Low back pain is a global problem that currently affects many people's participation in daily activities, and its prevalence has been increasing over the years. Exercise is among the most effective treatment approaches for reducing and preventing pain and disability related to low back pain. To enhance the effects of exercise, various adjunctive methods may be needed. Local vibration applications delivered through mechanical devices are offer practical and time-efficient application, which may reduce the physiotherapist's manual workload, while also providing potential benefits for patients with musculoskeletal pain. Therefore, the aim of this study is to investigate the effects of Percussive Massage Therapy (PMT) applied using a heat-therapy attachment on pain, disability, spinal mobility, health-related quality of life, kinesiophobia, and patient satisfaction in individuals with chronic low back pain.

Patients with chronic low back pain who meet the inclusion criteria will be randomly assigned to either the PMT group or the Control group (CG). All participants will receive a conventional rehabilitation program consisting of supervised exercise training and transcutaneous electrical nerve stimulation (TENS) for 2 weeks, 5 days per week, for approximately 45 to 60 minutes per day. The CG will receive only this conventional rehabilitation program. In addition, participants in the PMT group will receive PMT immediately after each conventional rehabilitation session, consisting of an 8-minute application (4 minutes per side) over the paravertebral muscles using a percussive massage therapy device.

Outcome measures will be assessed at baseline and post-treatment (end of week 2). Pain intensity will be evaluated using the Visual Analog Scale (VAS); disability using the Oswestry Disability Index (ODI); spinal flexibility using the finger-to-floor distance test; health-related quality of life using the Short Form-36v2 (SF-36v2); and kinesiophobia using the Tampa Scale for Kinesiophobia (TSK). Treatment satisfaction will be assessed post-treatment using the Global Perceived Effect Scale (GPE), and all data will be recorded on a data collection form.

In 2020, low back pain affected an estimated 619 million people worldwide, and this number is projected to reach 843 million by 2050, with a disproportionate burden among socioeconomically disadvantaged populations. To avoid harmful and ineffective treatments, evidence supporting the safety, effectiveness, and cost-efficiency of interventions should be integrated into routine care, and greater investment in clinical research is needed to reduce the gap between research and clinical practice.

Clinical practice guidelines indicate that exercise is a primary non-invasive approach for reducing pain and disability in chronic low back pain. Adjunct non-pharmacological methods such as electrotherapy and massage are often used to enhance treatment effects. Although the evidence for vibration therapy is still emerging and has focused mainly on whole-body vibration, local vibration remains a promising but under-studied option for individuals with low back pain.

Local vibration can be delivered using different modalities, one of which is percussive massage therapy (PMT). PMT is applied via a mechanical device that delivers low-frequency pressure pulses to the skin, transmitting vibration to the underlying myofascial tissues. It is widely used as a low-cost and accessible adjunct for pain management, injury prevention, and rehabilitation. Previous studies have reported that vibration-based massage interventions are safe and well tolerated, and PMT has shown beneficial effects in neck pain and in selected low back pain populations, although evidence remains limited.

Soft tissue massage may alleviate pain by increasing local blood flow and oxygenation and by modulating neurophysiological pathways, including stimulation of large-diameter afferent fibers that can reduce pain perception via gate control mechanisms. Similarly, localized vibration can increase tissue perfusion, oxygen saturation, and temperature. PMT, which delivers low-frequency, localized mechanical pulses to myofascial tissues, may further influence pain through activation of mechanoreceptors and central pain-modulating pathways. These effects provide a rationale for investigating the impact of PMT delivered with a heat-therapy attachment on pain and disability in individuals with chronic low back pain.

Studies investigating mechanisms related to the effects of PMT applied to the low back have examined its potential effects on posture-related parameters, trigger points, and thoracolumbar fascia (TLF) characteristics, including echo intensity and thickness. Proposed mechanisms include reductions in myofascial stiffness through mechanical loading and heat-related changes that may influence tissue viscoelasticity, as well as neurophysiological effects that could reduce fascial tension and improve tissue extensibility. Acute PMT has been reported to increase tissue temperature and reduce TLF echo intensity and perceived stiffness, while TLF thickness appears largely unchanged across short- to longer-term observations in both healthy individuals and pationts with low back pain.

Inclusion Criteria:

• Age 25 to 55 years.
• Diagnosis of chronic low back pain confirmed by a physician (pain localized to the lumbar region, above the inferior gluteal folds and below the costal margin) with a duration of ≥ 3 months.
• Baseline pain intensity of 30-80 mm on the Visual Analog Scale (3 cm ≤ VAS ≤ 8 cm).

Exclusion Criteria:

• History of, or planned, surgery involving the low back or abdominal region.
• Malignancy, vertebral fracture, or other serious spinal pathology.
• Spinal injection or intervention within the past 3 months (e.g., epidural injection, facet joint steroid injection, neuroplasty).
• Long-term use of analgesic or corticosteroid medications that may affect musculoskeletal symptoms.
• Diagnosis of radiculopathy or neuropathy (with or without spinal canal stenosis).
• Cognitive impairment that would preclude providing informed consent.
• Significant structural spinal deformity (e.g., spondylolisthesis, congenital spinal deformities).
• Progressive neurological disorder affecting the lower limbs/spine or inflammatory spinal disease (e.g., axial spondyloarthritis), or cardiovascular instability.
• Pregnancy.
• Medical conditions contraindicating exercise participation

This trial is assessor-blinded. The intervention will be delivered by study personnel who are not involved in outcome assessments. Outcome assessors will be unaware of group allocation. Participants will be instructed not to disclose their assigned group or any treatment details to the outcome assessor.