著者
Masaatsu MIYAUCHI Chizuko HIRAI Hideaki NAKAJIMA
出版者
Center for Academic Publications Japan
雑誌
Journal of Nutritional Science and Vitaminology (ISSN:03014800)
巻号頁・発行日
vol.59, no.4, pp.257-263, 2013 (Released:2013-09-24)
参考文献数
21
被引用文献数
16 17

Although the importance of solar radiation for vitamin D3 synthesis in the human body is well known, the solar exposure time required to prevent vitamin D deficiency has not been determined in Japan. This study attempted to identify the time of solar exposure required for vitamin D3 synthesis in the body by season, time of day, and geographic location (Sapporo, Tsukuba, and Naha) using both numerical simulations and observations. According to the numerical simulation for Tsukuba at noon in July under a cloudless sky, 3.5 min of solar exposure are required to produce 5.5 μg vitamin D3 per 600 cm2 skin corresponding to the area of a face and the back of a pair of hands without ingestion from foods. In contrast, it took 76.4 min to produce the same quantity of vitamin D3 at Sapporo in December, at noon under a cloudless sky. The necessary exposure time varied considerably with the time of the day. For Tsukuba at noon in December, 22.4 min were required, but 106.0 min were required at 09:00 and 271.3 min were required at 15:00 for the same meteorological conditions. Naha receives high levels of ultraviolet radiation allowing vitamin D3 synthesis almost throughout the year.

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日照量の調査から、十分なビタミンDを生成するために必要な日照暴露時間は、7月はまあ日本どこでもだいたい5-10分に対し、12月の札幌では2741分必要(ほぼ2日ずっと外にいないといけない) https://t.co/AvGkc5y32L
#あさイチ 骨を作るための紫外線量について、話題になっていたビタミンD(活性型ビタミンD3)と日光曝露の論文(PDF) https://t.co/S5hbtvpKAj ここのReferenceから様々な論文へたどれそう。日本語で読… https://t.co/USEn3Inh3r
日照時間とビタミンD 那覇、つくば、札幌の比較。 https://t.co/BOwdXkAWql

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