Effect of Passive Versus Active Aquatic Therapy Compared With Conventional Physiotherapy for Chronic Low Back Pain: A Randomized Crossover Trial

Active Aquatic Therapy involves structured, therapist-guided exercises in a heated hydrotherapy pool (32-34°C). Water buoyancy and resistance reduce spinal load, facilitate movement, and enhance muscle activation. Sessions last 45-60 minutes, 3 times per week for 4 weeks, supervised by licensed physiotherapists. Each session includes warm-up (water marching, arm swings, trunk rotations), main exercises (lumbar spine function, core strengthening, balance, hip abduction, back extensions, aqua walking, arm/leg strengthening), and cool-down (floating, deep breathing, passive stretches). Intensity is monitored using the Borg RPE scale (60-80% max HR). This intervention uniquely uses active engagement in water to reduce pain and improve strength, flexibility, and function, distinguishing it from passive aquatic therapy and land-based physiotherapy.

Passive Aquatic Therapy (Watsu) is a therapist-guided, passive aquatic technique performed in a warm hydrotherapy pool (35°C). The patient floats while the therapist gently moves their body in rhythmic, synchronized patterns, providing massage, stretching, joint mobilization, and acupressure. Sessions last 45-60 minutes, 3 times per week for 4 weeks, and include preparation/floating, cradling with passive movements, passive stretching and mobilization, acupressure, and final relaxation. Neck and knee supports are used for comfort. This intervention uniquely emphasizes passive relaxation and gentle mobilization, making it suitable for patients with severe movement limitations, distinguishing it from active aquatic therapy and conventional land-based physiotherapy.

Conventional Physiotherapy is a land-based intervention for chronic low back pain, delivered in an outpatient physiotherapy clinic. Sessions last 45 minutes, 3 times per week for 4 weeks, and include hot pack application (10-12 min) to reduce stiffness, electrotherapy (TENS/Interferential, 15 min) for pain modulation, and supervised therapeutic exercises (15-20 min) focusing on lumbar mobility, core stability, and spinal strengthening. Exercises include William's flexion, prone press-ups, cat-cow mobilization, hamstring stretches, pelvic tilts, and abdominal bracing. This intervention emphasizes pain reduction, postural control, and strengthening deep abdominal and paraspinal muscles, distinguishing it from passive and active aquatic therapies, and serves as the standard comparator in this crossover study.