Whole body bone mineral accretion in healthy children and adolescents

Data on accretion in bone size and bone mineral content (BMC) are needed to evaluate bone mineralisation during childhood. Whole body bone mineral content (BMC) and bone area (BA) were determined by dual energy x ray absorptiometry (Hologic 1000/W) with a one year interval in healthy girls (n = 192)...

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Veröffentlicht in:Archives of disease in childhood 1999-07, Vol.81 (1), p.10-15
Hauptverfasser: Mølgaard, Christian, Thomsen, Birthe Lykke, Michaelsen, Kim Fleischer
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description Data on accretion in bone size and bone mineral content (BMC) are needed to evaluate bone mineralisation during childhood. Whole body bone mineral content (BMC) and bone area (BA) were determined by dual energy x ray absorptiometry (Hologic 1000/W) with a one year interval in healthy girls (n = 192) and boys (n = 140) aged 6–19 years. Annual accretion in BMC (ΔBMC (g/year)) and BA (ΔBA (cm2/year)) according to sex and pubertal stages were calculated. ΔBA and ΔBMC were highly significantly associated with pubertal stages in girls and boys. Centile curves for ΔBA and ΔBMC according to sex and age were constructed using the LMS method. Peak ΔBA and ΔBMC values were reached earlier in girls (12.3 and 12.5 years, respectively) than in boys (13.4 and 14.2 years, respectively). The ΔBA peak was dissociated in time from the ΔBMC peak, indicating that increase in bone size occurs before increase in bone mineral content. Assuming that 32.2% of BMC consist of calcium, the median (90th centile) annual bone calcium accretion in pubertal stage III was 220 mg/day (302) and 317 mg/day (386) for girls and boys, respectively. To obtain an average bone calcium accretion, a high calcium absorption is needed during puberty. This may have implications for dietary calcium requirements at this time.
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Whole body bone mineral content (BMC) and bone area (BA) were determined by dual energy x ray absorptiometry (Hologic 1000/W) with a one year interval in healthy girls (n = 192) and boys (n = 140) aged 6–19 years. Annual accretion in BMC (ΔBMC (g/year)) and BA (ΔBA (cm2/year)) according to sex and pubertal stages were calculated. ΔBA and ΔBMC were highly significantly associated with pubertal stages in girls and boys. Centile curves for ΔBA and ΔBMC according to sex and age were constructed using the LMS method. Peak ΔBA and ΔBMC values were reached earlier in girls (12.3 and 12.5 years, respectively) than in boys (13.4 and 14.2 years, respectively). The ΔBA peak was dissociated in time from the ΔBMC peak, indicating that increase in bone size occurs before increase in bone mineral content. Assuming that 32.2% of BMC consist of calcium, the median (90th centile) annual bone calcium accretion in pubertal stage III was 220 mg/day (302) and 317 mg/day (386) for girls and boys, respectively. To obtain an average bone calcium accretion, a high calcium absorption is needed during puberty. This may have implications for dietary calcium requirements at this time.</abstract><cop>London</cop><pub>BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health</pub><pmid>10373125</pmid><doi>10.1136/adc.81.1.10</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record>
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subjects Absorptiometry, Photon
Accretion
Adolescent
Adolescents
Age
Age Factors
Anthropometry
Biological and medical sciences
Bone density
Bone Development - physiology
bone growth
bone mineral content
Bones
Calcification, Physiologic - physiology
Calcium
Case Studies
Child
Child development
Children & youth
Cross-Sectional Studies
dual energyx ray absorptiometry
Female
Follow-Up Studies
Humans
Hydroxyapatite
Investigative techniques, diagnostic techniques (general aspects)
Longitudinal Studies
Male
Medical sciences
Mineralization
Original
Osteoarticular system. Muscles
Osteoporosis
Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques
Puberty
Puberty - physiology
R&D
Reference Values
Research & development
Retention
Sex Characteristics
Studies
Teenagers
title Whole body bone mineral accretion in healthy children and adolescents
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