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Control of maximum metabolic rate in humans: Dependence on performance phenotypes

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Abstract

Borrowing from metabolic control analysis the concept of control coefficients or c i values, defined as fractional change in MMR/fractional change in the capacity of any given step in ATP turnover, we used four performance phenotypes to compare mechanisms of control of aerobic maximum metabolic rate (MMR): (i)) untrained sedentary (US) subjects, as a reference group against which to compare (ii) power trained (PT), (iii) endurance trained (ET), and (iv) high altitude adapted native (HA) subject groups. Sprinters represented the PT group; long distance runners illustrated the ET group; and Andean natives represented the HA group. Numerous recent studies have identified contributors to control on both the adenosine triphosphate (ATP) supply side and the ATP demand side of ATP turnover. From the best available evidence it appears that at MMR all five of the major steps in energy delivery (namely, ventilation, pulmonary diffusion, cardiac output, tissue capillary – mitochondrial O2 transfer, and aerobic cell metabolism per se) approach an upper functional ceiling, with control strength being distributed amongst the various O2 flux steps. On the energy demand side, the situation is somewhat simplified since at MMR ∽ 90% of O2-based ATP synthesis is used for actomyosin (AM) and Ca2+ ATPases; at MMR these two ATP demand rates also appear to be near an upper functional ceiling. In consequence, at MMR the control contributions or c i values are distributed amongst all seven major steps in ATP supply and ATP demand pathways right to the point of fatigue. Relative to US (the reference group), in PT subjects at MMR control strength shifts towards O2 delivery steps (ventilation, pulmonary diffusion, and cardiac output); here physiological regulation clearly dominates MMR control. In contrast in ET and HA subjects at MMR control shifts towards the energy demand steps (AM and Ca2+ ATPases), and more control strength is focussed on tissue level ATP supply and ATP demand. One obvious advantage of the ET and HA biochemical-level control is improved metabolite homeostasis. Additionally, with some reserve capacity in the O2 delivery steps, the focussing of control on ATP turnover at the tissue level has allowed nature to improve on an ‘endurance machine’ design.

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Authors and Affiliations

  1. Departments of Zoology and Radiology, and Sports Medicine Division, University of British Columbia, Vancouver, B.C., Canada, V6T 1Z5

    Peter W. Hochachka

  2. Department of Kinesiology, University of Montreal, Montreal, Quebec, Canada

    Yan Burelle

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  1. Peter W. Hochachka
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Hochachka, P.W., Burelle, Y. Control of maximum metabolic rate in humans: Dependence on performance phenotypes. Mol Cell Biochem 256, 95–103 (2004). https://doi.org/10.1023/B:MCBI.0000009861.45692.ed

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