Document Detail


The effects of nutrition, puberty and dancing on bone density in adolescent ballet dancers.
MedLine Citation:
PMID:  21703093     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Ballet dancers have on average a low bone mineral content (BMC), with elevated fracture-risk, low body mass index (BMI) for age (body mass index, kg/m2), low energy intake, and delayed puberty. This study aims at a better understanding of the interactions of these factors, especially with regard to nutrition. During a competition for pre-professional dancers we examined 127 female participants (60 Asians, 67 Caucasians). They averaged 16.7 years of age, started dancing at 5.8 years, and danced 22 hours/week. Assessments were made for BMI, BMC (DXA), and bone mineral apparent density (BMAD) at the lumbar spine and femoral neck, pubertal stage (Tanner score), and nutritional status (EAT-40 questionnaire and a qualitative three-day dietary record). BMI for age was found to be normal in only 42.5% of the dancers, while 15.7% had a more or less severe degree of thinness (12.6% Grade2 and 3.1% Grade 3 thinness). Menarche was late (13.9 years, range 11 to 16.8 years). Food intake, evaluated by number of consumed food portions, was below the recommendations for a normally active population in all food groups except animal proteins, where the intake was more than twice the recommended amount. In this population, with low BMI and intense exercise, BMC was low and associated with nutritional factors; dairy products had a positive and non-dairy proteins a negative influence. A positive correlation between BMAD and years since menarche confirmed the importance of exposure to estrogens and the negative impact of delayed puberty. Because of this and the probable negative influence of a high intake of non-dairy proteins, such as meat, fish, and eggs, and the positive association with a high dairy intake, ballet schools should promote balanced diets and normal weight and should recognize and help dancers avoid eating disorders and delayed puberty caused by extensive dancing and inadequate nutrition.
Authors:
Peter Burckhardt; Emma Wynn; Marc-Antoine Krieg; Carlo Bagutti; Mohamed Faouzi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dance medicine & science : official publication of the International Association for Dance Medicine & Science     Volume:  15     ISSN:  1089-313X     ISO Abbreviation:  J Dance Med Sci     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-06-27     Completed Date:  2011-10-27     Revised Date:  2012-04-11    
Medline Journal Info:
Nlm Unique ID:  9700066     Medline TA:  J Dance Med Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  51-60     Citation Subset:  IM    
Affiliation:
Clinique Bois-Cerf, Osteoporosis Consultation, Lausanne, Switzerland. p_burckhardt@bluewin.ch
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MeSH Terms
Descriptor/Qualifier:
Adult
Anthropometry
Asian Continental Ancestry Group
Body Weights and Measures
Bone Density / physiology*
Dancing / physiology*
Diet*
European Continental Ancestry Group
Female
Humans
Menarche / physiology
Puberty / physiology*

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


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