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首页> 外文OA文献 >In situ cardiac performance of Atlantic cod (Gadus morhua) at cold temperatures: long-term acclimation, acute thermal challenge and the role of adrenaline
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In situ cardiac performance of Atlantic cod (Gadus morhua) at cold temperatures: long-term acclimation, acute thermal challenge and the role of adrenaline

机译：低温条件下大西洋鳕鱼的原位心脏表现：长期适应，急性热刺激和肾上腺素的作用

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The resting and maximum in situ cardiac performance of Newfoundland Atlantic cod (Gadus morhua) acclimated to 10, 4 and 0°C were measured at their respective acclimation temperatures, and when acutely exposed to temperature changes: i.e. hearts from 10°C fish cooled to 4°C, and hearts from 4°C fish measured at 10 and 0°C. Intrinsic heart rate (f(H)) decreased from 41 beats min(-1) at 10°C to 33 beats min(-1) at 4°C and 25 beats min(-1) at 0°C. However, this degree of thermal dependency was not reflected in maximal cardiac output (Q(max) values were ~44, ~37 and ~34 ml min(-1) kg(-1) at 10, 4 and 0°C, respectively). Further, cardiac scope showed a slight positive compensation between 4 and 0°C (Q(10)=1.7), and full, if not a slight over compensation between 10 and 4°C (Q(10)=0.9). The maximal performance of hearts exposed to an acute decrease in temperature (i.e. from 10 to 4°C and 4 to 0°C) was comparable to that measured for hearts from 4°C- and 0°C-acclimated fish, respectively. In contrast, 4°C-acclimated hearts significantly out-performed 10°C-acclimated hearts when tested at a common temperature of 10°C (in terms of both Q(max) and power output). Only minimal differences in cardiac function were seen between hearts stimulated with basal (5 nmol l(-1)) versus maximal (200 nmol l(-1)) levels of adrenaline, the effects of which were not temperature dependent. These results: (1) show that maximum performance of the isolated cod heart is not compromised by exposure to cold temperatures; and (2) support data from other studies, which show that, in contrast to salmonids, cod cardiac performance/myocardial contractility is not dependent upon humoral adrenergic stimulation.
机译：在各自的适应温度下，以及在急性暴露于温度变化的情况下，分别测量了纽芬兰大西洋鳕鱼（加德斯莫尔瓦犬）在10、4和0°C时的静止和最大原位心脏性能：即从10°C鱼的心脏冷却至4°C，在4°C和10°C和0°C下测得的心。本质心率（f（H））从10°C时的41次min（-1）降至4°C时的33次min（-1）和0°C时的25次min（-1）。但是，这种热依赖性程度并未反映在最大心输出量上（在10°C，4°C和0°C下，Q（max）值分别为〜44，〜37和〜34 ml min（-1）kg（-1）。 ）。此外，心脏镜在4至0°C（Q（10）= 1.7）之间显示出轻微的正补偿，而在10至4°C之间（Q（10）= 0.9）则显示出完全的，过度的补偿。暴露于温度急剧下降（即从10到4°C和4到0°C）的心脏的最大性能分别与适应4°C和0°C的鱼的心脏的最大性能相当。相反，在10°C的普通温度下（就Q（max）和功率输出而言）进行测试时，适应4°C的心脏显着优于适应10°C的心脏。肾上腺素的基础水平（5 nmol l（-1））与最大水平（200 nmol l（-1））刺激的心脏之间仅观察到心脏功能的最小差异，其影响与温度无关。这些结果：（1）表明，暴露于寒冷的温度不会损害鳕鱼离体心脏的最大功能； （2）其他研究的支持数据表明，与鲑鱼相比，鳕鱼的心脏性能/心肌收缩力不依赖于体液肾上腺素能刺激。

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