Breathing frequencies of northern elephant seals at sea and on land revealed by heart rate spectral analysis
Breathing frequencies of northern elephant seals at sea and on land revealed by heart rate spectral analysis
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DOI：
10.1016/s0034-5687(00)00168-7
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发表时间：
2000-10-01
期刊：
影响因子：
--
通讯作者：
Jones, DR
中科院分区：
文献类型：
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作者：
Andrews, RD;Costa, DP;Jones, DR
象海豹在海上和陆地上的呼吸都是间歇性的，而且在这两种情况下都会出现令人惊讶的长时间的呼吸暂停。一个重要的区别是，在海上从呼吸暂停期恢复要快得多，这可能部分是由于呼吸反应的差异。呼吸频率的少年北方海象潜水在海上和陆地上休息估计从时间频率图的维格纳分布的心率变异性。在实验室中同时直接测量呼吸和估计呼吸频率（fR）证明估计误差小（平均值± S.D.）。= 1.05 +/- 1.23%），并且与fR的幅度无关。海上正常呼吸fR比陆地高2.4倍（分别为22.0 +/- 2.0和9.2 +/- 1.3次呼吸min（-1）），有助于从前一次潜水中快速恢复，并使海上呼吸暂停时间比陆地增加34%。海上的总体fR（正常呼吸中的呼吸次数除以呼吸暂停+正常呼吸周期的总时间）为2.3 +/- 0.6次呼吸min（-1），与陆地上的频率没有区别，并且与之前的潜水持续时间呈负相关，这表明长时间潜水的新陈代谢可能会减少。(C)2000 Elsevier Science B. V.保留所有权利。
Elephant seals breathe episodically at sea and on land and surprisingly long apnoeas occur in both situations. An important difference is that recovery from apnoeic periods is much quicker at sea, which might be due, in part, to differences in the ventilatory response. Respiratory frequencies of juvenile northern elephant seals diving at sea and resting on land were estimated from time-frequency maps of the Wigner distribution of heart rate variability. Simultaneous direct measurement of respiration and estimation of respiratory frequency (fR) in the laboratory demonstrated that the error of estimation was small (mean +/- S.D. = 1.05 +/- 1.23%) and was independent of the magnitude of fR. Eupnoeic fR at sea was 2.4 times higher than on land (22.0 +/- 2.0 vs. 9.2 +/- 1.3 breaths min(-1) respectively), facilitating quick recovery from the preceding dive and allowing a 34% increase in time spent apnoeic at sea versus on land. The overall fR (no. of breaths in a eupnoea divided by the total time of the apnoea + eupnoea cycle) of 2.3 +/- 0.6 breaths min(-1) at sea was no different from the rate on land and was inversely related to the preceding dive duration, suggesting that metabolism on longer dives may be reduced. (C) 2000 Elsevier Science B.V. All rights reserved.