High respiratory quotient (RQ) has been associated with fat mass (FM) gain in some, but not all studies. Variability among results may reflect differences in the RQ variable measured (fasting vs. 24-h) or may be due to differences in control for factors that affect RQ, such as diet, energy balance, circulating insulin, and insulin sensitivity. The objective of this study was to determine whethe...

The goal of this study was to test whether the "loss of the complexity" hypothesis can be applied to compare the metabolic patterns of mouse models with known differences in metabolic and endocrine function as well as life span. Here, we compare the complexity of locomotor activity and metabolic patterns (energy expenditure, VO₂, and respiratory quotient) of the long-lived growth hormone recept...

Seven infants under one month of age with controlled congestive heart failure showed a mean oxygen consumption of 9-4 +/- 1-6 SD ml/kg per min, a mean respiratory quotient of 0-71 +/- 0-05 SD, and a mean metabolic rate of 63 +/- 12 SD cal/kg per 24 h. This compares with a group of infants with congenital heart disease not in heart failure with Vo2 of 6-5 +/- 1-2 SD ml/min per kg, respiratory qu...

PURPOSE The respiratory quotient (RQ) is useful for evaluating glucose and lipid metabolism in vivo. We previously reported that the RQ value, even after fasting, was high in diabetics being treated with sulphonylurea (SU), which might explain the accumulation of fat, leading to weight gain in such individuals. In the present study, we measured the RQ in type II diabetic patients who were being...

1. By means of a differential volumeter the increased oxygen consumption and the increased carbon dioxide output of frog nerve during and after stimulation have been observed. 2. Measurements of the R.Q. of nerve by this method are complicated by the retention of carbon dioxide. Attempts were made to avoid this (a) by studying the nerves at high CO(2) tensions to make the retention small and (b...

Continuously growing cultures of Chlorella pyrenoidosa Starr 252, operating at constant density and under constant environmental conditions, produced uniform photosynthetic quotient (PQ = CO(2)/O(2)) and O(2) values during 6 months of observations. The PQ for the entire study was 0.90 +/- 0.024. The PQ remained constant over a threefold light-intensity change and a threefold change in O(2) prod...

It is a generally accepted principle that the respiratory quotient is influenced by the composition of the food eaten, but the effect on it of the quantity of food seems to have been neglected. Occasional papers can be found which contain data showing an increase in R.Q. at higher intakes (e.g. Williams, Riche & LuSk, 1912; Forbes, Swift, Elliott & James, 1946)) but the levels used are too few ...

We investigated ventilation (V(.)E) control factors during recovery from light impulse-like exercise (100 watts) with a duration of 20 s. Blood ions and gases were measured at rest and during recovery. V(.)E, end tidal CO(2) pressure (PETCO(2)) and respiratory exchange ratio (RER) were measured continuously during rest, exercise and recovery periods. Arterial CO(2) pressure (PaCO(2) (pre) was e...