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Changing rate of the ≤55-year group and >55-year group about CPET. * p < 0.05, comparing the increment between the ≤55-year group and >55-year group. Δ refers to the changing rate of variables. CPET cardiopulmonary exercise, HR heart rates, VO2 oxygen uptake, RER respiratory exchange ratio, VE ventilation, VE/VCO2 VE–VCO2 slope, OUES, oxygen uptake efficiency slope, CI Confidence interval.
