Blood oxygen transport and depletion in diving emperor penguins.
Oxygen store management underlies dive performance and is dependent on the slow heart rate and peripheral vasoconstriction of the dive response to control tissue blood flow and oxygen uptake. Prior research has revealed two major patterns of muscle myoglobin saturation profiles during dives of emper...
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Online Access: | https://doi.org/10.1242/jeb.246832 https://pubmed.ncbi.nlm.nih.gov/38390686 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11006389/ |
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ftpubmed:38390686 2024-05-12T08:03:13+00:00 Blood oxygen transport and depletion in diving emperor penguins. Ponganis, Paul J Williams, Cassondra L Kendall-Bar, Jessica M 2024 Mar 15 https://doi.org/10.1242/jeb.246832 https://pubmed.ncbi.nlm.nih.gov/38390686 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11006389/ eng eng Silverchair Information Systems https://doi.org/10.1242/jeb.246832 https://pubmed.ncbi.nlm.nih.gov/38390686 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11006389/ © 2024. Published by The Company of Biologists Ltd. J Exp Biol ISSN:1477-9145 Volume:227 Issue:6 Arterial Arterio-venous shunt Hemoglobin saturation Vasoconstriction Venous Journal Article 2024 ftpubmed https://doi.org/10.1242/jeb.246832 2024-04-12T16:03:00Z Oxygen store management underlies dive performance and is dependent on the slow heart rate and peripheral vasoconstriction of the dive response to control tissue blood flow and oxygen uptake. Prior research has revealed two major patterns of muscle myoglobin saturation profiles during dives of emperor penguins. In Type A profiles, myoglobin desaturated rapidly, consistent with minimal muscle blood flow and low tissue oxygen uptake. Type B profiles, with fluctuating and slower declines in myoglobin saturation, were consistent with variable tissue blood flow patterns and tissue oxygen uptake during dives. We examined arterial and venous blood oxygen profiles to evaluate blood oxygen extraction and found two primary patterns of venous hemoglobin desaturation that complemented corresponding myoglobin saturation profiles. Type A venous profiles had a hemoglobin saturation that (a) increased/plateaued for most of a dive's duration, (b) only declined during the latter stages of ascent, and (c) often became arterialized [arterio-venous (a-v) shunting]. In Type B venous profiles, variable but progressive hemoglobin desaturation profiles were interrupted by inflections in the profile that were consistent with fluctuating tissue blood flow and oxygen uptake. End-of-dive saturation of arterial and Type A venous hemoglobin saturation profiles were not significantly different, but did differ from those of Type B venous profiles. These findings provide further support that the dive response of emperor penguins is a spectrum of cardiac and vascular components (including a-v shunting) that are dependent on the nature and demands of a given dive and even of a given segment of a dive. Article in Journal/Newspaper Emperor penguins PubMed Central (PMC) Journal of Experimental Biology 227 6 |
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Open Polar |
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PubMed Central (PMC) |
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ftpubmed |
language |
English |
topic |
Arterial Arterio-venous shunt Hemoglobin saturation Vasoconstriction Venous |
spellingShingle |
Arterial Arterio-venous shunt Hemoglobin saturation Vasoconstriction Venous Ponganis, Paul J Williams, Cassondra L Kendall-Bar, Jessica M Blood oxygen transport and depletion in diving emperor penguins. |
topic_facet |
Arterial Arterio-venous shunt Hemoglobin saturation Vasoconstriction Venous |
description |
Oxygen store management underlies dive performance and is dependent on the slow heart rate and peripheral vasoconstriction of the dive response to control tissue blood flow and oxygen uptake. Prior research has revealed two major patterns of muscle myoglobin saturation profiles during dives of emperor penguins. In Type A profiles, myoglobin desaturated rapidly, consistent with minimal muscle blood flow and low tissue oxygen uptake. Type B profiles, with fluctuating and slower declines in myoglobin saturation, were consistent with variable tissue blood flow patterns and tissue oxygen uptake during dives. We examined arterial and venous blood oxygen profiles to evaluate blood oxygen extraction and found two primary patterns of venous hemoglobin desaturation that complemented corresponding myoglobin saturation profiles. Type A venous profiles had a hemoglobin saturation that (a) increased/plateaued for most of a dive's duration, (b) only declined during the latter stages of ascent, and (c) often became arterialized [arterio-venous (a-v) shunting]. In Type B venous profiles, variable but progressive hemoglobin desaturation profiles were interrupted by inflections in the profile that were consistent with fluctuating tissue blood flow and oxygen uptake. End-of-dive saturation of arterial and Type A venous hemoglobin saturation profiles were not significantly different, but did differ from those of Type B venous profiles. These findings provide further support that the dive response of emperor penguins is a spectrum of cardiac and vascular components (including a-v shunting) that are dependent on the nature and demands of a given dive and even of a given segment of a dive. |
format |
Article in Journal/Newspaper |
author |
Ponganis, Paul J Williams, Cassondra L Kendall-Bar, Jessica M |
author_facet |
Ponganis, Paul J Williams, Cassondra L Kendall-Bar, Jessica M |
author_sort |
Ponganis, Paul J |
title |
Blood oxygen transport and depletion in diving emperor penguins. |
title_short |
Blood oxygen transport and depletion in diving emperor penguins. |
title_full |
Blood oxygen transport and depletion in diving emperor penguins. |
title_fullStr |
Blood oxygen transport and depletion in diving emperor penguins. |
title_full_unstemmed |
Blood oxygen transport and depletion in diving emperor penguins. |
title_sort |
blood oxygen transport and depletion in diving emperor penguins. |
publisher |
Silverchair Information Systems |
publishDate |
2024 |
url |
https://doi.org/10.1242/jeb.246832 https://pubmed.ncbi.nlm.nih.gov/38390686 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11006389/ |
genre |
Emperor penguins |
genre_facet |
Emperor penguins |
op_source |
J Exp Biol ISSN:1477-9145 Volume:227 Issue:6 |
op_relation |
https://doi.org/10.1242/jeb.246832 https://pubmed.ncbi.nlm.nih.gov/38390686 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11006389/ |
op_rights |
© 2024. Published by The Company of Biologists Ltd. |
op_doi |
https://doi.org/10.1242/jeb.246832 |
container_title |
Journal of Experimental Biology |
container_volume |
227 |
container_issue |
6 |
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1798845319630290944 |