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Training Rats to Voluntarily Dive Underwater: Investigations of the Mammalian Diving Response
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Physiological responses to prolonged saturation diving: a field-based pilot study.

Sanjoy Deb1, Katherine Burgess2, Paul Swinton2

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Undersea & Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc
|December 28, 2017
PubMed
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Saturation diving significantly reduced hemoglobin and plasma volume in divers, with some airway inflammation. Fitness measures like flexibility remained unchanged, highlighting physiological impacts of extreme environments.

Keywords:
hyperbaricdivingexercise physiologyextreme environmenthyperoxicoccupational physiology

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Area of Science:

  • Physiological responses to extreme environments
  • Occupational diving medicine
  • Human performance under pressure

Background:

  • Operational saturation diving involves prolonged exposure to extreme environments.
  • Understanding physiological changes in saturation divers is crucial for safety and performance.
  • Previous research has not comprehensively assessed multiple physiological parameters post-dive.

Purpose of the Study:

  • To evaluate the effects of saturation diving on airway inflammation (exhaled nitric oxide), fitness (flexibility, aerobic capacity), and hematological variables.
  • To investigate physiological adaptations and potential deconditioning in saturation divers.
  • To establish a baseline for future research on diver health.

Main Methods:

  • Six saturation divers participated in a 26-day operational dive.
  • A repeated-measures test battery was administered pre-dive, post-dive, and 24 hours post-dive.
  • Measurements included exhaled nitric oxide, hip flexion (sit and reach), hemoglobin, and plasma volume.

Main Results:

  • Significant reduction in hemoglobin concentration (P<0.001) and plasma volume from pre- to post-dive.
  • Hemoglobin levels recovered to baseline within 24 hours post-dive (P=0.04).
  • Non-significant changes in airway inflammation and hip flexion, with notable inter-individual variability in FeNo.

Conclusions:

  • Saturation diving induces significant hematological changes, including reduced hemoglobin and plasma volume.
  • While some physiological markers show adaptation, further research is needed to understand long-term effects and inter-individual responses.
  • This study provides novel insights into the multifaceted physiological impacts of operational saturation diving.