Basal metabolic rate scaled to body mass between species by the fractal dimension of the vascular system and body composition

dc.contributor.authorRoux, Carl Z.
dc.contributor.emailcarl.roux@up.ac.zaen_ZA
dc.date.accessioned2017-07-27T08:50:48Z
dc.date.available2017-07-27T08:50:48Z
dc.date.issued2017
dc.description.abstractExercise-induced maximum aerobic metabolic rate (MMR) is related to the fractal dimension (D) of the self-similar vascular blood transport system by a whole body mass (Mw) power with exponent b of the form b = D/3. The principle of self-similarity of the vascular system is in agreement with each organ in the body having a major artery supplying it with blood from the heart and a major vein returning it. This implies that the whole body fractal vascular dimension D is also applicable to all organs or collections of organs such as the viscera and skeletal muscle. The principal reason that basal metabolic rate (BMR) and MMR scale with different power exponents to whole body mass is that MMR is due mainly to respiration in skeletal muscle during exercise and BMR to respiration in the viscera during rest. It follows, therefore, from the self-similarity of the vascular system that BMR is related to viscera mass (Mv) in the same way that MMR is related to muscle mass. Hence, BMR scales to Mv with exponent b and, additionally, if Mv scales to Mw with exponent d, then BMR will scale with Mw with exponent bd, where bd = b2 for b = d. Here this approach is justified by an assessment of the scaling of viscera and its components with total body mass. The applicability of fractal vascular scaling to the sum of visceral organ metabolic rate contributions is confirmed from organ tissue slices, mitochondrial surface areas, and blood oxygen transport. Estimates obtained from oxygen half-saturation partial pressure scaling exponents show that BMR scaling with b2 is of general occurrence between species.en_ZA
dc.description.departmentGeneticsen_ZA
dc.description.librarianam2017en_ZA
dc.description.sponsorshipThe University of Pretoria and the National Research Foundation grant nr 95880.en_ZA
dc.description.urihttp://www.sasas.co.za/journalsen_ZA
dc.identifier.citationRoux, CZ 2017, 'Basal metabolic rate scaled to body mass between species by the fractal dimension of the vascular system and body composition', South African Journal of Animal Science, vol. 47, no. 3, pp. 246-254.en_ZA
dc.identifier.issn0375-1589
dc.identifier.other10.4314/sajas.v47i3.1
dc.identifier.urihttp://hdl.handle.net/2263/61470
dc.language.isoenen_ZA
dc.publisherSouth African Society for Animal Scienceen_ZA
dc.rightsCopyright resides with the authors in terms of the Creative Commons Attribution 2.5 South African Licence.en_ZA
dc.subjectSkeletal muscleen_ZA
dc.subjectVascular distribution networken_ZA
dc.subjectVisceraen_ZA
dc.subjectMaximum metabolic rate (MMR)en_ZA
dc.subjectBasal metabolic rate (BMR)en_ZA
dc.titleBasal metabolic rate scaled to body mass between species by the fractal dimension of the vascular system and body compositionen_ZA
dc.typeArticleen_ZA

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