Exercise training reduced the frequency of acute exacerbations ( median @ -LSB- IQR @-@ -RSB- ) compared to the control group ( @ -LSB- @-@ -RSB- ) over @months follow up ( p = @ ) , with a longer time to first exacerbation with exercise training of @months ( @ % CI @ to @months ) compared to the control group ( @months -LSB- @ % CI @ to @months -RSB- , p = @ ) .