Houssem Zorgati1,2, Katia Collomp3,4,5, Jan Boone6, Alexandre Guimard7,8, Olivier Buttelli9,10, Patrick Mucci11, Virgile Amiot12, Fabrice Prieur13,14. 1. Laboratoire CIAMS, Equipe MHAPS, Univ Paris Sud-Univ Orléans, 45067, Orléans, France. zorgati.houssem@gmx.fr. 2. UFR Collegium Sciences et Techniques, Pôle disciplinaire STAPS, 2 Allée du Château, BP 6237, 45062, Orléans Cedex 2, France. zorgati.houssem@gmx.fr. 3. Laboratoire CIAMS, Equipe MHAPS, Univ Paris Sud-Univ Orléans, 45067, Orléans, France. katia.collomp@univ-orleans.fr. 4. UFR Collegium Sciences et Techniques, Pôle disciplinaire STAPS, 2 Allée du Château, BP 6237, 45062, Orléans Cedex 2, France. katia.collomp@univ-orleans.fr. 5. Département des Analyses, AFLD, Chatenay-Malabry, France. katia.collomp@univ-orleans.fr. 6. Department of Movement and Sport Sciences, Ghent University, 2 Watersportlaan, 9000, Ghent, Belgium. jan.boone@ugent.be. 7. Laboratoire CIAMS, Equipe MHAPS, Univ Paris Sud-Univ Orléans, 45067, Orléans, France. alexandre.guimard@univ-orleans.fr. 8. UFR Collegium Sciences et Techniques, Pôle disciplinaire STAPS, 2 Allée du Château, BP 6237, 45062, Orléans Cedex 2, France. alexandre.guimard@univ-orleans.fr. 9. PRISME, Univ Orléans, 12 rue de Blois, BP 6744, 45067, Orléans, France. olivier.buttelli@univ-orleans.fr. 10. UFR Collegium Sciences et Techniques, Pôle disciplinaire STAPS, 2 Allée du Château, BP 6237, 45062, Orléans Cedex 2, France. olivier.buttelli@univ-orleans.fr. 11. Faculté des Sciences du Sport et de l'Education Physique, UDSL, EA4488 Activité Physique - Muscle - Santé, 9 rue de l'université, 59790, Ronchin, France. patrick.mucci@univ-lille2.fr. 12. Service de Médecine du Sport et d'Exploration Fonctionnelle Respiratoire, CHR Orléans La Source, 45032, Orléans Cedex 1, France. virgile.amiot@chr-orleans.fr. 13. Laboratoire CIAMS, Equipe MHAPS, Univ Paris Sud-Univ Orléans, 45067, Orléans, France. fabrice.prieur@univ-orleans.fr. 14. UFR Collegium Sciences et Techniques, Pôle disciplinaire STAPS, 2 Allée du Château, BP 6237, 45062, Orléans Cedex 2, France. fabrice.prieur@univ-orleans.fr.
Abstract
PURPOSE: The aim of this study was to compare the muscle oxygenation between trained and untrained subjects during heavy exercise until exhaustion at two extreme pedaling cadences using a NIRS system. METHODS: Nine untrained male subjects and nine male competitive triathletes cycled until exhaustion at an intensity corresponding to 90 % of the power output achieved at peak oxygen uptake at 40 and 100 rpm. Gas exchanges were measured breath-by-breath during each exercise. Muscle (de)oxygenation was monitored continuously by near-infrared spectroscopy on the Vastus Lateralis. RESULTS: Muscle deoxygenation (∆deoxy[Hb + Mb], i.e., O2 extraction) and ∆total[Hb + Mb] were significantly higher at 40 rpm compared to 100 rpm during the exercise in untrained subjects but not in triathletes (p < 0.05). The time performed until exhaustion was significantly higher at 40 than at 100 rpm in untrained subjects (373 ± 55 vs. 234 ± 37 s, respectively) but not in triathletes (339 ± 69 vs. 325 ± 66 s). CONCLUSIONS: These results indicate that high aerobic fitness (1) allows for better regulation between [Formula: see text]O2M and VO2M following the change in pedaling cadence, and (2) is the most important factor in the relationship between pedaling cadence and performance.
PURPOSE: The aim of this study was to compare the muscle oxygenation between trained and untrained subjects during heavy exercise until exhaustion at two extreme pedaling cadences using a NIRS system. METHODS: Nine untrained male subjects and nine male competitive triathletes cycled until exhaustion at an intensity corresponding to 90 % of the power output achieved at peak oxygen uptake at 40 and 100 rpm. Gas exchanges were measured breath-by-breath during each exercise. Muscle (de)oxygenation was monitored continuously by near-infrared spectroscopy on the Vastus Lateralis. RESULTS: Muscle deoxygenation (∆deoxy[Hb + Mb], i.e., O2 extraction) and ∆total[Hb + Mb] were significantly higher at 40 rpm compared to 100 rpm during the exercise in untrained subjects but not in triathletes (p < 0.05). The time performed until exhaustion was significantly higher at 40 than at 100 rpm in untrained subjects (373 ± 55 vs. 234 ± 37 s, respectively) but not in triathletes (339 ± 69 vs. 325 ± 66 s). CONCLUSIONS: These results indicate that high aerobic fitness (1) allows for better regulation between [Formula: see text]O2M and VO2M following the change in pedaling cadence, and (2) is the most important factor in the relationship between pedaling cadence and performance.