Effects of physical fitness (trained, sedentary or heart disease) on recovery kinetics of muscle oxygen saturation after cardiopulmonary exercise testing

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Orlando, F. | Milstein, E. | Krim, F. | Leprêtre, P.-M.

Edité par CCSD ; Elsevier ; Société française de cardiologie [2008-....] -

International audience. IntroductionDelayed oxygen uptake recovery kinetics after cardiopulmonary exercise testing (CPET) was associated with slow recovery of energy stores due to oxygen delivery limitation in the peripheral skeletal muscles of patients with cardiac disease (Cohen-Solal et al. Circulation. 1995, Kemps et al. Int J Cardiol. 2010). Oxygen delivery and utilization are reflected as muscle oxygen saturation (SmO2) (Salvatore et al. J Funct Morphol Kinesiol. 2022).ObjectiveThe study aimed to compare the recovery kinetics of SmO2 among subjects with different fitness levels.Method15 patients with cardiac disease (GMC), 15 sedentary (GSS) and 11 trained triathletes (GTE) performed a CPET on cycle ergometer with gas exchanges (Vyntus, Carefusion, San Diego, EU). SmO2 values (MoxyMonitor, Hutchinson, EU) were recorded during exercise and active post-exercise recovery. Response to exercise (A-on), amplitude (A-off) and time constant (tau) of active recovery were calculated by fitting SmO2 data to a mono-exponential function (Mankowski et al. J Exerc Sci Fit. 2017).ResultsThe pic value of oxygen uptake (VO2peak) was significant higher in GTE (49.9 ± 7.1 mLO2.min-1.kg-1) compared to GSS (34.5 ± 6.0 mLO2.min-1.kg-1, p < 0.01) or GMC (19.6 ± 6.6 mLO2.min-1.kg-1, p < 0.01) and GSS compared to GSS (p < 0.01). A-on values were significantly higher in GTE (38.8 ± 12.0%) compared to GMC (18.91 ± 2.2%, P = 0.003) but not compared to GSS (29.1 ± 16.9%, P = 0.207). No significant SmO2 A-on difference was also found between GMC and GSS (P = 0.129). A-off and tau were not significant different between all groups (P = NS) (Figure 1). However, A-off values were related to VO2peak (r = 0.51, p < 0.01) and A-on (r = 0.64, p < 0.01). No relation was found between tau values, A-on, A-off or VO2peak.ConclusionThe SmO2 time constant measured during active post-exercise recovery is not a good parameter to discriminate the fitness status of our subjects.

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