Changes in respiratory quotient elicited in rats by a conditioned stimulus predicting food

Physiology & Behavior
I S McGregor, A M Lee

Abstract

The present study examined whether changes in energy expenditure and energy substrate utilization occur in rats exposed to a conditioned stimulus that signals food. In a differential conditioning procedure, rats were given conditioning sessions where one of two cues (either a flashing light or buzzer) predicted a carbohydrate-rich meal (CS+) while the other cue predicted no food (CS-). In two subsequent test sessions, indirect calorimetry was used to measure respiratory quotient, energy expenditure, and locomotor activity before, during, and after a 15-min CS+ or CS- presentation. The CS+ was found to significantly increase respiratory quotient, indicating a shift in the energy substrate being utilized toward carbohydrate. The CS+ also increased energy expenditure and locomotor activity, but these effects were more variable across rats. It is concluded that respiratory quotient may rise in anticipation of a carbohydrate-rich meal. Possible mechanisms underlying this effect are discussed.

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Citations

Dec 14, 1999·Behavioural Brain Research·E NsegbeJ Gallego
Oct 22, 2010·Nutrition Reviews·Paul A M SmeetsCees de Graaf
Nov 11, 2016·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Kevin DeightonKeelie Korsness
Jun 19, 2019·Nutrients·Genya OkadaHarushi Osugi

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