ECG Baseline Fluctuation and Gizzard EMG Activity in Chicks.

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  • TOYODA Futoshi
    Department of Animal Husbandry Resources, Faculty of Agriculture, Kyoto University
  • MORITA Tetsuo
    Department of Animal Science, Faculty of Agriculture, Miyazaki University
  • MIYAZAKI Akira
    Department of Animal Husbandry Resources, Faculty of Agriculture, Kyoto University
  • MITSUIYE Tamotsu
    Department of Physiology, Faculty of Medicine , Kyoto University

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  • 筋胃筋電図活動に起因するニワトリヒナ心電図ベースラインの変動

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Abstract

Chick electrocardiogram (ECG) was recorded using a pair of bipolar silver electrodes surgically fixed to the right clavicle and the sternal crest, and electromyogram (EMG) of the muscular stomach was recorded simultaneously using pair of bipolar electrodes implanted into thick caudodorsal muscle of the muscular stomach. The baseline of ECG, which was obtained by plotting maximum amplitudes of R-waves, synchronized with phasic activities of the gizzard EMG and its frequency ranged between 2.22 and 4.32 cycles/min. It was suggested that the chick ECG recordings implies electrical activities attributable to digestive apparatuses. Prolongation of the RR-interval occurred syn-chronized with apparitions of gizzard EMG activity suggesting a unique possibility that activities of heart and stomach are regulated by a common mechanism.

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