Heart rate and cardiac response to exercise during voluntary dives in captive sea turtles (Cheloniidae)
Heart rate and cardiac response to exercise during voluntary dives in captive sea turtles (Cheloniidae)
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DOI：
10.1242/bio.049247
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发表时间：
2020-02-01
期刊：
影响因子：
2.4
通讯作者：
Shiode, Daisuke
中科院分区：
文献类型：
--
作者：
Okuyama, Junichi;Shiozawa, Maika;Shiode, Daisuke
在龟类动物中，氧气在潜水时主要储存在肺部。因此，在潜水过程中，通过心血管调节将血氧输送到外周组织的管理对于最大限度地延长潜水时间至关重要，因此，用于生态活动（如觅食）的时间也至关重要。然而，运动对心脏的反应很少在海龟中进行研究。本研究通过同步记录深度、加速度和心电图，测定了6只圈养绿色海龟（19.4 ± 1.5 kg）自愿潜水时的心率及其与运动的关系。我们的研究结果表明，绿色海龟的心率一般较低（11.1 +/- 0.4 bpm）在休息潜水，但他们往往表现出瞬间极端心动过速（高达78.4 bpm）。绿色海龟在休息潜水后的通气过程中将心率提高到39.8 +/- 1.5 bpm，而在活跃潜水后则提高到33.1 +/- 1.4 bpm。心率随运动开始而立即升高，并随运动呈线性增加。这一结果可能表明，海龟需要立即通过肺循环和体循环将氧气从肺部输送到外周组织，以满足运动的代谢需求，因为它们主要将氧气储存在肺部。
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.