The effect of aging on energy regulation remains controversial. We compared the effects of underfeeding on changes in energy expenditure and respiratory quotient in young normal weight men and women [YNW, age 25.7 +/- 3.2 y(SD), body mass index (BMI) 23.1 +/- 1.6 kg/m(2)], young overweight men and women (YOW, age 26.1 +/- 3.5 y, BMI 27.7 +/- 2.1 kg/m(2)) and older (OLD) men and women (age 68.4 ...

The mechanisms underlying the change in phenotype from metabolically healthy to metabolically unhealthy obesity are still unclear. The aim of this study is to investigate whether a difference in fasting fat utilization exists between overweight/obese individuals with a favorable cardiovascular risk profile and those with Metabolic Syndrome and Type 2 diabetes. Furthermore, we sought to explore ...

Circumstantial evidence suggests that substitution of glucose or sucrose by the low-glycaemic index sugar galactose in the diet may lead to greater thermogenesis and/or fat oxidation. Using ventilated hood indirect calorimetry, we investigated, in twelve overnight-fasted adults, the resting energy expenditure (REE) and respiratory quotient (RQ) for 30 min before and 150 min after ingestion of 5...

We measured the oxygen consumption (QO2) of lung slices from rats and rabbits and the respiratory quotient (RQ) of lung slices from fed and fasted rats. The QO2 of lung slices is lowered within 24 h after the onset of food deprivation; this decrease in QO2 lasts during at least 2 additional days of fasting and is not eliminated by addition of glucose to the reaction medium. In fed rats the RQ o...

Hamidu, J.A., J.J.R. Feddes, C.A. Ouellette and G.M. Fasenko. 2010. Measurement of avian embryo respiration by an indirect calorimetric system. Canadian Biosystems Engineering/Le génie des biosystèmes au Canada. 52: 4.9 4.14. Accurate measurement of embryonic respiration can be used to determine the viability of the chicken embryo and the chick upon hatching. This measurement is based on both t...

Segura, J.C., Ouellette C., Feddes J.J.R., Fasenko G.M. and Zuidhof M.J. 2006. Development of a metabolic calorimeter system to measure heat production of domestic avian embryos during incubation. Canadian Biosystems Engineering/Le génie des biosystèmes au Canada 48: 4.1 4.6. A metabolic calorimeter system was developed to facilitate collection of metabolic data from 24 embryos within an incuba...

1. The respiration of Amoeba proteus was measured. 10 c. mm. of cells were found to use about 1.6 mm.(3) of oxygen per hour at 20 degrees C. The respiratory quotient was found to be nearly unity. 2. No anaerobic metabolism was found for Amoeba. 3. The respiration of Blepharisma was found to be from 3 to 7 mm.(3) oxygen per hour for 10 mm.(3) cells. The respiratory quotient was about 1. 4. Bleph...