Low serum concentrations of 25-hydroxyvitamin D in young adult Japanese women: a cross sectional study

Nakamura, Kazutoshi; Nashimoto, Mitsue; Matsuyama, Shigeki; Yamamoto, Masahiro

doi:10.1016/s0899-9007(01)00662-1

Cited by 73 publications

(59 citation statements)

References 23 publications

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“…Hypovitaminosis D in Japan (35°N) is more common in inactive elderly (mean 30 nmol/L) and in women younger compared to older than 30 years of age (mean 34 nmol/L) [49]. Overall, the vitamin D status in Japan is relatively better in the regions in South Asia and positively related to fish consumption [49][50][51].…”

Section: Asiamentioning

confidence: 97%

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Global vitamin D status and determinants of hypovitaminosis D

Wahl²,

et al. 2009

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Section: Asiamentioning

confidence: 97%

“…Overall, the vitamin D status in Japan is relatively better in the regions in South Asia and positively related to fish consumption [49][50][51]. Prevalence of hypovitaminosis D (<30 nmol/L) in women over 30 years old is only 10.3% [49] and in active elderly (25(OH)D <75 nmol/L) is below 5% [50].…”

Section: Asiamentioning

confidence: 98%

Global vitamin D status and determinants of hypovitaminosis D

Wahl²,

et al. 2009

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“…However, vitamin D (VD) insufficiency is a global concern (2), particularly in younger females (3,4). Approximately 90% of adolescent females are reported to show either deficiency or insufficiency of VD (5).…”

Section: Introductionmentioning

confidence: 99%

Seasonal variations in vitamin D status in indoor and outdoor female athletes

2016

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Abstract. Vitamin D (VD) insufficiency is a concern, particularly among young females. The VD status shows seasonal variations, since it correlates with duration of sunlight exposure. VD insufficiency in indoor athletes is therefore suggested in winter. The aim of the present study was to determine seasonal variations in VD and bone status among indoor and outdoor female athletes. The prospective study was conducted in participants aged 20-22 years old. The participants comprised of 15 indoor and 15 outdoor athletes. The biochemical markers and bone parameters were measured in March, June, September and December. The serum 25-hydroxyvitamin D (25-OH-VD) concentration showed a seasonal oscillation, with a nadir in March (indoor, 19±4.0 ng/ml; outdoor, 32±2.7 ng/ml) and a peak in September (indoor, 32±6.6 ng/ml; outdoor, 39±5.7 ng/ml). The amplitude of oscillation was greater in the indoor compared to the outdoor athletes. Seasonal variations in serum calcium exhibited a similar pattern, while the parathyroid hormone showed an inverse pattern to serum 25-OH-VD. The nadir in bone mass, measured as speed of sound, occurred in June after peaking in December among the indoor and outdoor athletes. The pattern followed 3 months after the changes in 25-OH-VD. Indoor sports athletes are more susceptible to VD insufficiency compared to outdoor sports athletes. Insufficiency is most likely to arise in winter, and could affect bone mineralization observed 3 months after.

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“…Although low vitamin D status resulting from night work is a suspected cause of night-shift work-related health problems 2) , few studies have investigated the association between night-shift work and circulating 25OHD levels. To date, the findings related to 25OHD levels have presented mixed results 8,9) . Clarification of the effect of night work on an individual's vitamin D status would allow the development of effective countermeasures for protecting night-shift workers from bone fracture and other hypovitaminosis D-related health problems.…”

Section: Introductionmentioning

confidence: 99%

Association between Night-shift Work and Serum 25-hydroxyvitamin D Levels in Japanese Male Indoor Workers: A Cross-sectional Study

Itoh¹,

Weng²,

Saito³

et al. 2011

Ind Health

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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.

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Low serum concentrations of 25-hydroxyvitamin D in young adult Japanese women: a cross sectional study

Cited by 73 publications

References 23 publications

Global vitamin D status and determinants of hypovitaminosis D

Global vitamin D status and determinants of hypovitaminosis D

Seasonal variations in vitamin D status in indoor and outdoor female athletes

Association between Night-shift Work and Serum 25-hydroxyvitamin D Levels in Japanese Male Indoor Workers: A Cross-sectional Study

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