Relative brain size and basal metabolic rate in terrestrial vertebrates

Nature ◽  
1981 ◽  
Vol 293 (5827) ◽  
pp. 57-60 ◽  
Author(s):  
R. D. Martin
Keyword(s):  
Metabolic Rate ◽  
Basal Metabolic Rate ◽  
Brain Size ◽  
Terrestrial Vertebrates ◽  
Relative Brain Size

Intraspecific Energetic Trade-Offs and Costs of Encephalization Vary from Interspecific Relationships in Three Species of Mormyrid Electric Fishes

2019 ◽  
Vol 93 (4) ◽  
pp. 196-205
Author(s):  
Kimberley V. Sukhum ◽  
Megan K. Freiler ◽  
Bruce A. Carlson
Keyword(s):  
Metabolic Rate ◽  
Brain Size ◽  
Hypoxia Tolerance ◽  
Energetic Cost ◽  
Interspecific Relationship ◽  
Interspecific Relationships ◽  
Physiological Constraints ◽  
Trade Offs ◽  
Relative Brain Size ◽  
Intraspecific Relationships

The evolution of increased encephalization comes with an energetic cost. Across species, this cost may be paid for by an increase in metabolic rate or by energetic trade-offs between the brain and other energy-expensive tissues. However, it remains unclear whether these solutions to deal with the energetic requirements of an enlarged brain are related to direct physiological constraints or other evolved co-adaptations. We studied the highly encephalized mormyrid fishes, which have extensive species diversity in relative brain size. We previously found a correlation between resting metabolic rate and relative brain size across species; however, it is unknown how this interspecific relationship evolved. To address this issue, we measured intraspecific variation in relative brain size, the sizes of other organs, metabolic rate, and hypoxia tolerance to determine if intraspecific relationships between brain size and organismal energetics are similar to interspecific relationships. We found that 3 species of mormyrids with varying degrees of encephalization had no intraspecific relationships between relative brain size and relative metabolic rate or relative sizes of other organs, and only 1 species had a relationship between relative brain size and hypoxia tolerance. These species-specific differences suggest that the interspecific relationship between metabolic rate and relative brain size is not the result of direct physiological constraints or strong stabilizing selection, but is instead due to other species level co-adaptations. We conclude that variation within species must be considered when determining the energetic costs and trade-offs underlying the evolution of extreme encephalization.

scholarly journals Scaling of the Mammalian Brain: the Maternal Energy Hypothesis

Physiology ◽  
1996 ◽  
Vol 11 (4) ◽  
pp. 149-156 ◽  
Author(s):  
RD Martin
Keyword(s):  
Body Size ◽  
Metabolic Rate ◽  
Basal Metabolic Rate ◽  
Brain Size ◽  
Developing Brain ◽  
Correlation Network ◽  
Gestation Period ◽  
Mammalian Brain ◽  
Metabolic Capacity ◽  
Simple Scaling

Mammalian brain sizes have been linked to specific behavioral or physiological features because of simple scaling correlations. Examination of the correlation network for body size, brain size, basal metabolic rate, and gestation period indicates that the primary link is between maternal metabolic capacity and the developing brain of the offspring.

scholarly journals Evolution of basal metabolic rate in bank voles from a multidirectional selection experiment

2015 ◽  
Vol 282 (1806) ◽  
pp. 20150025 ◽  
Author(s):  
Edyta T. Sadowska ◽  
Clare Stawski ◽  
Agata Rudolf ◽  
Geoffrey Dheyongera ◽  
Katarzyna M. Chrząścik ◽  
...  
Keyword(s):  
Metabolic Rate ◽  
Basal Metabolic Rate ◽  
Positive Association ◽  
Interspecific Variation ◽  
Myodes Glareolus ◽  
Major Theme ◽  
Selection Experiment ◽  
Predatory Behaviour ◽  
Terrestrial Vertebrates ◽  
Rate Of Oxygen Consumption

A major theme in evolutionary and ecological physiology of terrestrial vertebrates encompasses the factors underlying the evolution of endothermy in birds and mammals and interspecific variation of basal metabolic rate (BMR). Here, we applied the experimental evolution approach and compared BMR in lines of a wild rodent, the bank vole ( Myodes glareolus ), selected for 11 generations for: high swim-induced aerobic metabolism (A), ability to maintain body mass on a low-quality herbivorous diet (H) and intensity of predatory behaviour towards crickets (P). Four replicate lines were maintained for each of the selection directions and an unselected control (C). In comparison to C lines, A lines achieved a 49% higher maximum rate of oxygen consumption during swimming, H lines lost 1.3 g less mass in the test with low-quality diet and P lines attacked crickets five times more frequently. BMR was significantly higher in A lines than in C or H lines (60.8, 56.6 and 54.4 ml O 2 h −1 , respectively), and the values were intermediate in P lines (59.0 ml O 2 h −1 ). Results of the selection experiment provide support for the hypothesis of a positive association between BMR and aerobic exercise performance, but not for the association of adaptation to herbivorous diet with either a high or low BMR.

