Inspiratory loading and limb locomotor and respiratory muscle deoxygenation during cycling exercise

Turner, Louise, Tecklenburg-Lund, Sandra, Chapman, Robert, Stager, Joel, Duke, Joseph and Mickleborough, Timothy (2013) Inspiratory loading and limb locomotor and respiratory muscle deoxygenation during cycling exercise. Respiratory Physiology and Neurobiology, 185 (3). pp. 506-514. ISSN 1569-9048

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Official URL: http://dx.doi.org/10.1016/j.resp.2012.11.018

Abstract

The aim of this study was to determine the effect of inspiratory loading on limb locomotor (LM) and respiratory muscle (RM) deoxygenation ([deoxy (Hb+Mb)]) using NIRS during constant-power cycling exercise. Sixteen, male cyclists completed three, 6-min trials. The intensity of the first 3-min of each trial was equivalent to ~80% V(O(2max)) (EX(80%)); during the final 3-min, subjects received an intervention consisting of either moderate inspiratory loading (Load(mod)), heavy inspiratory loading (Load(heavy)), or maximal exercise (Load(EX)). Load(heavy) significantly increased LM [deoxy(Hb+Mb)] from 12.2±9.0 μm during EX(80%) to 15.3±11.7 μm, and RM [deoxy(Hb+Mb)] from 5.9±3.6 μm to 9.5±6.6 μm. LM and RM [deoxy(Hb+Mb)] were significantly increased from EX(80%) to Load(EX); 12.8±9.1 μm to 16.4±10.3 μm and 5.9±2.9 μm to 11.0±6.4 μm, respectively. These data suggest an increase in respiratory muscle load increases muscle deoxy(Hb+Mb) and thus may indicate a reduction in oxygen delivery and/or increased oxygen extraction by the active muscles.

Item Type: Article
Uncontrolled Keywords: Near-infrared spectroscopy, resistive breathing, muscle oxygenation
Subjects: C600 Sports Science
Divisions: Faculties > Health and Life Sciences > School of Life Sciences > Sport and Exercise Sciences
Depositing User: Louise Turner
Date Deposited: 16 Apr 2013 13:01
Last Modified: 21 Nov 2013 15:22
URI: http://nrl.northumbria.ac.uk/id/eprint/12207

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