Document Detail


Relationship between vitamin D status, body composition and physical exercise of adolescent girls in Beijing.
MedLine Citation:
PMID:  18629568     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Little is known about the prevalence of actual vitamin D deficiency in healthy school-aged adolescents, particularly in China. The aim of this study was to examine the prevalence of hypovitaminosis D and to identify whether there was any association between vitamin D status, body composition and physical exercise in 323 Chinese adolescent girls in Beijing, China (40 degrees N). INTRODUCTION: It is well recognized that persistent severe vitamin D deficiency is associated with the bone abnormalities of rickets and osteomalacia. However, there is now evidence suggesting that low vitamin D status, not previously considered to be a state of deficiency is associated with secondary hyperparathyroidism, increased bone remodelling and other clinical signs thought only to be found in severe vitamin D deficiency. Hypovitaminosis D in healthy children and adolescents has been reported frequently in many countries, especially in winter. METHODS: We performed a cross-sectional analysis of 323 Chinese adolescent girls in Beijing in winter. Mean age of the subjects was 15.0 (+/-0.4) years. About 32.8%, 68.4% and 89.2% of the subjects were at risk of vitamin D deficiency when defined as plasma concentrations of 25OHD of 25, 37.5 or 50 nmol/L, respectively. RESULTS: This cross-sectional analysis of 323 Chinese adolescent girls in Beijing in winter showed that hypovitaminosis D was common in these subjects. In addition, body mass index, milk intake, participation in organized sports and total physical activity were all significant independent determinants of vitamin D status. An inverse association was found between plasma 25OHD and intact-parathyroid hormone (iPTH) concentration. Body mass index (BMI), milk intake, participation in organized sports and total physical activity all emerged as major independent determinants of vitamin D status as assessed by plasma 25OHD concentration. Vitamin D status was positively associated with lean body mass (LBM), but there was no association with the degree of body adiposity. Regardless of the concentration of 25OHD in blood used to define vitamin D deficiency, hypovitaminosis D was common in these subjects. CONCLUSION: It is recommended that policies be developed to prevent vitamin D deficiency in adolescent girls. Further studies are needed to identify the mechanisms whereby vitamin D status is related to exercise and to body composition during growth.
Authors:
L H Foo; Q Zhang; K Zhu; G Ma; A Trube; H Greenfield; D R Fraser
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-07-16
Journal Detail:
Title:  Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA     Volume:  20     ISSN:  1433-2965     ISO Abbreviation:  Osteoporos Int     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-02-11     Completed Date:  2010-02-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9100105     Medline TA:  Osteoporos Int     Country:  England    
Other Details:
Languages:  eng     Pagination:  417-25     Citation Subset:  IM    
Affiliation:
Faculty of Veterinary Science, University of Sydney, Sydney, NSW, Australia. lhfoo@kb.usm.my
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Body Composition / physiology*
Body Mass Index
Calcium / administration & dosage
China / epidemiology
Cross-Sectional Studies
Exercise / physiology*
Female
Humans
Motor Activity / physiology*
Parathyroid Hormone / blood
Prevalence
Risk Factors
Seasons
Vitamin D / administration & dosage,  analogs & derivatives,  blood*
Vitamin D Deficiency / epidemiology*
Chemical
Reg. No./Substance:
0/Parathyroid Hormone; 1406-16-2/Vitamin D; 64719-49-9/25-hydroxyvitamin D; 7440-70-2/Calcium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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