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. 2014 Jun 6;9(6):e98889. doi: 10.1371/journal.pone.0098889

Figure 2. Difference of OUEP and OUE between a typical IPAH patient and a control subject.

Figure 2

The kinetics of changes in oxygen uptake efficiency (OUE) for the same tests and subjects as depicted in Figure 1. OUE typically increase during exercise from rest to plateau in normal subjects and then decrease gradually until exercise end. It then decreases further in the immediate recovery period and begin stabilizing after about 2 minutes. In IPAH patients, OUE changes in a similar way as the controls, but is always lower than the controls in the transition from rest to exercise end.