Assessments of autonomic nervous system activity of the fetus andthe prenatal education by fetal magnetocardiography.

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The value of CV_<RR> in the normal pregnancy group displayed a slight increasing trend with gestational age. However, no such trend was observed in the FGR group. In contrast, the LF/HF ratio in the normal pregnancy group clearly increased over the gestational period. The LF/HF ratio in the FGR group also displayed an increasing trend over the gestational period. The development of fetal ANS activity in FGR cases might differ from that observed in the normal pregnancy group. With regard to fetal autonomic nervous system activity, there was a pronounced increase in sympathetic nervous activity among fetuses with normal growth in the second half of pregnancy. LH/HF ratio of fetuses and mothers both decreased by the music relaxations.