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Respiratory muscle oxygenation kinetics: relationships with breathing pattern during exercise
R Legrand1, F Prieur, A Marles
1Laboratoires d'Etudes de la Motricité Humaine EA 3608, Faculté des Sciences du Sport et de l'Education Physique, Université de Lille 2, Ronchin, France.
International Journal of Sports Medicine
|July 14, 2006
Summary
Accessory respiratory muscle oxygenation (RMO2) decreases during exercise, linked to breathing pattern changes like increased breathing frequency. This breakdown in RMO2 occurs at similar exercise intensities as ventilatory thresholds.
Area of Science:
- Exercise Physiology
- Respiratory Physiology
- Sports Science
Background:
- Accessory respiratory muscles play a role in breathing during exertion.
- Understanding oxygenation kinetics in these muscles is crucial for exercise performance.
- Near-infrared spectroscopy (NIRS) allows non-invasive monitoring of muscle oxygenation.
Purpose of the Study:
- To investigate accessory respiratory muscle oxygenation (RMO2) during incremental exercise using NIRS.
- To examine the relationship between RMO2 kinetics and breathing pattern parameters.
- To identify the exercise intensity at which RMO2 breakdown occurs.
Main Methods:
- Nineteen young males underwent a maximal incremental cycle ergometer test.
- Muscle oxygenation of the serratus anterior was monitored using NIRS.
- Breathing pattern parameters (frequency, tidal volume) and ventilatory thresholds (VT1, VT2) were analyzed.
Main Results:
- All subjects exhibited decreased RMO2 (deoxygenation) during exercise.
- A breakdown in RMO2 (B-RMO2) was observed at submaximal workloads (around 86% VO2max).
- The intensity of B-RMO2 correlated significantly with breathing pattern changes (fRacc, VTplateau, VE/VT inflection) and VT2.
Conclusions:
- RMO2 breakdown appears linked to altered breathing patterns, particularly increased breathing frequency at VT2.
- Higher maximal oxygen consumption (VO2max) was associated with greater RMO2 decrease during exercise.
- These findings highlight the interplay between respiratory muscle oxygenation and ventilatory control during exercise.