The primary endpoint will be analyzed using ANOVA for repeated measures to compare level of fatigue of two groups at baseline, discharge, six weeks and 12 weeks. For the secondary endpoint, a subgroup analysis will be performed and reported on participants with and without iron- deficiency anemia to determine if any efficacy of iron on POF is restricted to this population or to a more general population post CABG surgery. Results will be reported using mean and standard deviation when appropriate and median (interquartile range) for nonparametric data. Categorical variables will be compared using Fisher exact test or t test when appropriate. Level of significance was set at p < 0.05.