孵化期におけるニワトリ胚の心拍ゆらぎのスペクトル解析

概要

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In the present study, we aimed to investigate distinct heart rate fluctuations during final stage of chick embryo. Instantaneous heart rate was measured period from day-18 of incubation to hatching (about 21 days). Parameter α in the l/f^a spectra and frequency component (HF, LH/HF ratio) which were corresponding to parasympathetic nervous and sympathetic nervous activities were determined by sliding Fourier transform. The α in the spectra of hatched embryos tended to increase and the sympathetic nervous became predominance toward the end of the incubation. In contrast, the α in the spectra of un-hatching embryos tended to decreased and the parasympathetic nervous become predominant toward death. In future study, further measurements and analysis should be needed for the examination of distinct phenomena on the embryonic death and/or abnormal heart rate fluctuations.
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