Min Kyoung Song; Korean J Community Nutr 2014;19(3):231-240. Published online June 30, 2014; DOI: https://doi.org/10.5720/kjcn.2014.19.3.231

Abstract PDF PubReader

OBJECTIVES
This study was intended to examine the seasonal differences in outdoor activity times and dietary vitamin D intakes, and explicates their relative impact on improving serum 25-(OH) vitamin D status among Korean young women.
METHODS
A cross-sectional study was conducted with 135 free-living women aged 19-39 years in Daegu-Kyungbook, Korea. We compared the results from 52 women for the summer and 83 women for the winter. Dietary intake of vitamin D was assessed by 24 hour recall method for non-consecutive three days as well as by food frequency method. Daily outdoor activity times were derived from 24 hour physical activity diary.
RESULTS
The average dietary intake of vitamin D of the participants by 24 hour recall method was 3.1 microg during the summer, 3.3 microg during the winter, showing no significant difference between the two seasons. Times spent on outdoor activities (p < 0.01) in the summer (= 23.8 +/- 23.6 min) were much longer than that in the winter (= 10.8 +/- 13.4 min). The serum 25-(OH) vitamin D levels of participants were 17.5 +/- 7.5 ng/mL in the summer and 13.4 +/- 4.3 ng/mL in the winter, showing that the latter was significantly lower than that of the former (p < 0.001). The serum 25-(OH) vitamin D levels of subjects were positively related to outdoor activities (r = 0.315, p < 0.05) during the summer, while related to dietary intake (r = 0.252, p < 0.05) during the winter.
CONCLUSIONS
In order to improve the current vitamin D status of Korean young women, nutrition education programs should focus on increasing more dietary intake especially during the winter, and performing more outdoor activities in other seasons.

Citations

Citations to this article as recorded by

Vitamin D intake, Outdoor Activity Time and Serum 25-OH Vitamin D Concentrations of Korean Postmenopausal Women by Season and by Age
Jin-Sook Yoon, Min-Kyoung Song
Korean Journal of Community Nutrition.2015; 20(2): 120. CrossRef
The relationship between Physical Growth and Major Sources of Serum Vitamin D among Hospitalized Children of Changwon City
Haeyoung Kang, Eunsil Her, Kyung-Hea Lee
Korean Journal of Community Nutrition.2015; 20(3): 197. CrossRef
Association between serum vitamin D and depressive symptoms among female workers in the manufacturing industry
Soon Il Kwon, Jun Seok Son, Young Ouk Kim, Chang Ho Chae, Ja Hyun Kim, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Jun Ick Jung
Annals of Occupational and Environmental Medicine.2015;[Epub] CrossRef

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[English]
Serum 25-Hydroxyvitamin D Status and Associated Factors in Premenopausal Working Women: Hwa Jae Lim; Korean J Community Nutr 2005;10(1):79-90. Published online February 28, 2005

Abstract PDF: This study was performed to estimate serum 25-hydroxyvitamin D level and to evaluate the relationship between serum 25-hydroxyvitamin D level and associated factors. The subjects were 61 premenopausal working women aged 30 - 49 y in Busan. The serum 25-hydroxyvitamin D level was measured by radioimmunoassay. Data for physiological characteristics, lifestyle factors, physical activity and nutrient intake were assessed by questionnaire including information about outdoor activity time, daily activity diary and 24 hr recall method. The mean vitamin D intake was 3.12 ug, which corresponded to 62.5% of the Korean RDA. The mean level of serum 25-hydroxyvitamin D was 31.0 ng/mL. Low 25-hydroxyvitamin D (<25 nmol/L) was not found in the subjects. The serum 25-hydroxyvitamin D level showed positive significant correlations with exercise hours, daily energy expenditure, hours of outdoor activity per weekdays (p< 0.001, p< 0.05, p< 0.05). Exercise hours were found to be the most important determinant of serum 25-hydroxyvitamin D level. Therefore nutritional education for increasing hours of physical activity including indoor and outdoor exercise, is needed for premenopausal working women to increase vitamin D status.

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