Calcium Accretion in Girls and Boys During Puberty: A Longitudinal Analysis

Bailey, D. A.; Martin, A. D.; McKay, Heather; Whiting, Susan J.; Mirwald, Robert L.

doi:10.1359/jbmr.2000.15.11.2245

Cited by 368 publications

(218 citation statements)

References 24 publications

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“…Firstly, daily calcium intake was not an explanation factor for all the analyzed bone sites, which can be the effect of a possible compensation mechanism between the trabecular and cortical bones in insufficient presence of calcium. In that mechanism, a type of bone "lends" the mineral from another to be compensated later, when the demand is balanced 24 , which corroborates other studies which suggest that the calcium consumption/supplementation acts in a specific manner for each bone site 5,11 . In addition to that, the insufficient calcium quantity must be also contributing to the weak associations found in the PAL and BMD, since the benefits induced by physical activity in the bone tissue during growth are only seen when the calcium intake is around 1,300mg per day 10 .…”

Section: Factors Related To Lifestylesupporting

confidence: 86%

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Densidade mineral óssea associada a características físicas e estilo de vida em adolescentes

Fonseca

Oliveira

Pereira

et al. 2012

Rev Bras Med Esporte

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Introduction: Just a few studies have evaluated physical traits, lifestyle and bone mineral density (BMD) acquisition in Brazilian female adolescents. Objective: To identify physical traits and lifestyle factors related to BMD in Brazilian female adolescents. Methods: 329 healthy adolescent girls aged between 10 and 20 years participated in this study. The physical characteristics evaluated were: body weight, stature, body mass index, pubertal stage, self-declared ethnicity and skin color. Concerning lifestyle, the following factors were evaluated: socioeconomic status (SES), physical activity level (PAL) and daily calcium intake. Additionally, total body, lumbar spine and femoral neck bone mineral density (BMD) was assessed by bone densitometry. Pearson's coefficient of correlation (r) and stepwise regression analysis were employed to check dependent and independent variables correlation (p ≤ 0.05). Results: Total body, lumbar spine and femoral neck BMD increase as body weight, height, BMI, age and pubertal stage increase (r ≥ 0.43; p<0.01). On the other hand, only SES (r = 0.14; p<0.05) and PAL (r = 0.12; p<0.05) were correlated. After stepwise regression, body weight, pubertal stage, age, height, calcium intake, SES, and PAL explained around 48-68% for BMD variation in female adolescents. Conclusion: The results suggest body weight, age and pubertal stage should be used as control variables for BMD variations in female adolescents. Furthermore, SES, PAL and daily calcium intake were less important than physical traits for BMD during adolescence.

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Section: Factors Related To Lifestylesupporting

confidence: 86%

“…Approximately 99% of the body calcium is stored in the bones 4 and about 26% of the calcium of an adult is acquired two year after the growth peak 24 , which denotes the importance of this nutrient for bone health. Therefore, the results which did not present significance in the present study should be carefully analyzed.…”

Section: Factors Related To Lifestylementioning

confidence: 99%

Densidade mineral óssea associada a características físicas e estilo de vida em adolescentes

Fonseca

Oliveira

Pereira

et al. 2012

Rev Bras Med Esporte

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“…(9,10,24,25) However, the morphological basis for this reduction has not been reported. The data presented here suggest the dissociation between growth in size and mineral accrual is accompanied by the occurrence of thinner cortex with lower cortical vBMD.…”

Section: Discussionmentioning

confidence: 96%

Rapid growth produces transient cortical weakness: A risk factor for metaphyseal fractures during puberty

