Patients with nonspecific chronic low back pain and pain equal to or greater than @ in the Pain Numerical Rating Scale ( @/@ ) will be randomly assigned to one of two groups : Group with active interferential current + Pilates ( n = @ ) will be submitted to the active interferential current associated to the modified Pilates exercises , and Group with sham interferential current + Pilates ( n = @ ) will be submitted to the sham interferential current associated with the modified Pilates exercises during @ sessions .