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Ventilatory gas analysis in SCUBA divers using a surface-based measurement system.

R L Jones1, D Docherty, C A Gaul

  • 1Department of Medicine, University of Alberta.

Undersea & Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc
|November 21, 2007
PubMed
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Measuring underwater exercise gas exchange in divers is now possible. A new technique accurately measures oxygen consumption (VO2) and ventilation during self-contained underwater breathing apparatus (SCUBA) diving.

Area of Science:

  • Physiology
  • Biotechnology
  • Marine Biology

Background:

  • Measuring gas exchange in submerged divers presents technological challenges, particularly simulating underwater pressure on expired gas.
  • Existing methods are often complicated by the risk of regulator free-flow, affecting data accuracy.

Purpose of the Study:

  • To present a novel, simple method for acquiring expired gas from exercising divers for surface analysis.
  • To validate this technique for measuring metabolic responses during self-contained underwater breathing apparatus (SCUBA) diving.

Main Methods:

  • A flat collapsible tube was used downstream of the SCUBA regulator's expiration valve to collect expired gas.
  • 12 divers underwent graded exercise to exhaustion, swimming on the surface and underwater at 1.8m using a tethered system.

Related Experiment Videos

  • Expired gas was analyzed using a standard metabolic measurement system.

    • Main Results:

    • Peak minute ventilation during surface swimming and SCUBA diving was not significantly different.
    • Peak oxygen consumption (VO2) was significantly lower during SCUBA diving compared to surface swimming (p < 0.0001).
    • A significant positive correlation was found between peak VO2 during SCUBA and surface swimming (p = 0.0002).

    Conclusions:

    • The developed technique allows for accurate measurement of VO2 and ventilation in SCUBA divers during underwater exercise.
    • This simple method is valuable for researchers studying the energy demands of shallow water diving activities.