Immediate Effects of a Yoga-Based Static Stretching Sequence on Thoracolumbar Fascia Shear Mobility and Lumbar Range of Motion

Background Thoracolumbar fascia (TLF) shear mobility is relevant to lumbar spine function and low back pain, yet evidence on immediate fascial responses to movement-based interventions remains limited. This study investigated whether a single 15-minute yoga-based static stretching sequence can acutely affect TLF shear mobility and lumbar flexion range of motion (ROM). Methods In a randomized parallel-group study, 31 healthy adults were assigned to either a standardized yoga intervention or a sham yoga control condition. Absolute thoracolumbar fascia shear mobility was measured using ultrasound imaging in both forward-flexed and upright positions before and after the intervention. Lumbar flexion ROM was assessed with the TRICURO GO device. Changes were analyzed within and between groups over time to assess the differential effects of the interventions. Results Small descriptive pre–post changes were observed in thoracolumbar fascia shear mobility and lumbar flexion ROM in both groups; however, the mixed ANOVA showed no statistically significant main effects of time or group and no significant time × group interactions for either outcome. Low back pain status did not significantly influence the results. Two incomplete datasets were excluded and replaced before final analysis because of insufficient ultrasound image quality or technical malfunction of the TRICURO GO device. Conclusion A single short yoga session did not produce significant immediate changes in TLF shear mobility or lumbar flexion ROM. Longer or repeated interventions may be required to detect measurable fascial or spinal adaptations.