回転刺激をうけた孵卵後期のニワトリ胚における心拍ゆらぎ解析

概要

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The purpose of this research is to investigate heart rate (HR) fluctuations during the last-half of incubation on chick embryos exposed to the rotation stimulus. During incubate day and day 12, the eggs were in the incubator that inside temperature was 38 degree centigrade and relative humidity was 60%. From day 13 to day 21, the embryos were exposed to rotation stimulus of which velocity was 5 rpm for an hour (group I) or two hours (group II) everyday. Afterward, HR was measured under the incubate environment. The indices of the autonomic nervous activity were investigated by the power spectrum analysis of HR fluctuations. In case of group I, after the rotation stimulus had stopped, HR tended to decrease during less than 10 min, subsequently HR tended to increase up. In case of group II, HR tended to decrease and baseline kept the low level. And pars symphysica of group II, the day 18 was three times bigger than before. These results between group I and II could be considered that too strong rotation stimulus had a baneful influence on the HR and autonomic nervous activities. In the further research, we have to investigate HR fluctuations and autonomic nervous activities during the rotation stimulus.
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