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Heart rate (HR) versus VO2 from the cardiopulmonary exercise testing (CPET) used to determine VO2peak of one bone marrow transplant patient who completed the same testing procedure used in the present study. The VO2 values represent raw VO2 data recorded every 4 s during the CPET and averaged over 30-s intervals. The HR data were recorded every 10 s during the CPET.
