1. Association between Night-shift Work and Serum 25-hydroxyvitamin D Levels in Japanese Male Indoor Workers: A Cross-sectional Study
- Author
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Masaya Takahashi, Kanehisa Morimoto, Masako Hasegawa-Ohira, Hiroyuki Saito, Yasutaka Ogawa, Zuquan Weng, Syou Maki, Hiroaki Itoh, and Kunio Nakayama
- Subjects
Adult ,Male ,Gerontology ,Cross-sectional study ,business.industry ,Health, Toxicology and Mutagenesis ,Personnel Staffing and Scheduling ,Public Health, Environmental and Occupational Health ,Middle Aged ,medicine.disease ,vitamin D deficiency ,Shift work ,Male workers ,Cross-Sectional Studies ,Japan ,Sleep Disorders, Circadian Rhythm ,Vitamin D and neurology ,Humans ,Medicine ,Vitamin D ,Serum 25 hydroxyvitamin d ,business ,Night work ,Night Shift Work ,Demography - Abstract
Although low vitamin D status resulting from night work is a suspected cause of various health disorders, few studies have investigated the association between night-shift work and vitamin D status. Here, we examined serum 25-hydroxyvitamin D (25OHD) levels in 19 Japanese indoor workers, including night-shift workers, in blood samples collected at the annual medical checkup (late July) in a metal tool factory. Analyses were finally restricted to 14 male workers (33-59 yr) in 3 groups: fixed daytime work (n=6), and rotating shift work with (n=4) and without (n=4) night shifts. No significant differences in serum 25OHD levels were observed among the three groups (p=0.98, Kruskal-Wallis test). One to two participants in each group had 25OHD levels lower than the 20 ng/ml reference value for vitamin D deficiency even in summer. These results clearly indicate the need for large-scale studies to test the hypothesis that night-shift work is associated with lower 25OHD levels.
- Published
- 2011
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