Finally, muscle activation will be evaluated by surface electromyography and the maximum voluntary contraction of the trunk at 30 degrees position for a lumbar dynamometer that will be adjusted to the anthropometric profile of patients. The average and maximum values of muscular strength will be obtained by maximum voluntary contraction. The electromyography will capture the muscle activity in an integrated manner to electrogoniometers and will transmit the data via Bluetooth to a desktop with a MWX8 software (Biometrics) that will analyze the data. Before instrumentation patients will be instructed to perform the trunk extension movement the therapist's commands to become familiar with the equipment. Soon after will be held instrumentation (placement of electromyography electrodes and electrogoniometers and lumbar dynamometer) maximal voluntary contraction will be collected in trunk extension without Kinesio taping