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Effects of pair housing on diurnal rhythms of heart rate and heart rate variability in miniature swine

机译:配对住房对小型猪心率昼夜节律和心率变异性的影响

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This study investigated the effects of pair housing on diurnal rhythms of heart rate and autonomic nervous activity in miniature swine. For this purpose, six adult Gottingen miniature swine were initially housed individually in an animal cage. Then, two of each swine were housed in a large cage together for 3 weeks. After that swine were separated into individual cages again. During this experimental procedure, electrocardiogram (ECG) was recorded with a Holter ECG recorder. Autonomic nervous activity was evaluated by power spectral analysis of heart rate variability. Heart rate and autonomic nervous activity clearly showed a diurnal rhythm in miniature swine housed in individual cages. When two swine were housed together, heart rate was significantly increased throughout the day and diurnal rhythm disappeared. Although these changes gradually recovered to basal levels, these parameters had not completely returned to basal levels even after 2 weeks. Heart rate was still higher than the initial level just after swine were re-housed in their own individual cages. Heart rate and autonomic nervous activity returned to basal levels about 2 weeks after re-housing. Further, heart rate in some swine decreased below their initial levels. These results suggest that it takes miniature swine at least 2 weeks to adapt to different circumstances. Furthermore, the power spectral analysis of heart rate variability can be used as a useful method in a study for answering controversial issues related to stress response.
机译:这项研究调查了配对住房对小型猪心律和自主神经活动的昼夜节律的影响。为此,最初将六只成年的哥廷根小型猪单独饲养在一个动物笼中。然后,将每只猪中的两只猪一起放在大笼子中饲养3周。之后,将猪再次分成单独的笼子。在此实验过程中,用Holter ECG记录仪记录心电图(ECG)。通过心率变异性的功率谱分析评估自主神经活动。心率和自主神经活动清楚地表明,关在笼子里的小型猪的昼夜节律。当将两只猪放在一起时,心率全天显着增加,昼夜节律消失。尽管这些变化逐渐恢复到基础水平,但即使在2周后,这些参数仍未完全恢复到基础水平。将猪重新安置在自己的笼子中之后,心率仍高于初始水平。重新安置后约两周,心率和自主神经活动恢复至基础水平。此外,某些猪的心率下降到其初始水平以下。这些结果表明小型猪至少需要2周才能适应不同的情况。此外,心率变异性的功率谱分析可以用作研究中与压力反应有关的有争议问题的有用方法。

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