Statistical analysis
Data analysis was performed using SPSS version 20.0. The Shapiro-Wilk test was used in order to determine the standard of data normality. Quantitative variables were expressed as mean and standard deviation, intra-group comparison of preoperative values with values obtained at hospital discharge were performed using the paired Student t test, and the independent Student t test for inter-group analyzes. Spearman’s test was used to correlate the muscle strength variable with the cardiac anxiety outcome. P <0.05 was considered significant.