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Saturation diving; physiology and pathophysiology.

Alf O Brubakk1, John A S Ross, Stephen R Thom

  • 1Department of Circulation and Medical Imaging, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway.

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Saturation divers face risks from hyperoxia and decompression, potentially damaging tissues and impairing endothelial function. Antioxidant status and exercise are key to mitigating these health impacts in diving environments.

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Area of Science:

  • Physiology
  • Occupational Health
  • Biomedical Science

Background:

  • Saturation diving involves prolonged exposure to increased oxygen partial pressure and potential toxins.
  • Divers experience physiological stress from hyperoxia, gas bubbles, and decompression, impacting cellular structures and endothelial function.
  • Antioxidant status, influenced by diet and genetics, plays a crucial role in protecting divers against oxidative stress.

Purpose of the Study:

  • To explore the physiological challenges and potential health impacts of saturation diving.
  • To investigate the role of reactive oxygen species (ROS) and heat shock proteins (HSPs) in diving-related injuries.
  • To assess the importance of endothelial function and physical activity for diver health.

Main Methods:

  • Review of existing literature on saturation diving physiology and health risks.
  • Analysis of the effects of hyperoxia, decompression, and oxidative stress on cellular and vascular health.
  • Consideration of the role of antioxidant defense mechanisms and heat shock proteins.

Main Results:

  • Hyperoxia and decompression can lead to reactive oxygen species (ROS) production, causing cellular damage and endothelial dysfunction.
  • Heat shock proteins (HSPs) may have both detrimental and protective effects on endothelial function.
  • While decompression sickness (DCS) is reduced, underreporting and risks during rapid ascents persist, with decompression also producing endothelial microparticles.

Conclusions:

  • Saturation diving, while generally safe, requires further understanding of underlying pathophysiological mechanisms, particularly concerning long-term hyperoxia and microparticle effects on the endothelium.
  • Maintaining adequate antioxidant status and engaging in regular physical exercise are recommended for saturation divers to support endothelial health.
  • Limited knowledge exists regarding the long-term health consequences and the precise impact of diving stressors on diver physiology.