Body Temperature Dynamics in Small Mammals and Birds in 10-120-min Period Range
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Bulletin of Experimental Biology and Medicine, Vol. 169, No. 6, October, 2020
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BIOPHYSICS AND BIOCHEMISTRY Body Temperature Dynamics in Small Mammals and Birds in 10-120-min Period Range
M. Е. Diatroptov1, V. A. Panchelyuga2, and M. S. Panchelyuga2 Translated from Byulleten’ Eksperimental’noi Biologii i Meditsiny, Vol. 169, No. 6, pp. 706-711, June, 2020 Original article submitted December 26, 2019 The dynamics of intraperitoneal body temperature was analyzed in males of C57BL/6 mice and common greenfinches (Chloris chloris). Despite the membership in different classes, these mammals demonstrated the identical set of harmonics in body temperature spectra. The study revealed synchronicity of body temperature oscillations in distantly isolated animals. The data suggest that body temperature oscillations in 10-120-min (circahoralian) period range reflect the effect of an external environmental biotropic factor on temperature control in small mammals and birds. Key Words: ultradian rhythms; body temperature; external synchronizers; mammals and birds; circahoralian periods The ultradian rhythms of body temperature (BT) were examined in many works [6,8,10]. According to common view, BT oscillations with the periods in the minute range are determined by internal factors involved in the control of thermal homeostasis and probably implicated in up-regulation of organismal adaptive potencies [10]. However, there is a view that ultradian biorhythms can be synchronized by some external rhythmic or quasi-rhythmic environmental factors [4]. Specifically, the changes in rat motor activity correlate with oscillations of geomagnetic field [3]. Similarly, the yeast growth rate is characterized with several stable periods including the 160-min one, which had been also found in geomagnetic auroral electrojet (AE) index. Notably, this 160-min rhythm was observed synchronously in two independent experiments, which attests to its exogenous origin [2]. Normally, changes in BT depend on various physiological parameters and demonstrate circadian
and ultradian rhythms. For instance, there are 2-6-h rhythms of BT determined by a dopaminergic oscillator, which controls the active/resting cycles and which is not directly related to circadian system in the organism [7,8]. Probably, the low-amplitude oscillations in the minute range of the periods are determined by the changes in ANS tone [9]. It is also possible that this tone can be modulated by some external factors. Actually, the heart rate variability in healthy persons frequently coincides with oscillations of geomagnetic activity in the frequency range of 0.5-3.0 mHz [1]. However, there were no attempts to reveal the common nature of BT changes in various species. Our aim was to examine the basic rhythms of BT oscillations in 10-120-min range in C57BL/6 mice and in common greenfinches (Chloris chloris).
A. N. Severtsov Institute of Ecology and Evolution Problems, Russian Academy of Sciences, Moscow, Russia; 2Institute of Theoretical and Experimental Biophysics, Russian Academy of
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