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Selected Contribution: Role of spleen emptying in prolonging apneas in humans
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Department of Animal Physiology, Lund University.
Department of Surgery, Lund University Hospital, S-221 85 Lund.
Department of Surgery, Lund University Hospital, S-221 85 Lund.
Responsible organisation
2001 (English)In: Journal of applied physiology, ISSN 8750-7587, E-ISSN 1522-1601, Vol. 90, no 4, 1623-1629 p.Article in journal (Refereed) Published
Abstract [en]

This study addressed the interaction between short-term adaptation to apneas with face immersion and erythrocyte release from the spleen. Twenty healthy volunteers, including ten splenectomized subjects, participated. After prone rest, they performed five maximal-duration apneas with face immersion in 10°C water, with 2-min intervals. Cardiorespiratory parameters and venous blood samples were collected. In subjects with spleens, hematocrit and hemoglobin concentration increased by 6.4% and 3.3%, respectively, over the serial apneas and returned to baseline 10 min after the series. A delay of the physiological breaking point of apnea, by 30.5% (17 s), was seen only in this group. These parameters did not change in the splenectomized group. Plasma protein concentration, preapneic alveolar PCO2, inspired lung volume, and diving bradycardia remained unchanged throughout the series in both groups. Serial apneas thus triggered the hematological changes that have been previously observed after long apneic diving shifts; they were rapidly reversed and did not occur in splenectomized subjects. This suggests that splenic contraction occurs in humans as a part of the diving response and may prolong repeated apneas.

Place, publisher, year, edition, pages
2001. Vol. 90, no 4, 1623-1629 p.
Keyword [en]
Blood pressure, Bradycardia, Breath-hold, Diving response, Vasoconstriction
National Category
Microbiology Sport and Fitness Sciences Physiology
Identifiers
URN: urn:nbn:se:miun:diva-2993ISI: 000167491500059PubMedID: 11247970Scopus ID: 2-s2.0-0035107586Local ID: 1613OAI: oai:DiVA.org:miun-2993DiVA: diva2:28025
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2016-10-11Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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  • text
  • asciidoc
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