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Cited by 62

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Disparity in regional and systemic circulatory capacities: do they affect the regulation of the circulation?

Calbet, J. A. L., Joyner, M. J.·2010·Acta Physiologica
DOI 10.1111/j.1748-1716.2010.02125.x
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Abstract

In this review we integrate ideas about regional and systemic circulatory capacities and the balance between skeletal muscle blood flow and cardiac output during heavy exercise in humans. In the first part of the review we discuss issues related to the pumping capacity of the heart and the vasodilator capacity of skeletal muscle. The issue is that skeletal muscle has a vast capacity to vasodilate during exercise [∼300 mL (100 g)−1 min−1], but the pumping capacity of the human heart is limited to 20–25 L min−1 in untrained subjects and ∼35 L min−1 in elite endurance athletes. This means that when more than 7–10 kg of muscle is active during heavy exercise, perfusion of the contracting muscles must be limited or mean arterial pressure will fall. In the second part of the review we emphasize that there is an interplay between sympathetic vasoconstriction and metabolic vasodilation that limits blood flow to contracting muscles to maintain mean arterial pressure. Vasoconstriction in larger vessels continues while constriction in smaller vessels is blunted permitting total muscle blood flow to be limited but distributed more optimally. This interplay between sympathetic constriction and metabolic dilation during heavy whole‐body exercise is likely responsible for the very high levels of oxygen extraction seen in contracting skeletal muscle. It also explains why infusing vasodilators in the contracting muscles does not increase oxygen uptake in the muscle. Finally, when ∼80% of cardiac output is directed towards contracting skeletal muscle modest vasoconstriction in the active muscles can evoke marked changes in arterial pressure.

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Cited by

Metadata

Authors
Calbet, J. A. L., & Joyner, M. J.
Venue
Acta Physiologica
Publisher
Wiley
Published
2010-07
Volume
199
Issue
4
Pages
393-406
ISSN
  • 1748-1708
  • 1748-1716
DOI
10.1111/j.1748-1716.2010.02125.x
Cited by
62
References
7
Language
en
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor)

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