| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2014: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2012: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Outline of Final Research Achievements |
Vitamin D (VD) insufficiency is a concern, particularly among young Japanese females. VD status shows seasonal variations, since it correlates with duration of sunlight exposure. VD insufficiency in indoor athletes is therefore suggested in winter. The purpose of this study was to determine seasonal variations in VD and bone status among in- and outdoor Japanese female college athletes.
We conducted a prospective cohort study of Japanese female college athletes . Biochemical markers and bone parameters were measured in March, June, September and December. Serum 25-hydroxyvitamin D (25-OH-D) concentration showed a seasonal oscillation, with a nadir in March and a peak in September. The amplitude of oscillation was greater among indoor athletes than among outdoor athletes. The nadir in bone mass measured as speed of sound occurred in June after peaking in December among both indoor and outdoor athletes. The pattern followed 3 months after changes in 25-OH-D.
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