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Biomedical subjects

T K Breus

Publications and source records attributed to T K Breus.

At least 19 recordsLinked to original sources
PubMed2006

[Geomagnetic pulsations and myocardial infarctions].

AIM: To clarify the role of geomagnetic micropulsations Pc1 (0.2-5s) in the range of the basic heart rate in an increase in the number of myocardial infarctions (MI) and sudden death (SD). MATERIAL AND METHODS: MI incidence rate in Moscow for 1979-1981, SD incidence rate in Bolgaria for 15 years for rural and urban population and data on micropulsations Pc1 were analysed. RESULTS: The number of MI rose both in Moscow and Bulgaria when the above micropulsations occurred during geomagnetic disturbances. Season variations of MI and SD incidence are related with a season trend in Pc1 duration with maximum in winter when even moderate magnetic disturbances are biotropic, while in summer even intensive magnetic disturbances do not cause extra number of MI. CONCLUSION: Factor intensifying influence of geomagnetic disturbances with Pc1 in winter may be low production of melatonin caused by light insufficiency.

Bulgaria↗
PubMed2002

The biological effects of solar activity.

The synchronization of biological circadian and circannual rhythms is broadly viewed as a result of photic solar effects. Evidence for non-photic solar effects on biota is also slowly being recognized. The ultrastructure of cardiomyocytes from rabbits, the time structure of blood pressure and heart rate of neonates, and the heart rate variability of human adults on earth and in space were examined during magnetically disturbed and quiet days, as were morbidity statistics. Alterations in both the about-daily (circadian) and about-weekly (circaseptan) components are observed during disturbed vs. quite days. The about-weekly period of neonatal blood pressure correlates with that of the local geomagnetic disturbance index K. Circaseptans which are seen early in human life and in various other forms of life, including unicells, may provide information about the possible site(s) of life's origins from an integrative as well as adaptive evolutionary perspective.

Animals↗
PubMed2001

Morphological and functional state of the heart during magnetic storm.

Magnetic storm modulates morphological and functional state of the heart and the related systems. Changes in cardiomyocyte ultrastructure induced by changes in geomagnetic activity were studied in experiments on rabbits. We describe a possible mechanism underlying changes in cardiac activity in intact animals induced by geomagnetic perturbations. The most pronounced alterations of cardiomyocyte ultrastructure were observed during the major phase of magnetic storm.

Animals↗
PubMed1996

Resonance of about-weekly human heart rate rhythm with solar activity change.

In several human adults, certain solar activity rhythms may influence an about 7-day rhythm in heart rate. When no about-weekly feature was found in the rate of change in sunspot area, a measure of solar activity, the double amplitude of a circadian heart rate rhythm, approximated by the fit of a 7-day cosine curve, was lower, as was heart rate corresponds to about-weekly features in solar activity and/or relates to a sunspot cycle.

Adult↗
PubMedDate not supplied

[Effect of solar activity on the physiological rhythms of biological systems].

The infradian components, including those with a period of about 3.5, 7, 30 days, are ubiquitously found in biology, from unicells to complex biological organisms. It can be hypothesized that heliogeophysical factors other than the solar visible light, likely at the origin of the circadian system (with a period of about 24 hours), may be responsible for the infradian biosystems.

Animals↗
PubMedDate not supplied

Cross-spectral coherence between geomagnetic disturbance and human cardiovascular variables at non-societal frequencies.

A 35-year-old cardiologist monitored himself with an automatic ABPM-630 (Colin Electronics) monitor, mostly at 15-minute intervals around-the-clock for three years with a few interruptions. In this subject with a family history of high blood pressure and stroke, a cross-spectral analysis revealed a statistically significant coherence at 27.7 days between systolic and diastolic blood pressure and heart rate vs. the geomagnetic disturbance index, Kp. A lesser peak in coherence was found for systolic blood pressure with Kp at a trial period of 4.16 days (P = 0.046). These results suggest that changes in geomagnetism may influence the human circulation, at least in the presence of familial cardiovascular disease risk, and they may do so at frequencies that have no precise human-made cyclic worldwide match.

Adult↗
PubMedDate not supplied

[Biological effects of planetary magnetic storms].

