Journal article
Influence of exercise duration on cardiorespiratory responses, energy cost and tissue oxygenation within a 6 hour treadmill run
PeerJ, Vol.5, pp.1-18
2017
Appears in UniSC Supported Open Access Outputs
Abstract
Purpose: The physiological mechanisms for alterations in oxygen utilization (V̇ O2V̇O2) and the energy cost of running (Cr) during prolonged running are not completely understood, and could be linked with alterations in muscle and cerebral tissue oxygenation. Methods: Eight trained ultramarathon runners (three women; mean±SD; age 37±7 yr; maximum V̇ O2V̇O2 60±15 mL min-1 kg-1) completed a 6 hr treadmill run (6TR), which consisted of four modules, including periods of moderate (3 min at 10 km h-1, 10-CR) and heavy exercise intensities (6 min at 70% of maximum V̇ O2V̇O2, HILL), separated by three, 100 min periods of self-paced running (SP). We measured V̇ O2V̇O2, minute ventilation (V̇ EV̇E), ventilatory efficiency (V̇ E:V̇ O2V̇E:V̇O2), respiratory exchange ratio (RER), Cr, muscle and cerebral tissue saturation index (TSI) during the modules, and heart rate (HR) and perceived exertion (RPE) during the modules and SP. Results: Participants ran 58.3±10.5 km during 6TR. Speed decreased and HR and RPE increased during SP. Across the modules, HR and V̇ O2V̇O2 increased (10-CR), and RER decreased (10-CR and HILL). There were no significant changes in V̇ EV̇E, V̇ E:V̇ O2V̇E:V̇O2, Cr, TSI and RPE across the modules. Conclusions: In the context of positive pacing (decreasing speed), increased cardiac drift and perceived exertion over the 6TR, we observed increased RER and increased HR at moderate and heavy exercise intensity, increased V̇ O2V̇O2 at moderate intensity, and no effect of exercise duration on ventilatory efficiency, energy cost of running and tissue oxygenation.
Details
- Title
- Influence of exercise duration on cardiorespiratory responses, energy cost and tissue oxygenation within a 6 hour treadmill run
- Authors
- Hugo Kerherve (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringScott McLean (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringKaren Birkenhead (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringDavid Parr (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringColin Solomon (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
- Publication details
- PeerJ, Vol.5, pp.1-18
- Publisher
- PeerJ, Ltd.
- Date published
- 2017
- DOI
- 10.7717/peerj.3694
- ISSN
- 2167-8359
- Copyright note
- Copyright © 2017 Kerhervé et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.
- Organisation Unit
- Centre for Human Factors and Systems Science; School of Health and Sport Sciences - Legacy; School of Health - Sports & Exercise Science; School of Health and Behavioural Sciences - Legacy
- Language
- English
- Record Identifier
- 99451303202621
- Output Type
- Journal article
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- Web Of Science research areas
- Sport Sciences