Among men only , significant differences were found in VO2 ( rehabilitation : 20.9 mL/min/kg [ standard deviation ( SD ) 8.1 ] vs 23.4 mL/min/kg [ SD 9.5 ] and usual care : 22.1 mL/min/kg [ SD 8.1 ] vs 21.8 mL/min/kg [ SD 8.3 ] , P = 0.01 ) , total exercise time ( rehabilitation : 587.0 seconds [ SD 249.6 ] vs 650.7 seconds [ SD 279.8 ] and usual care : 613.8 seconds [ SD 264.7 ] vs 606.1 seconds [ SD 277.3 ] , P = 0.01 ) , and the mental component scale ( rehabilitation : 47.7 points [ SD 10.1 ] vs 54.8 points [ 7.1 ] and usual care : 48.1 points [ SD 10.9 ] vs 51.9 points [ SD 9.6 ] , P = 0.05 ) .