The effect of fasting and refeeding on oxygen consumption by rats
Braz. j. med. biol. res
;
25(2): 205-8, 1992. tab, ilus
Artigo
em Inglês
| LILACS
| ID: lil-109020
RESUMO
Oxygen consumption is usually measured on fasted animals to avoid the thermal effect of feeding. However, fasting itself may decrease oxyge consumption as a way of conserving energy. The present study was undertaken to determine how long the fasting period should be to avoid the thermal effect of feeding without promoting a further decrease in oxygen consumption by the activation of energy-conservation mechanisms. Oxygen consumption was also measured to evaluate the effect of refeeding after different fasting periods. There was a 16% decrease in oxygen consumption from 0 to 12 h fasting related to the thermal effect of feeding, followed by a less intense (12%) decrease from 12 to 48 h fasting resulting from the energy conservationn mechanism. During refeeding, oxygen consumption was higher during the first 30-min period than during the last 30-min period of the 1-h measurement, indicating the probable presence of a cephalic phase of postprandial thermogenesis. We conclude that 12-h fasting is the most appropriate period to avoid the thermal effect of feeding without significantly stimulating the energy conservation mechanism
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Índice:
LILACS (Américas)
Assunto principal:
Consumo de Oxigênio
/
Jejum
/
Temperatura Baixa
/
Ingestão de Alimentos
/
Metabolismo Energético
/
Temperatura Alta
Limite:
Animais
Idioma:
Inglês
Revista:
Braz. j. med. biol. res
Assunto da revista:
Biologia
/
Medicina
Ano de publicação:
1992
Tipo de documento:
Artigo
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