Visual Feedback Manipulation in Virtual Reality Alters Extension-evoked Pain Perception in Chronic LBP

This study explores the potential to influence movement-evoked pain in individuals with chronic low back pain (LBP) by altering visual proprioceptive feedback using virtual reality (VR). The researchers aim to understand whether manipulating visual feedback can change pain perception and movement behavior. A total of 50 patients with non-specific chronic LBP are expected to participate. Participants will perform lumbar spine extension movements until the point of pain onset under three experimental conditions: (1) without virtual reality (control); (2) underestimated movement feedback (E-), where the VR shows 10% less movement than performed; and (3) overestimated movement feedback (E+), where the VR depicts 10% more movement than performed. These manipulations aim to investigate how changes in perceived movement affect pain perception and range of motion. The lumbar range of motion (ROM) is objectively measured using a 3-space Fastrack motion analysis system to ensure precise tracking of physical movements. Additionally, the study examines whether psychological factors, such as pain intensity, kinesiophobia (fear of movement), disability, and catastrophising (exaggerated negative mental set about pain), influence susceptibility to VR feedback manipulation. To provide a comprehensive assessment, participants' pain thresholds, pain intensity levels, kinesiophobia, disability, and catastrophising tendencies are measured through validated tools. By combining physical and psychological evaluations, the study aims to identify potential subgroups of patients who might benefit most from VR-based interventions and shed light on the mechanisms through which visual feedback alters pain perception and movement behavior in chronic LB