Six physiological parameters of cardio-vascular system of rabbits and ultrastructure of cardiomyocytes were investigated during two planetary geomagnetic storms. At the initial and main phase of the storm the normal circadian structure in each cardiovascular parameter was lost. The asynchronicity was growing together with the storm and abrupt drop of cardia activity was observed during the main phase of storm. The main phase of storm followed by the destruction and degradation of cardiomyocytes. Parameters of cardia activity became substantially synchronized and characterised by circadian rhythm structure while the amplitude of deviations was still significant at the recovery stage of geomagnetic storm.

Animals↗
PubMedDate not supplied

[Effect of interplanetary and geomagnetic disturbances on the increase in number of clinically serious medical pathologies (myocardial infarct and stroke)].

We determined with high accuracy the effect in intense geomagnetic storms on myocardial infarction an brain-stroke pathologies. We analysed the large set of data collected in Moscow from 1979 to 1981, we cleaned up the data by the first harmonic of the annual variation, and by the first three harmonics of the 7-day variations (7.0; 3.5; 2.3 days). We found that geomagnetic storms, producing large decreases in the cosmic ray intensity, increase the infarction rate by a factor 1.13 with a statistical confidence of 9 sigma and the brain stroke rate by a factor 1.07 with a statistical confidence of 4.5 sigma.

Cerebrovascular Disorders↗
PubMedDate not supplied

[Effect of heliogeophysical factors on the biological activity of Staphylococcus aureus].

In 1988-89, an experimental was carried out to study the effect of heliogeophysical factors on the biological activity of Staphylococcus aureus, one of the most widespread causative agents of infectious diseases in man and animals. For comparison, both individual heliogeophysical factors and interrelated phenomena in the system Sun-Earth arising from solar flashes were used. Two types of solar flashes were revealed. A near-annual cycle of changes in DNase activity of staphylococci in vitro was revealed, which correlates with the cycle of changes in electron concentration of layer F2 of the ionosphere. The correlation coefficient is 0,96%. It was found that the threshold of susceptibility of test-microorganisms to heliogeophysical influences is different in different years. There is an "amplitude window" of the influence whose upper boundary varies in different periods.

Deoxyribonucleases↗
PubMedDate not supplied

[Magnetic storms as a stress factor].

The functional characteristics variations during the magnetic storms were observed in both the healthy humans and in patients with cardio-vascular diseases as well as in cosmonauts at SOYUZ spacecraft and MIR station. These characteristics revealed a nonspecific adaptive stress reaction, which should be accompanied by the variations in the stress-hormone production rate. The neurohumoral regulation of the organism functions during the geomagnetic storms in a group of patients with cardio-vascular pathology and in a control group of healthy individuals were studied. The magnetic storm effect characterised of both the sick and healthy examines was the violated ratio of glucocorticoids and mineralocorticoids, namely increase of cortisone secretion (adrenal cortex hormone), as well as some tendency to the activation of sympathoadrenal system. Our investigations revealed also a suppressed production of melatonin (the pineal gland hormone) during the geomagnetic storm. These results are not in contradictions with the functional characteristics violation by the magnetic storms and correspond to the existence of adaptive stress reaction of the human organism to the geomagnetic field disturbances.

Adult↗
PubMedDate not supplied

[The origin of the biological week from data on the rhythm of cardiac contractions in people during the solar activity cycle].

A human biologic week in the heart rate variations was compared with the variations of the sunspot area and geomagnetic activity over the solar cycle. The low ratio of amplitude of circaseptan rhythm to that of circadian rhythm in the heart rate of several clinically healthy men who did around-the-clock self-measurements in a number of years coincides with the period of anomalously low amplitude of circaseptan rhythm of the solar activity. Results herein suggest that physiologic circaseptan rhythms are built into the genome being adapted evolutionary to the original heliogeomagnetic environmental circaseptans.

Adaptation, Physiological↗
PubMedDate not supplied

[Quasi-eleven year modulation of global and spectral features of geomagnetic disturbances].

Variations in spectral characteristics of the Kp-index of geomagnetic activity during the solar activity cycle were studied in order to assess the role of its rhythms in the formation of temporal structure of biological objects. It is shown that most spectral components of the Kp-index are modulated by the 10.5-year periodic rhythms in solar activity variations, while its circasemiseptan component (3.5 days) exhibits an 11-year rhythm. Since it is a circasemiseptan rhythm that is characteristics of biological objects (e.g., unicellular algae), it can be assumed that geophysical rhythms played a substantial role in the formation of biological rhythms during evolution.

Humans↗