Bone mineral density, body composition, and food intake of adolescent runway models

Abstract

Objective: To evaluate the bone mineral density (BMD) and to relate it to the food intake and body composition of adolescent runway models.Methods: Cross-sectional study evaluating 33 models and 33 nonmodels aged from 15 to 18 years, paired by age and body mass index (BMI). BMD of spine (L1-L4) was evaluated using the dual-energy X-ray absorptiometry technique (Lunar  DPX Alpha), and body composition was assessed by mean of plethysmography. Food intake was evaluated by a 3-day-food record. Results:The subjects' mean age was 16.75±1.04 years, and 24% had BMI below ideal value for their age. BMD values (g/cm 2 ) were similar between models (1.108±0.080) and non-models (1.096±0.102) (p > 0.05), and 6% of the participants had low BMD for age. We found that the mean energy intake was lower among models as compared to non-models (1,480.93±582.95 vs. 1,973.00±557.63 kcal) (p < 0.05) and that most of the adolescents in both groups presented an inadequate consumption of micronutrients, with emphasis to the low calcium intakes. There was only significant correlation between BMD and lean body mass (kg) (r = 0.362 for models and r = 0.618 for non-models) (p < 0.05). Conclusion:Although no association was found between BMD, BMI, and intake of nutrients which are important for the bone mineralization process, inadequacies of food intake have an adverse influence on the acquisition of bone mass, which is more effective at this stage of life.J Pediatr (Rio J). 2009;85(6): 503-508: Adolescents, bone mineral density, nutritional status, dietary intake. ResumoObjetivo: Avaliar a densidade mineral óssea (DMO) e relacioná-la com a ingestão alimentar e composição corporal de adolescentes modelos de passarela.Métodos: Estudo transversal avaliando 33 modelos e 33 não modelos de 15 a 18 anos pareadas por idade e índice de massa corporal (IMC). A densidade mineral óssea da coluna (L1-L4) foi avaliada por meio da técnica da absorciometria de feixe duplo de energia (Lunar  DPX Alpha), e a composição corporal, pela técnica de pletismografia. A ingestão alimentar foi avaliada por meio do registro alimentar de 3 dias.Resultados: A média de idade das adolescentes foi de 16,75±1,04 anos, sendo que 24% apresentaram IMC abaixo dos valores ideais para a idade. Não houve diferença de DMO entre modelos (1,108±0,080 g/cm 2 ) e não modelos (1,096±0,102 g/cm 2 ) (p > 0,05), sendo identificada uma porcentagem de 6% de baixa DMO para a idade. Observou-se que a média de ingestão de energia foi menor entre as modelos em comparação às adolescentes não modelos (1.480,93±582,95 versus 1.973,00±557,63 kcal) (p < 0,05) e que a maioria das adolescentes de ambos os grupos apresentou consumo inadequado de micronutrientes, ressaltando-se a baixa ingestão de cálcio. Verificou-se correlação significativa da DMO apenas com a massa magra (kg) (modelos r = 0,362 e não modelos r = 0,618; p < 0,05).Conclusão: Apesar de não ter sido encontrada associação entre a DMO, o IMC e a ingestão de nutrientes importantes no processo de mineralização óssea, as inadequações ...

Lactose Malabsorption, Calcium Intake, and Bone Mass in Children and Adolescents

“…To this end, it was verified that the eating standard of Brazilians in relation to dairy products could contribute to a low calcium intake, which was confirmed in the present study, within which it was observed that the greater part of the children and early adolescents presented calcium intake lower than the recommendation. This low ingestion also occurred in other Brazilian studies involving populations of children (43,45) and adults (46,47). On directly analyzing the relation between calcium intake and the z score of bone mineral density of the participants in the present study, no significant correlation was verified, a result similar to that obtained in another study involving Brazilian adolescents with low calcium intake (45).…”

“…This low ingestion also occurred in other Brazilian studies involving populations of children (43,45) and adults (46,47). On directly analyzing the relation between calcium intake and the z score of bone mineral density of the participants in the present study, no significant correlation was verified, a result similar to that obtained in another study involving Brazilian adolescents with low calcium intake (45). Consequently, studies that evaluate both Brazilian children's and adolescents' bone mass involving different levels of calcium intake are necessary.…”

Consumo alimentar e perfil antropométrico de adolescentes tenistas

“…Em relação ao mineral cálcio, verificou-se que a ingestão diária dos adolescentes não alcançou as recomendações mínimas em ambas as faixas etárias. Rodrigues et al (2009) relatam que, além da massa corporal, destaca-se, em termos nutricionais, a importante inter-relação entre consumo alimentar e a massa óssea. O período da infância e da adolescência é marcado por uma taxa de formação óssea muito importante, com predomínio da formação sobre a reabsorção (SILVA et al, 2004).…”

Preliminary Evidence of an Association Between ADHD Medications and Diminished Bone Health in Children and Adolescents

“…Consistent with prior research, agespecific and sex-specific z score standardized BMD measures were calculated for use in subsequent analyses. [25][26][27][28][29][30][31] Prescription Medication, Demographic, and Socioeconomic Measures Data on prescription medication was based on responses to the following questionnaire item: "In the past month have you used or taken medication for which a prescription is needed?" followed by the opportunity to list medications.…”