KMID : 0123420140190030231
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Korean Journal of Community Nutrition 2014 Volume.19 No. 3 p.231 ~ p.240
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Seasonal Differences in Outdoor Activity Time and Serum 25-(OH) Vitamin D Status of Korean Young Women
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Yoon Jin-Sook
Song Min-Kyoung
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Abstract
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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 ¥ìg during the summer, 3.3 ¥ìg during the winter, showing no significant difference between the two seasons. Times spent on outdoor activities (p < 0.01) in the summer (= 23.8 ¡¾ 23.6 min) were much longer than that in the winter(= 10.8 ¡¾ 13.4 min). The serum 25-(OH) vitamin D levels of participants were 17.5 ¡¾ 7.5 ng/mL in the summer and 13.4 ¡¾ 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.
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KEYWORD
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Young women, outdoor activity, serum 25-(OH)-vitamin D, vitamin D intake
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