The data analysis has revealed that MNN ( P < 0.001 ) , SDNN ( P < 0.05 ) , PNN50 % ( P < 0.01 ) , RMSSD ( P < 0.001 ) , HFnu ( P < 0.05 ) and LF/HF ratio ( P < 0.05 ) values were significantly increased relative to baseline at various time points in all the groups except in placebo group .