The relation between scalp activity and cardiac automatic nervous system during a mental arithmetic(MA)task is explored with the power spectrum of electroencephalogram(EEG)and heart rate variability. The results show that heart rate increases(P<0.05)
total power reduces(P<0.05)
the normalized high frequency power component decreases(P<0.01)and the normalized low frequency power component increases(P<0.01)during MA task
so MA task weakens the cardiac sympathetic activity and enhances parasympathetic activity. And the average relative power in α rhythm of EEG decreases and the θ rhythm of EEG increases significantly(P<0.05). There are obvious correlations between θ rhythm of EEG for F8
FT8
C4
P4 and T8 channels and heart rate variability(P<0.05). It is noted that cerebral conscious activity increases and central decreases with parasympathetic activity decreasing and sympathetic activity increasing
and the pre-central
parietal lobe and temporal scalp influence heart rate by virtue of increasing sympathetic effects and decreasing parasympathetic effects
which plays an important role in cardiac autonomic regulation.
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references
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