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. 2014 May 26;5:192. doi: 10.3389/fphys.2014.00192

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Copyright © 2014 Roy and Secomb.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Time-dependent diameter changes in feed arteries (FA) and third order arterioles (3A) in response to sympathetic nerve activity (shaded bars) at rest and with increased oxygen demand representing three levels of muscle contraction (unshaded bars). In all cases, results for intermediate levels of SNA (C_symp = 2) are shown. Assumed levels of oxygen demand were 1 at rest, and 1.91, 4.64, and 8.28 (all in units of cm³O₂ cm⁻³ min⁻¹) for the three levels of contraction (DC2.5, DC10, and DC20%).