Effects of ageing on the energy balance of food‐restricted rats

Abstract

The mechanism of energy conservation takes place in all restricted animals and is very important for survival and for species preservation, mainly in aged animals in which food restriction is frequently aggravated by senescence-related organic disorders.

Exercício e restrição alimentar aumentam o RNAm de proteínas do trânsito de Ca2+ miocárdico em ratos

“…The reductions in body weight, RV weight and LV weight induced by FR are associated with the degree of caloric restriction. Food restriction, excessive intake or fasting state, change energy expenditure and body composition 25 . The reduction in energy expenditure during food restriction has been documented and represents a mechanism of energy conservation, which prevents excessive loss of body weight 25 .…”

“…Food restriction, excessive intake or fasting state, change energy expenditure and body composition 25 . The reduction in energy expenditure during food restriction has been documented and represents a mechanism of energy conservation, which prevents excessive loss of body weight 25 . The heart chambers were reduced in proportion to the reduction of body weight, as observed by the relations LV/BW and RV/BW.…”

“…The mechanism responsible for decreased plasma levels of thyroid hormones induced by FR may be related to the actual reduction in energy consumption. Reduced levels of thyroid hormones relate to the mechanism of energy conservation, since these hormones are mainly responsible for the energy expenditure 25 . Considering that energy expenditure is reduced in the food restriction, reduced levels of TH would be expected.…”

Effect of Food Restriction on Energy Expenditure of Monosodium Glutamate-Induced Obese Rats

“…Reduction in energy expenditure during fasting or food restriction is very well documented [11][12][13] and represents a mecha-nism of energy conservation, preventing excessive body weight loss [14] . We have demonstrated that this mechanism persists regardless of the species [15] , gender [11,16] , developmental stage [12] , pregnancy [11,13] and age [17] . We also demonstrated that this mechanism of energy conservation is rather dependent on the level of food restriction imposed [13] than on the way food restriction is imposed [18] .…”

Influência do tempo de exposição à obesidade sobre a função cardíaca de ratos

“…A variação no ganho de peso corporal é dependente da razão entre o consumo e gasto energético. O envelhecimento promove diminuição da taxa metabólica basal (153) e como conseqüência pode acarretar elevação da gordura corporal, desde que mantida o aporte energético. Neste sentido, o aumento da gordura corporal nos animais obesos entre 30 e 45 semanas foi decorrente da acentuação do processo de envelhecimento.…”