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Nature has proven that healing can not take place without appropriate oxygen levels in the body’s tissues. Oxygen given under normal atmospheric pressure is not enough to raise tissue oxygen levels to reverse this lack of oxygen because red blood cells cannot carry and release enough extra oxygen.

However, putting a horse in a hyperbaric chamber and increasing the atmospheric pressure to much greater than normal is very effective in enhancing the oxygen-carrying ability of the blood and other fluids in the body to about 15-20 times more because oxygen is forced into the plasma in addition to being carried by the red blood cells.

In otherwords, to overcome the oxygen starvation and raise tissue oxygen levels high enough for optimal healing to occur, the oxygen must be delivered under increased atmospheric pressure – Hyperbaric oxygen therapy

What is the term "Hyperbaric" mean?  Hyper - referred to as "more" and Baric - related to "pressure". Thus,  Hyperbaric - More Pressure.

How does Hyperbaric Oxygen Therapy works:

Hyperbaric Oxygen Therapy (HBOT) is a medical treatment in which a patient breathes 100% oxygen inside an enclosed chamber while the pressure is controlled and increased to greater than atmospheric pressure resulting in increased oxygen delivery to all the body tissues. In short, hyperbaric oxygen therapy involves oxygen as a medium of gas and an enclosed chamber as a tool to deliver oxygen at greater pressures. Under these conditions, lungs can gather more oxygen than would be possible breathing pure oxygen at normal air pressure following the basic gas physics laws.

In normal circumstances, oxygen is transported throughout the body only by red blood cells, and by way of hyperbaric oxygen therapy, more oxygen is dissolved not only through red blood cells but also into the blood plasma, blood cells, cerebral-spinal fluid and other bodily fluids.

How is this technology available?

Hyperbaric chambers designed to treat horses are large, heavy, and complex to produce. The design is constantly being updated, and the newest models resemble circular stalls with enough room for a horse to move around and even lie down during treatment.