Journal article
Excess VO 2 during ramp exercise is positively correlated to intercostal muscles deoxyhemoglobin levels above the gas exchange threshold in young trained cyclists
Respiratory Physiology & Neurobiology, Vol.228, pp.83-90
2016
Abstract
We assessed respiratory muscles oxygenation responses during a ramp exercise to exhaustion and further explored their relationship with the non-linear increase of VO2 (VO2 excess) observed above the gas-exchange threshold. Ten male cyclists completed a ramp exercise to exhaustion on an electromagnetically braked cycle-ergometer with a rate of increment of 30 W min−1 with continuous monitoring of expired gases (breath-by-breath) and oxygenation status of intercostal muscles. Maximal inspiratory and expiratory pressure measurements were taken at rest and at exhaustion. The VO2 excess represents the difference between VO2max observed and VO2max expected using linear equation between the VO2 and the intensity before gas-exchange threshold. The deoxyhemoglobin remained unchanged until 60% of maximal aerobic power (MAP) and thereafter increased significantly by 37 ± 18% and 40 ± 22% at 80% and 100% of MAP, respectively. Additionally, the amplitude of deoxyhemoglobin increase between 60 and 100% of MAP positively correlated with the VO2 excess (r = 0.69, p < 0.05). Compared to exercise start, the oxygen tissue saturation index decreased from 80% of MAP (−4.8 ± 3.2%, p < 0.05) onwards. At exhaustion, maximal inspiratory and expiratory pressures declined by 7.8 ± 16% and 12.6 ± 10% (both p < 0.05), respectively. In summary, our results suggest a significant contribution of respiratory muscles to the VO2 excess phenomenon.
Details
- Title
- Excess VO 2 during ramp exercise is positively correlated to intercostal muscles deoxyhemoglobin levels above the gas exchange threshold in young trained cyclists
- Authors/Creators
- F. Oueslati (Author/Creator) - Université de Picardie Jules VerneO. Girard (Author/Creator) - University of LausanneZ. Tabka (Author/Creator) - University of SousseS. Ahmaidi (Author/Creator) - Université de Picardie Jules Verne
- Publication Details
- Respiratory Physiology & Neurobiology, Vol.228, pp.83-90
- Publisher
- Elsevier
- Identifiers
- 991005544292107891
- Copyright
- © 2016 Elsevier B.V.
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 1 Clinical & Life Sciences
- 1.172 Sports Science
- 1.172.648 Exercise Physiology
- Web Of Science research areas
- Physiology
- Respiratory System
- ESI research areas
- Clinical Medicine