Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Basal Metabolism”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 19 recordsLinked to original sources
PubMedDate not supplied

The functional significance of individual variation in basal metabolic rate.

Basal metabolic rate (BMR) was established as a common reference point allowing comparable measures across different individuals and species. BMR is often regarded as a minimal rate of metabolism compatible with basic processes necessary to sustain life. One confusing aspect, however, is that BMR is highly variable, both within and between species. A potential explanation for this variability is that while individuals with high BMRs may suffer the disadvantage of having to feed for longer to cover the extra energy demands, this may be offset by advantages that accrue because of the high metabolic rate. One suggested advantage is that high levels of BMR are a consequence of maintaining a morphology that permits high rates of the maximal sustained rate of metabolism (SusMR)--the rate of metabolism that can be sustained for days or weeks. We have been studying the energetics of MF1 laboratory mice during peak lactation to investigate this idea. In this article, we review some of our work in connection with three particular predictions that derive from the hypothesised links among morphology, basal metabolism, and sustained metabolic rate. By comparing groups of individuals, for example, lactating and nonlactating individuals, the patterns that emerge are broadly consistent with the hypothesis that BMR and SusMR are linked by morphology. Lactating mice have bigger organs connected with energy acquisition and utilisation, greater resting metabolic rates in the thermoneutral zone, called RMRt (approximately equivalent to BMR), and high sustainable rates of maximal energy intake. However, when attempts are made to establish these relationships across individuals within lactating mice, the associations that are anticipated are either absent or very weak and depend on shared variation due to body mass. At this level there is very little support for the suggestion that variation in RMRt (and thus BMR) is sustained by associations with SusMR.

Animals↗
PubMed1991

Body mass, maintenance and basal metabolism in dogs.

Basal metabolism and body mass are related by the metabolic power function: P = aMb, where P = basal metabolism in Watts, a = mass coefficient, M = body mass in kg, and b = mass exponent. The mass exponent of 117 dogs from the literature b dog = 0.885 +/- 0.024 (r = 0.960; F = 1387; df = 1,115). This mass exponent is significantly greater than the commonly accepted value of 0.75 for mammals. The dog's 95% confidence ellipse is compared with that of mammals with body mass (M) less than 3.2 kg (the lower limit of the mass range in dogs) and greater than 3.2 kg. When M greater than 3.2 kg the interspecific metabolic mass exponent (bi) in mammals is also significantly greater than 0.75 and not different from b dog (bi = 0.869 +/- 0.034; r = 0.919; F = 648; df = 1,120). In mammals M less than 3.2 kg bi is significantly smaller than 0.75 (bi = 0.634 +/- 0.010; r = 0.941; F = 4319; df = 1,561). These data show that in mammals the relationship between the logarithms of basal metabolism and body mass is not accurately described by a single regression line. They also indicate that the commonly accepted 0.75 mass exponent is not applicable to the prediction of basal metabolism in dogs and mammals. The relationship between body mass and maintenance energy metabolism (MEM) in 332 dogs shows that the prediction interval is too wide to reasonably predict MEM in individual dogs. However, the minimum maintenance energy metabolism (MMEM in Watts) can be accurately predicted by a simple algorithm: MMEM = 10.3 + 1.41 x M. The theoretical meaning of the basal metabolic power function is discussed.

Animals↗