Wang

Iuliano-Burns

et al. 2010

Journal of Bone and Mineral Research

109

100

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Fractures of the distal radius in children have a similar incidence to that found in postmenopausal women but occur more commonly in boys than in girls. Fractures of the distal tibia are uncommon in children and show no sex specificity. About 90% of lengthening of the radius but only 30% of lengthening of the tibia during puberty occur at the distal growth plate. We speculated that more rapid modeling at the distal radial metaphysis results in a greater dissociation between growth and mineral accrual than observed at the distal tibia. We measured the macro-and microarchitecture of the distal radial and tibial metaphysis using high-resolution peripheral quantitative computed tomography in a cross-sectional study of 69 healthy boys and 60 healthy girls aged from 5 to 18 years. Bone diameters were larger but total volumetric bone mineral density (vBMD) was lower at the distal radius (not at the distal tibia) by 20% in boys and by 15% in girls at Tanner stage III than in children of the same sex at Tanner stage I (both p < .05). In boys at Tanner stage III, total vBMD was lower because the larger radial total cross-sectional area (CSA) had a thinner cortex with lower vBMD than in boys at Tanner stage I. In girls at Tanner stage III, the larger total radial CSA was not associated with a difference in cortical thickness or cortical vBMD relative to girls in Tanner stage I. Cortical thickness and density at both sites in both sexes after Tanner stage III were greater than in younger children. Trabecular bone volume fraction (BV/TV) was higher in boys than in girls at both sites and more so after puberty because trabeculae were thicker in more mature boys but not in girls. There was no sex-or age-related differences in trabecular number at either site. We infer that longitudinal growth outpaces mineral accrual in both sexes at the distal radius, where bone grows rapidly. The dissociation produces transitory low cortical thickness and vBMD in boys but not in girls. These structural features in part may account for the site and sex specificity of metaphyseal fractures during growth. ß

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“…In pregnant adolescents, Ca is required for fetal bone formation (6) and for the continuous demand of the maternal skeleton, which is still growing (7) . During lactation, Ca is needed for maternal milk (8) .…”

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confidence: 99%

Changes in bone mineral density of adolescent mothers during the 12-month postpartum period

Malpeli¹,

Mansur²,

Santiago³

et al. 2009

Public Health Nutr.

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Objective: Bone mineral density (BMD) loss has been described in adult women in the 12-month postpartum period. However, little is known about the precise BMD pattern in adolescent mothers. The present study aimed to evaluate BMD in Argentinean adolescent mothers followed up during the 12-month postpartum period. Design: Analytical, prospective clinical trial. BMD and body composition were determined by dual-energy X-ray absorptiometry; bone mineral content (BMC) and BMD were measured in the lumbar spine (L2-L4), femoral neck (FN), femur trochanter (TR), total hip (TH) and total body. Changes in BMD and BMC were analysed using ANOVA for pairwise comparisons. Other comparisons were performed with the paired-sample t test and Wilcoxon test; Pearson's correlation coefficient was used to analyse the relationship among continuous variables. Setting: La Plata, Argentina. Subjects: Adolescent mothers (n 35; 17 years old or less) were recruited within 15 d after delivery. Studies and follow-up were performed at 15 d and 3, 6 and 12 months postpartum. Results: BMD and BMC losses at 3 and 6 months and recovery at 12 months fitted a quadratic curve (ANOVA) at the three sites studied (FN, TH, TR), in total-body BMD (P 5 0?000) and BMC (P 5 0?038). At hip sites, BMD loss occurred at 3 months (FN, P 5 0?000; TR, P 5 0?000; TH, P 5 0?000) and 6 months (FN, P 5 0?000; TR, P 5 0?000; TH, P 5 0?000) compared with basal values. Percentage BMD loss immediately after delivery up to 6 months was about 5 %. Conclusions: Adolescents showed significant BMD and BMC losses at 6 months postpartum, with an almost total recovery at 12 months in all sites studied.

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Calcium Accretion in Girls and Boys During Puberty: A Longitudinal Analysis

Cited by 368 publications

References 24 publications

Densidade mineral óssea associada a características físicas e estilo de vida em adolescentes

Densidade mineral óssea associada a características físicas e estilo de vida em adolescentes

Rapid growth produces transient cortical weakness: A risk factor for metaphyseal fractures during puberty

Changes in bone mineral density of adolescent mothers during the 12-month postpartum period

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