Silveira LR, Pinheiro CHDJ, Zoppi CC, Hirabara SM, Vitzel KF, Bassit RA, Barbosa MR, Sampaio IH, Melo IHP, Fiamoncini J, Carneiro EM, Curi R. [Regulation of glucose and fatty acid metabolism in skeletal muscle during contraction].
ACTA ACUST UNITED AC 2011;
55:303-13. [PMID:
21881812 DOI:
10.1590/s0004-27302011000500002]
[Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2011] [Accepted: 05/12/2011] [Indexed: 03/10/2023]
Abstract
The glucose-fatty acid cycle explains the preference for fatty acid during moderate and long duration physical exercise. In contrast, there is a high glucose availability and oxidation rate in response to intense physical exercise. The reactive oxygen species (ROS) production during physical exercise suggests that the redox balance is important to regulate of lipids/carbohydrate metabolism. ROS reduces the activity of the Krebs cycle, and increases the activity of mitochondrial uncoupling proteins. The opposite effects happen during moderate physical activity. Thus, some issues is highlighted in the present review: Why does skeletal muscle prefer lipids in the basal and during moderate physical activity? Why does glucose-fatty acid fail to carry out their effects during intense physical exercise? How skeletal muscles regulate the lipids and carbohydrate metabolism during the contraction-relaxation cycle?
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