Patients with CKD stages @b to @ were randomly assigned to the exercise ( n = @ ; @ men ; median age , @ -LSB- IQR , @-@ -RSB- years ; median estimated glomerular filtration rate , @ -LSB- IQR , @-@ @ -RSB- mL/min/@ @ m ( @ ) ) or nonexercise control ( n = @ ; @ men ; median age , @ -LSB- IQR , @-@ -RSB- years ; estimated glomerular filtration rate , @ -LSB- IQR , @-@ @ -RSB- mL/min/@ @ m ( @ ) ) group .