Figure 1. Maximal oxygen uptake assessed by an incremental exercise test to exhaustion and a sub-maximal perceptually regulated exercise test (PRET) before and 12 weeks after stereotactic ablative body radiation therapy. A difference of 2.3 ml/kg/min was considered the minimal detectable change based on previous test-retest data. Typical errors for the patient were 1.0 ml/kg/min (incremental exercise test) and 5.5 ml/kg/min (PRET). * Decreased from baseline by more than the minimum detectable change.