The influences of hyperbaric oxygen therapy with a lower pressure and oxygen concentration than previous methods on physiological mechanisms in dogs

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  • ISHIBASHI Maki
    Department of Veterinary Clinical Medicine, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1–58 Rinku-ohrai-kita, Izumisano, Osaka 598–8531, Japan
  • HAYASHI Akiyoshi
    Department of Veterinary Clinical Medicine, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1–58 Rinku-ohrai-kita, Izumisano, Osaka 598–8531, Japan
  • AKIYOSHI Hideo
    Department of Veterinary Clinical Medicine, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1–58 Rinku-ohrai-kita, Izumisano, Osaka 598–8531, Japan
  • OHASHI Fumihito
    Department of Veterinary Clinical Medicine, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1–58 Rinku-ohrai-kita, Izumisano, Osaka 598–8531, Japan

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Recently, hyperbaric oxygen therapy with a lower pressure and oxygen concentration (L-HBOT) than previous methods has been used for dogs in Japan; however, the influences of L-HBOT on dogs have not been clarified. To verify the influences of L-HBOT on physiological mechanism in dogs, we investigated blood gas parameters, glutathione peroxidase (GPx) activity, heart rate variability, stress-related hormones and skin conductance (SC) in 4 clinically normal beagle dogs with catheters in their carotid arteries and jugular veins when they were quiet, after running, after receiving L-HBOT (30% oxygen concentration, 1.3 atmospheres absolute, 30 min) or after not receiving L-HBOT. The results showed there were no changes in blood gas parameters, heart rate variability and catecholamine levels after L-HBOT. GPx activity was significantly higher, and the SC and cortisol level were lower in dogs that received L-HBOT than those when they were quiet. These results suggested that L-HBOT may have a small influence on oxygenation dynamics, activate antioxidant enzymes such as GPx, restrain autonomic nervous activity and control the balance between oxidation and antioxidation inside the body.

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