Comparison of the Effectiveness of Various Deep Heating Modalities in the Management of Chronic Low Back Pain

Continuous mode microwave diathermy (2,450 MHz) will be applied to the lumbar region using a standard physiotherapy unit. Each session will last 20 minutes, 5 sessions per week for 3 consecutive weeks, in addition to a standardized lumbar stabilization exercise program.

Continuous mode shortwave diathermy (27.12 MHz) will be delivered to the lumbar region using capacitive or inductive electrodes according to manufacturer guidelines. Each session will last 20 minutes, 5 sessions per week for 3 consecutive weeks, in addition to a standardized lumbar stabilization exercise program.

Continuous mode therapeutic ultrasound at 1 MHz frequency and 1.5 W/cm² intensity will be applied to the lumbar paraspinal muscles with slow circular movements using a coupling gel. Treatment will last 10 minutes per session, 5 sessions per week for 3 consecutive weeks, in addition to a standardized lumbar stabilization exercise program.

Participants will perform a home-based lumbar stabilization exercise program, including stretching, core strengthening, and posture correction exercises, supervised weekly by a physiotherapist. The program will be performed 3 sessions per week for 4 consecutive weeks.