Human Physiological Parameters Related to Solar and Geomagnetic Disturbances: Data from Different Geographic Regions
Abstract
:1. Introduction
- (a)
- Studies on variations in human physiological parameters, such as heart rate and arterial systolic and diastolic blood pressure [2,3,4,5,6,7,8,9], as well as heart rate variability [10,11,12,13], etc. This category could also include research on the effects of space weather parameters on the central and autonomous nervous system through changes in the functional state of the human brain and psycho-emotional state [14,15,16];
- (b)
- (c)
- The Baku (Azerbaijan) study, in which the potential effects of environmental, physical activity changes (geomagnetic field disturbances and CRI variations through FDs) on the cardio-health state of functionally healthy humans [58] were examined;
- The Tbilisi (Georgia) project with results that concern mainly the influence that solar, geomagnetic, and CRI variations might have on the occurrence of cardiac arrhythmias. Importantly, the polarity reversal of the solar magnetic field seems to affect the correlation between the frequency of arrhythmias and the aforementioned variations [61];
- The Piraeus (Greece) project, which examined the possible relation of the number of sunspots Rz, solar flares, and coronal mass ejections, as well as the CRI on the number of patients with cardiac arrhythmia, especially on those with atrial fibrillation [62].
2. Data and Method
2.1. Cosmic Ray Data
2.2. Geomagnetic Activity Data
2.3. Solar Data
2.4. Statistical Methods
3. Results
3.1. The Baku Study
- (a)
- Geomagnetic activity
- −
- High levels of GMA for day 0 were related to an increase and decrease in the HR and RR interval physiological parameters, respectively. In fact, their maximum and minimum values were observed at levels III (30 ≤ Ap < 50) and IV (Ap ≥ 50) of the geomagnetic Ap index and at level III (Dst ≤ −50) of the geomagnetic Dst index, respectively.
- −
- The physiological parameters of HR and RR intervals varied significantly on the days before (−), during (0), and after (+) intense geomagnetic storms. In fact, these variations are more pronounced for levels III and IV of the GMA.
- −
- For level IV of the geomagnetic Ap index, the minimum values of the HR were recorded on days 0 and +1, while for the RR parameters on the same days, their maximum values were recorded.
- −
- For level IV of the geomagnetic Dst index, abrupt fluctuations were observed for both the HR and RR intervals, and on day 0, the minimum value for the HR and the maximum for the RR parameters were recorded.
- −
- As shown by the p-values regarding the effect of the GMA variations on the HR and RR parameters, the statistically significant results were mainly related to the days before the geomagnetic event.
- (b)
- Cosmic ray intensity variations
- −
- Strong decreases in CRI for day 0 were connected to an increase and decrease in the HR and RR interval physiological parameters, respectively. Their maximum and minimum values, respectively, were observed for decreases from −3% to −2%.
- −
- The HR and RR interval physiological parameters varied significantly on the days before (−), during (0), and after (+) CRI decreases. Furthermore, these variations were more intense with decreases of −3% and −4% in the CRI.
- −
- For strong CRI variations (decreases from −4% to −2%), the HR showed sharp fluctuations in the days before, during, and after these decreases. The RR parameters for the whole group showed similar behavior.
- −
- Specifically, for the strongest decreases in the CRI (−4%), on the day of the decrease, a minimum value was recorded for the HR and a maximum value for the RR parameters.
- −
- As can be seen from the p-values, the effect of the CRI variations on HR seems to be more significant in relation to the RR parameters.
3.2. The Kosice Study
- DP and SP in rest without load (DPR and SPR);
- DP and SP in the first degree of load (DPFDL and SPFDL—sitting on a stationary bike and pedaling at a power of 50–100 Watts);
- DP and SP in the second degree of load (DPSDL and SPSDL—sitting on a stationary bike and pedaling at a power of 100–150 Watts);
- Maximum DP and SP achieved by load (DPMAX and SPMAX—sitting on a stationary bike and pedaling at maximum power).
- Geomagnetic activity
- −
- High levels of GMA for day 0 are related to decreases in the physiological parameters of arterial SP and DP. Their minimum values were observed at levels III (−100 < Dst ≤ −50 and 30 ≤ Ap < 50) and IV (Dst ≤ −100 and Ap ≥ 50) of the geomagnetic indices Ap and Dst.
- −
- The physiological parameters of arterial SP and DP varied significantly on the days before (−), during (0), and after (+) intense geomagnetic storms. These changes were more pronounced for levels III and IV of the GMA.
- −
- For level IV of the GMA, there was a decrease in the values of the physiological parameters on the days before the intense events and then an increase on the days after the events. This behavior was present in the majority of the physiological parameters, except for cases where there were sharp fluctuations for different days, mainly for the DP parameter.
- −
- For level IV of the geomagnetic Ap index, the SP parameters (apart from SPMAX) show a minimum value one day before the geomagnetic storm (day −1), while the DP parameters (apart from DPR and DSDL) show a minimum value on day −3.
- −
- For level IV of the geomagnetic Dst index, the SP parameters show a minimum value either on day 0 (SPMAX and SPFDL) or on day −1 (SPR and SPSDL). The DPR, DPMAX, and DPSDL diastolic pressure parameters show minimums on days −1 and 0, respectively, while the DPFDL shows abrupt fluctuations.
- −
- As shown by the p-values, the Ap index levels seemed to have a greater effect on the SP (only in the SPMAX parameter on days 0 and +1). There are no statistically significant results for any of the DP parameters.
