Sex and seasonal variations of plasma retinol, alpha-tocopherol, and carotenoid concentrations in Japanese dietitians.

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dc.contributor.authorXiang, Jinen_US
dc.contributor.authorNagaya, Teruoen_US
dc.contributor.authorHuang, Xin-Enen_US
dc.contributor.authorKuriki, Kiyonorien_US
dc.contributor.authorImaeda, Nahomien_US
dc.contributor.authorTokudome, Yukoen_US
dc.contributor.authorSato, Juichien_US
dc.contributor.authorFujiwara, Nakakoen_US
dc.contributor.authorMaki, Shinzoen_US
dc.contributor.authorTokudome, Shinkanen_US
dc.date.accessioned2009-05-27T17:40:42Z
dc.date.available2009-05-27T17:40:42Z
dc.date.issued2008-07-08en_US
dc.descriptionAsian Pacific Journal of Cancer Prevention.en_US
dc.description.abstractAIM: To clarify sex and seasonal variations of plasma antioxidant concentrations among middle-aged Japanese. SUBJECTS AND METHODS: We investigated sex and seasonal variations of plasma antioxidant concentrations, including retinol, alpha-tocopherol, and carotenoids (alpha-carotene, beta-carotene, beta-cryptoxanthin, lutein and lycopene), in 55 middle-aged dietitians (46 women and 9 men) in Aichi Prefecture, Central Japan, who took no supplements from autumn 1996 to summer 1997. Reversed-phase high performance liquid chromatography was used to measure plasma antioxidant concentrations in overnight-fasting blood samples. RESULTS: Plasma levels of alpha-tocopherol, alpha-/beta-carotene, b-cryptoxanthin and lutein were significantly influenced by sex, being significantly higher for women than men in each corresponding season; retinol and lycopene, however, showed no such difference. For women, winter values of alpha-tocopherol, alpha-/beta-carotene, lutein and lycopene were significantly lower than corresponding summer values, and had reached their annual lowest. Retinol failed to show any significant seasonal variation, whereas the winter value of beta-cryptoxanthin had reached its annual highest. For men, beta-cryptoxanthin exhibited significant seasonal changes and was also highest in winter. Winter values of alpha-tocopherol, alpha-/beta-carotene and lycopene were lower compared with other seasons, but not statistically significant, probably due to the small sample size. CONCLUSIONS: The findings indicate that sex and seasonal variations of plasma antioxidant concentrations should be taken into account in nutritional epidemiologic studies.en_US
dc.description.affiliationDept of Science Research, Jiangsu Cancer Hospital and Research Institute, Nanjing, China.en_US
dc.identifier.citationXiang J, Nagaya T, Huang XE, Kuriki K, Imaeda N, Tokudome Y, Sato J, Fujiwara N, Maki S, Tokudome S. Sex and seasonal variations of plasma retinol, alpha-tocopherol, and carotenoid concentrations in Japanese dietitians. Asian Pacific Journal of Cancer Prevention. 2008 Jul-Sep; 9(3): 413-6en_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/37656
dc.language.isoengen_US
dc.source.urihttps://www.apocp.orgen_US
dc.titleSex and seasonal variations of plasma retinol, alpha-tocopherol, and carotenoid concentrations in Japanese dietitians.en_US
dc.typeJournal Articleen_US
dc.typeResearch Support, Non-U.S. Gov'ten_US
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