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LATE-BREAKING ABSTRACT: Deoxyhemoglobin kinetic and performance of respiratory muscles during maximal incremental exercise

Introduction: The VO2 excess (VO2e) observed after the ventilatory anaerobic threshold (VAT) has been considered as a consequence to an increase in respiratory muscles work during maximal incremental exercise (MIE). Aims: to assess respiratory muscles performance (RMP) and their deoxyhemoglobin (HHb) kinetic performed by NIRS during MIE and thereafter to study the relationships between the VO2e, the HHb and the RMP. Methods: Ten male cyclists performed a MIE on a cycle ergometer with maximal inspiratory (MIP) and expiratory (MEP) pressures measurement assessed both before and after MIE. The HHb kinetic was monitored by NIRS in the seventh intercostal space. The VO2e represent the difference between VO2max measured by portable gas analyzer (Cosmed K4b2) and VO2max calculated using linear equation before VAT (VO2= a x Power + b; at VO2max, Power = Maximal Aerobic Power (MAP)). Results: MIP and MEP decrease respectively by 7.8% and 12.6% (p Conclusions: The increase in work of respiratory muscles contributes to VO2e and might limit their performance during MIE. This result highlighted the importance of respiratory muscles training incorporation in rehabilitation protocols to improve independency and quality of life in cardiorespiratory patients.