| The objective was to find the influence of geomagnetic activity (GMA) on diurnal dynamics of rats resistance to acute hypoxia.METHODS. The resistance to acute hypoxia of rats male Wistar (mass 150-180 g)was estimated by life time (LT) in sec after “rise” to “altitude” 11.5 km above sea level in different seasons of the year. The С=0,34 and С=0,66 quantiles of LT values distribution served as boundaries for LT of low (LR),middle (MR), high resistant to hypoxia rats (HR). The GMA for an hours of LT determination was assessed by K-indices : less than 3 – quiet (QGMA), from 3 to 5 – disturbed (DGMA). Time rows of LT values were studied by spectral analysis and cosinor-analysis. Nonparametric methods of statistics were used too: analysis of variance, correlation analysis, Dunn’s method and Х2 . RESULTSLTS. diurnal dynamics was determined by circadian and ultradian rhythms. The influence of GMA and day time on LT was found (p <0,05-0,01), GMA alteration being accompanied by LT rhythms alteration. The basic rhythmsduring QGMA were chiefly circadian rhythms, more rarely ultradian ones. The part of ultradian rhythms increased (2.5 times), the part of circadian rhythms decreased (3.5 times) among LT basic rhythms during DGMA in winter and spring, the rats rhythms periods (except those of HR and MR in spring) being shorter than those during QGMA (1.2-4.0 times). About 70 % of the number of the circadian and ultradian LT rhythms revealed during QGMA changed during DGMA for the year as a whole. At different day periods of all seasons of the year LT decreased 2-3 times more often than increased. LT altered almost 2 times more often in the middle and at the end of the day than at its beginning. Stages of LT alteration were found as GMA disturbed during a day and a year and as well as after passing different time after its disturbance. CONCLUSION. GMA disturbance is accompanied by alteration of circadian and ultradian LT rhythms number and their parameters, that stipulated increase of fluctuating LT alterations during a day. During GMA disturbance life time of low Resistant more often decreases particularly in autumn. |
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