Underwater treadmill therapy is primarily used in veterinary patients to enable early return to function and improve muscle strength after limb, neck, or back surgery or injury and improve range of motion in compromised joints. Underwater treadmill therapy is also becoming more frequently used in animals for athletic conditioning and weight management.

Orthopedic and neurologic patients can benefit from earlier return to function with underwater treadmill therapy. It provides a reduced weight-bearing environment that increases functional use of a limb without marked weight loading and resultant discomfort to a postsurgical joint. The water’s viscosity also provides increased proprioceptive and tactile stimulation.

In addition, most postsurgical and neurologic patients have some degree of muscle atrophy or loss of strength. Muscle atrophy also occurs secondary to osteoarthritis and, to a smaller degree, as a result of normal aging. Walking on an underwater treadmill once a week or more can help patients with muscle atrophy improve strength and mobility because of the increased resistance to forward motion. More frequent sessions, as often as every other day, can help build strength even faster.

Many dogs that are unwilling to use a limb after injury will use the limb to help maintain balance and stability in the water because of increased comfort and because of the resistance to forward motion in the functional limbs, which slows the gait pattern.  An underwater treadmill allows motion in a low-weight-bearing environment to help strengthen the muscles and tendons that surround this new joint as well as maintain strength and balance in the rest of the body.

Injured joints often show reduced range of motion. Underwater treadmill walking allows a correct but exaggerated gait pattern, which improves joint flexion. The most common example of a patient that would benefit from this exaggerated gait pattern is a patient with limited stifle and hock flexion after undergoing surgery to repair a cranial cruciate ligament injury.

The pain relief provided by warm water facilitates muscle relaxation and tendon stretch in situations in which splinting, protection, or contracture has occurred.

Athletes benefit from conditioning on an underwater treadmill both in muscle strengthening and cardiovascular endurance because of water’s increased resistance.

Finally, obese or overweight patients can exercise more safely in a buoyant environment than on land. The water’s buoyancy reduces weight-bearing stress while at the same time its resistance increases metabolic demand and improves muscle strength.

-excerpt from DVM360