Whole-body protein turnover and nitrogen balance in young children at intakes of protein and energy in the region of maintenance
Hum Nutr Clin Nutr
; 37(6): 433-46, Dec. 1983.
Artigo
em Inglês
| MedCarib
| ID: med-9326
Biblioteca responsável:
JM3.1
ABSTRACT
Nitrogen balance and whole-body protein turnover were measured in children aged about one year taking diets which provided 1.7 or 0.7 g milk protein/kg/d at three levels of metabolizable energy, 80, 90 and 100 kcal/kg/d. All the children were in positive nitrogen balance at all levels of energy intake on 1.7 g protein/ kg/d. Nitrogen equilibrium was maintained on 0.7 g protein/kg/d when the energy intake exceeded 90 kcal/kg/d, but on 80 kcal/kg/d nitrogen balance was negative. Whole-body protein turnover was measured from the enrichment in urinary ammonia following a continuous infusion of15N-glycine. The variation between individuals on the same diet was significantly greater than the variation within individuals at different levels of energy intake. For the group as a whole protein synthesis on 1.7 g protein/kg/d was 0.74, 0.75 and 0.87 g N/kg/d on 100, 90 and 80 kcal/kg/d respectively;whereas on 0.7 g protein/kg/d it was 0.37, 0.38 and 0.40 g N/kg/d. These results show that over this range of intakes protein synthesis decreased as dietary protein fell, but tended to increase as energy intake fell. (AU)
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Base de dados:
MedCarib
Assunto principal:
Ingestão de Energia
/
Proteínas na Dieta
/
Proteínas
/
Alimentos Infantis
/
Nitrogênio
Limite:
Humanos
/
Lactente
/
Masculino
Idioma:
Inglês
Revista:
Hum Nutr Clin Nutr
Ano de publicação:
1983
Tipo de documento:
Artigo