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Speed of spleen volume changes evoked by serial apneas
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Responsible organisation
2005 (English)In: European Journal of Applied Physiology, ISSN 1439-6319, Vol. 93, no 4, 447-452 p.Article in journal (Refereed) Published
Abstract [en]

Diving mammals may enhance dive duration by injecting extra erythrocytes into the circulation by spleen contraction. This mechanism may also be important for apneic duration in humans. We studied the speed and magnitude of spleen volume changes evoked by serial apneas, and the associated changes in hematocrit (Hct) and hemoglobin (Hb) concentration, diving response and apneic duration. Three maximal apneas separated by 2 min rest elicited spleen contraction in all ten subjects, by a mean of 49 (27) ml (18%; P<0.001). During the same period, Hct and Hb rose by 2.2 and 2.4% respectively (P<0.01 and P<0.001), and apneic duration rose by 20 s (22% P<0.05). The mean heart rate reduction of the diving response was 15%, which remained the same throughout the apnea series. While the diving response was completely reversed between the apneas, spleen size was not recovered until 8–9 min after the final apnea corresponding with recovery of Hct and Hb. Thus, although the spleen contraction may be associated with the cardiovascular diving response, it is likely to be triggered by different mechanisms, and it may remain activated between dives spaced by short pauses. The two adjustments may provide a fast, quickly reversed, and a slow, but long-lasting, way of shifting to a diving mode in humans

Place, publisher, year, edition, pages
2005. Vol. 93, no 4, 447-452 p.
Keyword [en]
Speed of spleen volume changes evoked by serial apneas.
National Category
Microbiology Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-2195DOI: 10.1007/s00421-004-1224-0ISI: 000225911900010Local ID: 1592OAI: oai:DiVA.org:miun-2195DiVA: diva2:27227
Note
VR-Medicine, ExternalAvailable from: 2008-09-30 Created: 2009-06-08 Last updated: 2009-11-02Bibliographically approved

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Schagatay, ErikaHaughey, Helena
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CiteExportLink to record
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Cite
Citation style
  • apa
  • ieee
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  • Other style
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  • de-DE
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  • en-US
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