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Figure 1 Data from a patient with PPH with illustration of the components of the single-exponential curves used to describe the exercise and recovery responses. In each case, the exponential function starts after a time delay. Exercise:  O2 = c + A(1 – e-(t – td)/ ), where c is preexercise baseline O2; A is amplitude from baseline to asymptotic value; td is time delay; and is time constant. Recovery: O2 = c + Ae-(t – td)/, where c is end-recovery asymptotic O2; A is amplitude of response; td is time delay; and is time constant.
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