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Arterial blood gases in divers at surface after prolonged breath-hold. Bosco, Gerardo Paganini, Matteo Rizzato, Alex Martani, Luca Garetto, Giacomo Lion, Jacopo Camporesi, Enrico M Moon, Richard E 2020-04-16T14:40:29Z 2020-04-16T14:40:29Z 2020-02
dc.identifier 10.1007/s00421-019-04296-2
dc.identifier.issn 1439-6319
dc.identifier.issn 1439-6327
dc.description.abstract PURPOSE:Adaptations during voluntary breath-hold diving have been increasingly investigated since these athletes are exposed to critical hypoxia during the ascent. However, only a limited amount of literature explored the pathophysiological mechanisms underlying this phenomenon. This is the first study to measure arterial blood gases immediately before the end of a breath-hold in real conditions. METHODS:Six well-trained breath-hold divers were enrolled for the experiment held at the "Y-40 THE DEEP JOY" pool (Montegrotto Terme, Padova, Italy). Before the experiment, an arterial cannula was inserted in the radial artery of the non-dominant limb. All divers performed: a breath-hold while moving at the surface using a sea-bob; a sled-assisted breath-hold dive to 42 m; and a breath-hold dive to 42 m with fins. Arterial blood samples were obtained in four conditions: one at rest before submersion and one at the end of each breath-hold. RESULTS:No diving-related complications were observed. The arterial partial pressure of oxygen (96.2 ± 7.0 mmHg at rest, mean ± SD) decreased, particularly after the sled-assisted dive (39.8 ± 8.7 mmHg), and especially after the dive with fins (31.6 ± 17.0 mmHg). The arterial partial pressure of CO2 varied somewhat but after each study was close to normal (38.2 ± 3.0 mmHg at rest; 31.4 ± 3.7 mmHg after the sled-assisted dive; 36.1 ± 5.3 after the dive with fins). CONCLUSION:We confirmed that the arterial partial pressure of oxygen reaches hazardously low values at the end of breath-hold, especially after the dive performed with voluntary effort. Critical hypoxia can occur in breath-hold divers even without symptoms.
dc.language eng
dc.publisher Springer Science and Business Media LLC
dc.relation.ispartof European journal of applied physiology
dc.relation.isversionof 10.1007/s00421-019-04296-2
dc.subject Arterial blood gas
dc.subject Blood gas analysis
dc.subject Breath-hold diving
dc.subject Physiology
dc.subject Underwater
dc.title Arterial blood gases in divers at surface after prolonged breath-hold.
dc.type Journal article Moon, Richard E|0108118 2020-04-16T14:40:28Z
pubs.begin-page 505
pubs.end-page 512
pubs.issue 2
pubs.organisational-group School of Medicine
pubs.organisational-group Medicine, Pulmonary, Allergy, and Critical Care Medicine
pubs.organisational-group Anesthesiology, General, Vascular, High Risk Transplant & Critical Care
pubs.organisational-group Duke
pubs.organisational-group Medicine
pubs.organisational-group Clinical Science Departments
pubs.organisational-group Anesthesiology
pubs.publication-status Published
pubs.volume 120
duke.contributor.orcid Moon, Richard E|0000-0003-4432-0332

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