Development of new predictive equations for basal metabolic rate in Iranian healthy adults: negligible effect of sex

2020 ◽  
pp. 1-10
Author(s):  
Bahareh Nikooyeh ◽  
Nastaran Shariatzadeh ◽  
Ali Kalayi ◽  
Maliheh Zahedirad ◽  
Tirang R. Neyestani
Keyword(s):  
Metabolic Rate ◽  
Thyroid Function ◽  
Basal Metabolic Rate ◽  
Age Groups ◽  
Thyroid Function Tests ◽  
Anthropometric Measures ◽  
Predictive Equations ◽  
Normal Thyroid Function ◽  
Asian People ◽  
Predictive Formulas

Abstract. Some studies have reported inaccuracy of predicting basal metabolic rate (BMR) by using common equations for Asian people. Thus, this study was undertaken to develop new predictive equations for the Iranian community and also to compare their accuracy with the commonly used formulas. Anthropometric measures and thyroid function were evaluated for 267 healthy subjects (18–60 y). Indirect calorimetry (InCal) was performed only for those participants with normal thyroid function tests (n = 252). Comparison of predicted RMR (both kcal/d and kcal.kg.wt−1.d−1) using current predictive formulas and measured RMR revealed that Harris-Benedict and FAO/WHO/UNU significantly over-estimated and Mifflin-St. Jeor significantly under-estimated RMR as compared to InCal measurements. In stepwise regression analysis for developing new equations, the highest r2 (=0.89) was from a model comprising sex, height and weight. However, further analyses revealed that unlike the subjects under 30 y, the association between age and the measured RMR in subjects 30 y and plus was negative (r = −0.241, p = 0.001). As a result, two separate equations were developed for these two age groups. Over 80 percent of variations were covered by the new equations. In conclusion, there were statistical significant under- and over-estimation of RMR using common predictive equations in our subjects. Using the new equations, the accuracy of the calculated RMR increased remarkably.

COMBINATION OF POTASSIUM PERCHLORATE AND PROPYLTHIOURACIL IN THE TREATMENT OF THYROTOXICOSIS

1968 ◽  
Vol 57 (4) ◽  
pp. 565-577 ◽  
Author(s):  
K. E. Røkke ◽  
J. H. Vogt
Keyword(s):  
Drug Therapy ◽  
Side Effects ◽  
Metabolic Rate ◽  
Total Cholesterol ◽  
Basal Metabolic Rate ◽  
Combined Therapy ◽  
Combined Treatment ◽  
Control Measures ◽  
Potassium Perchlorate ◽  
Plasma Total Cholesterol

ABSTRACT A report is given on 95 thyrotoxic patients treated with a combination of 400 mg propylthiouracil and 400 mg of potassium perchlorate. Perchlorate was stopped when a marked remission of symptoms was obtained, on an average after less than 7 weeks. Euthyroidism was found on an average after 7.2 weeks. The basal metabolic rate, PBI, plasma total cholesterol and weight showed a fairly rapid normalization. Thirteen of the 95 patients were given radio-iodine therapy shortly before drug therapy was started. The remaining 82 cases were grouped together with the 23 cases previously reported. Of the total of 105 cases, 96 became euthyroid on combined therapy. For the frequency of side-effects, the thirteen cases mentioned above were included, giving a total of 118 cases. Eight cases showed an increase in goitre size and 15 cases had other side-effects, of which three were granulocytopenia due to propylthiouracil. The possibility of a higher frequency of mainly minor side-effects on combined therapy has to be balanced against the seemingly rapid and reliable therapeutic effect. Combined treatment, perhaps with even smaller doses than reported here, can be recommended in selected cases of thyrotoxicosis where a shortening of the thyrotoxic state seems of importance, or possibly where difficulties due to iodine exposure may be anticipated, provided adequate control measures are taken.

Can night eating syndrome increase basal metabolic rate?

2017 ◽  
Author(s):  
Senay Topsakal ◽  
Guzin Fidan Yaylalı ◽  
Semin Melahat Fenkci
Keyword(s):  
Metabolic Rate ◽  
Basal Metabolic Rate ◽  
Night Eating Syndrome ◽  
Night Eating

Metabolic Age, an Index Based on Basal Metabolic Rate, Can Predict Individuals That are High Risk of Developing Metabolic Syndrome

2021 ◽  
Author(s):  
Sarahi Vásquez-Alvarez ◽  
Sergio K. Bustamante-Villagomez ◽  
Gabriela Vazquez-Marroquin ◽  
Leonardo M. Porchia ◽  
Ricardo Pérez-Fuentes ◽  
...  
Keyword(s):  
Metabolic Syndrome ◽  
High Risk ◽  
Metabolic Rate ◽  
Basal Metabolic Rate ◽  
Metabolic Age

scholarly journals The decoupled nature of basal metabolic rate and body temperature in endotherm evolution

Nature ◽  
2019 ◽  
Vol 572 (7771) ◽  
pp. 651-654 ◽  
Author(s):  
Jorge Avaria-Llautureo ◽  
Cristián E. Hernández ◽  
Enrique Rodríguez-Serrano ◽  
Chris Venditti
Keyword(s):  
Body Temperature ◽  
Metabolic Rate ◽  
Basal Metabolic Rate
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