# Rules of Heliogeomagnetics Diversely Coordinating Biological Rhythms and Promoting Human Health
## 3 Results
### Circadian-Phase-Dependent Effect of Geomagnetic Stimulation on Circadian Amplitude of SBP and HR  
Among the 16 study participants who underwent ABPM for at least 2 days, 10 (Group A: five men and five women, 35 to 51 years of age) saw geomagnetic stimulation start late during the day, between 14:00 and 20:00 (Figure 4, left). The other six (Group B: three men and three women, 20 to 55 years of age) saw it start in the morning, between 06:00 and 12:00 (Figure 4, right). Since changes in the circadian characteristics of BP and HR in response to geomagnetic activity may depend on the circadian phase at which geomagnetic disturbances start to occur in addition to the severity of the magnetic disturbances, results were compared between Groups A and B, Table 4. This chronomodulatory effect of geomagnetic stimulation consists of an amplification by 49.2% of the circadian rhythm in SBP (\(p\) = 0.0003) when geomagnetic stimulation starts in the evening, Table 4 (left). The MESOR of DBP is also statistically significantly decreased. But a morning start of geomagnetic stimulation is associated with an amplification by 38.0% of the circadian rhythm in HR (\(p\) = 0.0596), Table 4 (right). The MESOR of SBP is also slightly but statistically significantly increased from 118.1 to 121.8 mmHg (\(p\) = 0.0285).  
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline  & & \multicolumn{4}{c}{**Group A (n = 10)**} & \multicolumn{4}{c}{**Group B (n = 6)**} \\  & \multicolumn{4}{c}{**(Geomagnetic Stimulation Started in the Evening: 14:00–20:00)**} & \multicolumn{4}{c}{**(Geomagnetic Stimulation Started in the Morning: 06:00-12:00)**} \\ \cline{2-13}  & & \multicolumn{2}{c}{**Quiet Day**} & \multicolumn{2}{c}{**Disturbed Day**} & \multicolumn{2}{c}{**Paired \(t\)-Test**} & \multicolumn{2}{c}{**Quiet Day**} & \multicolumn{2}{c}{**Disturbed Day**} & \multicolumn{2}{c}{**Paired T-Test**} \\ \cline{2-13}  & & **Mean** & **SD** & **Mean** & **SD** & **t-Value** & \(p\)**-Value** & **Mean** & **SD** & **Mean** & **SD** & **t-Value** & \(p\)**-Value** \\ \hline \multirow{4}{*}{\begin{tabular}{c} SBP \\ (mm Hg) \\ \end{tabular} } & M & 120.82 & 8.19 & 118.65 & 11.15 & \(-\)1.112 & 0.2951 & 118.09 & 12.59 & \begin{tabular}{c} 121.80 \\ (103.1\%) \\ \end{tabular} & 13.71 & 3.048 & 0.0285 \\ \cline{2-13}  & A & 13.48 & 4.79 & 20.11 & \multirow{2}{*}{4.12} & \multirow{2}{*}{5.683} & \multirow{2}{*}{0.0003} & \multirow{2}{*}{14.43} & \multirow{2}{*}{3.74} & \multirow{2}{*}{14.11} & \multirow{2}{*}{6.69} & \multirow{2}{*}{\(-\)0.100} & \multirow{2}{*}{0.9243} \\  & & & (149.2\%) & & & & & & & & \\ \cline{2-13}  & \(\Phi\) & 14:49 & 1:41 & 15.50 & 2:04 & 1.625 & 0.1385 & 15.39 & 1.28 & 16.54 & 2.25 & 1.177 & 0.2921 \\ \hline \multirow{4}{*}{\
\begin{tabular}{c} DBP \\ (mm Hg) \\ \end{tabular} } & M & 75.14 & 6.47 &
\begin{tabular}{c} 71.21 \\ (94.8\%) \\ \end{tabular} & 7.23 & \(-\)3.379 & 0.0081 & 72.39 & 7.47 & 73.58 & 3.84 & 0.657 & 0.5401 \\ \cline{2-13}  & A & 11.93 & 5.17 & 11.73 & 6.51 & \(-\)0.087 & 0.9329 & 10.21 & 4.36 & 8.68 & 4.75 & \(-\)0.467 & 0.6599 \\ \cline{2-13}  & \(\Phi\) & 15:13 & 1.57 & 16.05 & 1:48 & 1.336 & 0.2144 & 14.53 & 2.05 & 14.17 & 5.28 & \(-\)0.200 & 0.8495 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Changes in BP and HR characteristics depend on the circadian phase at which geomagnetic stimulation starts.  
Figure 4: Response of the circadian amplitude of SBP (**left**) and HR (**right**) to geomagnetic stimulation starting either in the evening (**left**) or in the morning (**right**). Chronomodulatory effects of geomagnetic stimulation on the circadian amplitude of SBP (**left**) and HR (**right**) exist in clinically healthy individuals. When geomagnetic disturbances start in the evening, the circadian amplitude of SBP is increased (\(p\) = 0.0003, Table 4 left); when they start in the morning, the circadian amplitude of HR is increased (\(p\) = 0.0596, Table 4 right).