Korean J Nutr.  2006 Oct;39(7):649-660.

Serum 25-Hydroxyvitamin D Status in Wintertime in Premenopausal Working Women

• Lim HJ
• Kim JI

Abstract

This study was performed to estimate serum 25-hydroxyvitamin D (25-OHD) level in wintertime and to evaluate the relationship between serum 25-OHD level and associated factors in 50 premenopausal working women aged 30 . 49 y in Busan. The serum 25-OHD level was measured by radioimmunoassay. Data for physiological characteristics, lifestyle factors, physical activity and nutrient intake was assessed by questionnaire including information about outdoor activity time, daily activity diary and 24hr recall method. The mean vitamin D intake was 4.24 ug, which corresponded to 84.9% of the Korean RDA. The mean level of serum 25-OHD was 25.7 ng/mL. Vitamin D deficiency (25-OHD < 7 nmol/L) and toxicity (25-OHD > or = 75 nmol/L) were not found in the subjects. However, the prevalence of vitamin D insufficiency (25-OHD < 15 nmol/L) and hypovitaminosis D (25-OHD < 30 nmol/L) were 12% and 60% respectively. The serum 25-OHD level showed positive significant correlations with the duration of outdoor activity per weekdays (p < 0.05). Our findings suggest that hypovitaminosis D was common in the subjects in wintertime. So nutritional education for increasing outdoor activities is needed for premenopausal working women to increase vitamin D status in wintertime.

Keyword

serum 25-hydroxyvitamin D level; vitamin D intake; physical activity; premenopausal working women; wintertime

MeSH Terms

Busan
Education
Female
Humans
Life Style
Motor Activity
Prevalence
Radioimmunoassay
Surveys and Questionnaires
Vitamin D
Vitamin D Deficiency
Women, Working*
Vitamin D