Abstract
Arterial saturation (SaO2) decreases during intense aerobic exercise in many endurance athletes. However, is this decrease in SaO2 the same during maximal uphill treadmill running and maximal cycle ergometry? To investigate this, 13 healthy, active men performed two incremental progressive maximal cycle exercise tests; uphill treadmill running and cycle ergometry. Differences between tests were identified using ANOVA. Relationships between variables were analyzed using the Pearson Product Moment. Significance was set at p ≤ 0.05. Table No relationships were identified between SaO2 and ˙VE, PAO2, ˙VE/˙VO2, or˙VE/˙VCO2 within either exercise mode. Further, neither higher ˙VE nor PAO2 in the cycle as compared to the treadmill explain the higher SaO2 observed during cycling. In conclusion, the variability seen in SaO2 during maximal treadmill running and cycle ergometry cannot be explained by any of the ventilatory parameters measured.
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