Sex and seasonal variations of plasma retinol, alpha-tocopherol, and carotenoid concentrations in Japanese dietitians.
dc.contributor.author | Xiang, Jin | en_US |
dc.contributor.author | Nagaya, Teruo | en_US |
dc.contributor.author | Huang, Xin-En | en_US |
dc.contributor.author | Kuriki, Kiyonori | en_US |
dc.contributor.author | Imaeda, Nahomi | en_US |
dc.contributor.author | Tokudome, Yuko | en_US |
dc.contributor.author | Sato, Juichi | en_US |
dc.contributor.author | Fujiwara, Nakako | en_US |
dc.contributor.author | Maki, Shinzo | en_US |
dc.contributor.author | Tokudome, Shinkan | en_US |
dc.date.accessioned | 2009-05-27T17:40:42Z | |
dc.date.available | 2009-05-27T17:40:42Z | |
dc.date.issued | 2008-07-08 | en_US |
dc.description | Asian Pacific Journal of Cancer Prevention. | en_US |
dc.description.abstract | AIM: 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.affiliation | Dept of Science Research, Jiangsu Cancer Hospital and Research Institute, Nanjing, China. | en_US |
dc.identifier.citation | Xiang 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): 413-6 | en_US |
dc.identifier.uri | https://imsear.searo.who.int/handle/123456789/37656 | |
dc.language.iso | eng | en_US |
dc.source.uri | https://www.apocp.org | en_US |
dc.title | Sex and seasonal variations of plasma retinol, alpha-tocopherol, and carotenoid concentrations in Japanese dietitians. | en_US |
dc.type | Journal Article | en_US |
dc.type | Research Support, Non-U.S. Gov't | en_US |
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