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Heart rate and cardiac response to exercise during voluntary dives in captive sea turtles (Cheloniidae)

In chelonids, oxygen is primarily stored in the lungs during a dive. Therefore, management of blood oxygen transportation to peripheral tissues by cardiovascular adjustments during submergence is crucial to maximize their dive duration, and consequently, the time spent for ecological activities such...

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Autores principales: Okuyama, Junichi, Shiozawa, Maika, Shiode, Daisuke
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Company of Biologists Ltd 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7055368/
https://www.ncbi.nlm.nih.gov/pubmed/32033966
http://dx.doi.org/10.1242/bio.049247
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author Okuyama, Junichi
Shiozawa, Maika
Shiode, Daisuke
author_facet Okuyama, Junichi
Shiozawa, Maika
Shiode, Daisuke
author_sort Okuyama, Junichi
collection PubMed
description In chelonids, oxygen is primarily stored in the lungs during a dive. Therefore, management of blood oxygen transportation to peripheral tissues by cardiovascular adjustments during submergence is crucial to maximize their dive duration, and consequently, the time spent for ecological activities such as foraging. However, the cardiac response to exercise has rarely been examined in sea turtles. In this study, heart rate and its relationship with exercise during voluntary dives were determined in six captive green turtles (19.4±1.5 kg) by simultaneously recording depth, acceleration and electrocardiogram. Our results demonstrated that the heart rate of green turtles was generally low (11.1±0.4 bpm) during resting dives, but they often exhibited instantaneously extreme tachycardia (up to 78.4 bpm). Green turtles elevated their heart rate up to 39.8±1.5 bpm during ventilation after resting dives, while up to 33.1±1.4 bpm after active dives. The heart rate immediately elevated with onset of exercise, and increased linearly with exercise. This result may indicate that turtles immediately need to transport oxygen from the lungs to peripheral tissues by pulmonary and systemic circulations to meet the metabolic demands of exercise because they mainly store oxygen in their lungs.
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spelling pubmed-70553682020-03-04 Heart rate and cardiac response to exercise during voluntary dives in captive sea turtles (Cheloniidae) Okuyama, Junichi Shiozawa, Maika Shiode, Daisuke Biol Open Research Article In chelonids, oxygen is primarily stored in the lungs during a dive. Therefore, management of blood oxygen transportation to peripheral tissues by cardiovascular adjustments during submergence is crucial to maximize their dive duration, and consequently, the time spent for ecological activities such as foraging. However, the cardiac response to exercise has rarely been examined in sea turtles. In this study, heart rate and its relationship with exercise during voluntary dives were determined in six captive green turtles (19.4±1.5 kg) by simultaneously recording depth, acceleration and electrocardiogram. Our results demonstrated that the heart rate of green turtles was generally low (11.1±0.4 bpm) during resting dives, but they often exhibited instantaneously extreme tachycardia (up to 78.4 bpm). Green turtles elevated their heart rate up to 39.8±1.5 bpm during ventilation after resting dives, while up to 33.1±1.4 bpm after active dives. The heart rate immediately elevated with onset of exercise, and increased linearly with exercise. This result may indicate that turtles immediately need to transport oxygen from the lungs to peripheral tissues by pulmonary and systemic circulations to meet the metabolic demands of exercise because they mainly store oxygen in their lungs. The Company of Biologists Ltd 2020-02-25 /pmc/articles/PMC7055368/ /pubmed/32033966 http://dx.doi.org/10.1242/bio.049247 Text en © 2020. Published by The Company of Biologists Ltd http://creativecommons.org/licenses/by/4.0This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.
spellingShingle Research Article
Okuyama, Junichi
Shiozawa, Maika
Shiode, Daisuke
Heart rate and cardiac response to exercise during voluntary dives in captive sea turtles (Cheloniidae)
title Heart rate and cardiac response to exercise during voluntary dives in captive sea turtles (Cheloniidae)
title_full Heart rate and cardiac response to exercise during voluntary dives in captive sea turtles (Cheloniidae)
title_fullStr Heart rate and cardiac response to exercise during voluntary dives in captive sea turtles (Cheloniidae)
title_full_unstemmed Heart rate and cardiac response to exercise during voluntary dives in captive sea turtles (Cheloniidae)
title_short Heart rate and cardiac response to exercise during voluntary dives in captive sea turtles (Cheloniidae)
title_sort heart rate and cardiac response to exercise during voluntary dives in captive sea turtles (cheloniidae)
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7055368/
https://www.ncbi.nlm.nih.gov/pubmed/32033966
http://dx.doi.org/10.1242/bio.049247
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