- −
- As can be seen from the p-values, the Dst levels statistically significantly affected the SP parameters (SPR, SPMAX, SPFDL, and SPSDL) and DP parameters (DPR, DPMAX, DPFDL, and DPSDL) on day +3 after the geomagnetic disturbance.
- Cosmic ray intensity variations
- −
- Strong decreases in the CRI (decreases from −16% to −6%) were connected to SP parameter decreases. The behavior of the DP parameters differed since their values increased from level −2 (decreases from −11% to −6%) to level −3 (decreases from −16% to −11%), where the maximum value was recorded.
- −
- The physiological parameters of arterial SP and DP varied significantly on the days before (−), during (0), and after (+) CRI decreases. Moreover, these variations were more pronounced for level −3 of the CRI variations.
- −
- For level −3 of the CRI variations, decreases in the physiological parameters on the days before the strong decreases in the CRI were observed, followed by an increase on the days after. This behavior was present in the majority of the physiological parameters, except for cases where there were sharp fluctuations on different days, mainly for the DP parameters.
- −
- For level −3, the SP parameter minimum values were observed on day 0 (except for SPMAX). The DP parameters recorded a minimum value two days before the decrease (day −2), except for DPR (day −1).
- −
- As can be seen from the p-values, CRI variations appear to have had a significant effect on the SP and DP parameters.
3.3. The Tbilisi Project
- Significant correlations were observed between ventricular extrasystolic arrhythmias (V1 and Vm) and the SPE and Dst index.
- V1 type of arrhythmias are also significantly correlated with the sunspot number, the number of solar flares, (with importance greater than M) and the CRI.
- Supraventricular arrhythmias (S and Ps) displayed significant correlation coefficients for different parameters. The highest correlation coefficients concerning S types of arrhythmias were observed for the number of solar flares with significance greater than with the M, SPE, and Dst index. The results for Ps types of arrhythmias are different. The highest correlation coefficients were observed for the number of C-type solar flares, CRI, and Ap index.
- The total number of arrhythmias shows a high correlation with the majority of the parameters, with the exception of the Bz component of the interplanetary magnetic field and the Ap index.
- This study also focused on the possible relation between the various types of arrhythmias and the polarity reversal of the solar magnetic field. As a result, the following occurred:
- The primary and secondary maxima observed in the solar parameters during solar cycle 22 also appeared in the V1, Vm, Ps, and all types of arrhythmias, with a time lag of about 5 months, which is consistent with the time lag of cosmic rays against the solar activity;
- Changes in the polarity sign of the solar magnetic field were found to affect the sign and value of the correlation between the frequency of arrhythmias and solar and geomagnetic variations, as well as CRI.
- Ventricular arrhythmias (V1 and Vm) appeared to be more sensitive to changes in the polarity sign of the solar magnetic field compared to supraventricular arrhythmias (S, Ps).
3.4. The Piraeus Project
- The medical cases and the sunspot number both increased during the rise phase of solar cycle 23 (1997–2001).
- There was an expected decrease in the sunspot number, while the number of medical cases continued to increase during the decay phase (2002–2009) and after the polarity reversal of the solar magnetic field (September 2000 until the end of 2002).
- The medical cases increased during the CRI decrease in the period of 1997–2001 and during the CRI increase (2002–2009).
- A good relation or anti-relation of the examined arrhythmia cases (and especially the AF cases) with the occurrence number of eruptive solar phenomena (solar flares and coronal mass ejections) was presented during the rise and the decay phases of solar cycle 23. This means that the polarity reversal of the solar magnetic field (during the maximum phase in each solar cycle) affected the correlation or anti-correlation.
- A good correlation or anti-correlation of the AF cases with solar activity, as expressed by the number of sunspots, solar flares, and coronal mass ejections, during the rise and decay phases of the solar cycle, was respectively revealed. Moreover, a good anti-correlation or correlation with the CRI during the rise or the decay phase of the solar cycle was respectively noticed.
- A possible relation between the increased arrhythmia cases and the arrival of energetic solar protons in the Earth’s environment, as well the increase in CRI, is indicated by the high correlation coefficient between the ARRY cases and the occurrence of solar proton events or the CRI during the rise phase.
4. Discussion and Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Mavromichalaki, H.; Papailiou, M.-C.; Gerontidou, M.; Dimitrova, S.; Kudela, K. Human Physiological Parameters Related to Solar and Geomagnetic Disturbances: Data from Different Geographic Regions. Atmosphere 2021, 12, 1613. https://doi.org/10.3390/atmos12121613
Mavromichalaki H, Papailiou M-C, Gerontidou M, Dimitrova S, Kudela K. Human Physiological Parameters Related to Solar and Geomagnetic Disturbances: Data from Different Geographic Regions. Atmosphere. 2021; 12(12):1613. https://doi.org/10.3390/atmos12121613
Chicago/Turabian StyleMavromichalaki, Helen, Maria-Christina Papailiou, Maria Gerontidou, Svetla Dimitrova, and Karel Kudela. 2021. "Human Physiological Parameters Related to Solar and Geomagnetic Disturbances: Data from Different Geographic Regions" Atmosphere 12, no. 12: 1613. https://doi.org/10.3390/atmos12121613
APA StyleMavromichalaki, H., Papailiou, M. -C., Gerontidou, M., Dimitrova, S., & Kudela, K. (2021). Human Physiological Parameters Related to Solar and Geomagnetic Disturbances: Data from Different Geographic Regions. Atmosphere, 12(12), 1613. https://doi.org/10.3390/atmos12121613