Time constants of phosphocreatine and inorganic phosphate.

PCr and Pi time constants (τ) and steady state levels (Δss) for FRDA patients before (FRDA baseline) and after (FRDA rhuEPO) erythropoietin stimulation are shown as comparison to the corresponding control group. Values are given as mean and standard deviation (SD) sub-classified for incremental exercise and recovery period. For graphical illustration compare also figure 3. Abbreviations: PCr (phosphocreatine), Pi (inorganic phosphate), FRDA (Friedreich ataxia), rhuEPO (recombinant human erythropoietin).