This study is a randomized controlled trial evaluating clinical effects of a protocol of Physical Therapy Treatment (PTT), via manual therapy and active mobilization, adding or not a magnetic field therapy in people with non-specific low back pain lasting at least 6 weeks. Participants were randomized to receive either a PTT protocol including a magnetic stimulation treatment or the same PTT protocol with a sham magnetic intervention. The interventions are conducted in 3 sessions provided during 3 weeks.~Intervention:~A description of the 2 groups of treatment:~- Experimental group 1: a protocol of physical therapy treatment including:~Manual therapy techniques for inhibition of piriformis, quadratus lumbar, and paravertebral muscles in prone position and bilaterally.~2 functional techniques applied to the sacrum in prone position.~A myofascial release of ligaments inserted to the sacrum in prone position and bilaterally.~Manual therapy technique for inhibition of psoas-iliacus muscle in supine position and bilaterally.~Stretching techniques of piriformis, gluteal and paravertebral muscles in supine position and bilaterally.~Active gluteus maximus contraction in supine position bilaterally.~To this protocol, a 15 minutes of magnetic field therapy treatment applied to the lumbosacral region in prone position is added.~- Experimental group 2: the same Physical Therapy Treatment protocol with a sham magnetic intervention applying in the same region with a disconnected device during 15 minutes.
A randomized and controlled trial to people with low back pain who are divided into 2 groups of treatment: 1- people treated with a protocol of physical therapy techniques without magnetic field therapy; 2- people treated with the same protocol of physical therapy techniques adding a magnetic stimulation treatment. The interventions are conducted in 3 sessions provided during 3 weeks.The lumbar pain and disability are assessed before and after the intervention, and lumbar flexion and extension pain are assessed before and after each session in all the participants.