REE showed group differences in posttraining conditions ( the 4-week group vs. the control group , 1220169 vs. 1067144 kcal/die , and the 8-week group vs. the control group , 1202151 vs. 1067144 kcal/die , P = 0.047 ) , but RHR decreased ( pre-program vs. post program : 9722 vs. 808 beat/min , P = 0.001 ) and VO ( 2peak ) significantly increased ( pre-program vs. post program : 27.87.8 vs. 34.86.5 mL/kg/min , P = 0.001 ) in the 8-week group compared to the control group .