Factors affecting changes in the serum levels of 25-hydroxyvitamin D: a 3-year follow-up of the ROAD study.
Osteoporos Int. 2015 Jun 19. DOI: 10.1007/s00198-015-3184-0
Yoshimura N1, Muraki S, Oka H, Tanaka S, Kawaguchi H, Nakamura K, Akune T.
1Department of Joint Disease Research, 22nd Century Medical and Research Center, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan, YOSHIMURAN-ORT@h.u-tokyo.ac.jp.
In this 3-year population-based cohort study, among 1346 subjects, the mean annual change in the serum 25-hydroxyvitamin D levels was 7.6 %/year, which tended to increase during the 3-year period. Multivariate regression analysis indicated that the L2-4 bone mineral density and total daily energy intake were significant independent associated factors.
INTRODUCTION:
The aim of this study was to clarify the change rate of the serum levels of 25-hydroxyvitamin D (25D) and the associated factors in a general Japanese population during a 3-year period.
METHODS:
The baseline survey of Research on Osteoarthritis/osteoporosis Against Disability study (ROAD), a large-scale population-based cohort study, was performed between 2005 and 2007, and a follow-up survey was repeated 3 years later. Among 1690 participants at baseline, the change rate of the serum 25D levels were assessed in 1346 individuals (79.6 %; 458 men and 888 women) who completed measurements of 25D at both the baseline and follow-up examinations. The change rate was calculated, and the factors associated with the changes in the 25D levels were determined using multivariate regression analysis after adjustment for age, gender, body mass index, participated month, and regional differences at baseline.
RESULTS:
The mean (standard deviation) change rate of the 25D levels in all subjects was 7.6 (13.3) %/year (men, 8.2 [12.4] %/year; women, 7.3 [13.7] %/year). Multivariate regression analysis indicated that higher bone mineral density at lumbar spine L2-4 (p = 0.05) and total daily energy intake (p = 0.04) were significantly associated with the change rate of the 25D levels.
CONCLUSIONS:
The serum levels of 25D tended to increase over the 3-year period, and higher lumbar bone mineral density and daily energy intake were found to be associated with increases in the 25D levels over time.
Download the PDF from sci-hub via VitaminDWiki
Many seniors around the world have started vitamin D supplementation
- 20X increase in vitamin D sold and 36 percent decrease in osteoporosis business in Australia – Nov 2013
- VITAMIN D: Public Shouldn’t Wait For Doctors To Usher In New “Golden Era” Of Preventive Medicine
- Vitamin D supplementation in Ireland - big increase in people with 20-50 nanograms in 20 years – June 2015
- Many more people now have vitamin D levels above 50 ng, especially seniors – May 2015 has the following chart