@article{oai:muroran-it.repo.nii.ac.jp:00008306,
 author = {MORIYA, Kenji and 森谷, 健二 and HOCHEL,  Joachim and ヘーヒェル,  ヨアヒム and PEARSON, James and ピァーソン, ジェームズ and TAZAWA, Hiroshi and 田澤, 皓},
 journal = {室蘭工業大学紀要, Memoirs of the Muroran Institute of Technology},
 month = {Nov},
 note = {application/pdf, Chick instantaneous heart rate(IHR) was determined by electrocardiogram measured noninvasively from day of hatch to day 6. In experiment I, IHR was measured for 1-h periods twice a day, in daytime and at night, to investigate heart rate fluctuations (variability and irregularities). Chick IHR was substantially arrhythmic and spontaneous tachycardia of 100-150bpm dominated HR fluctuations. We categorized the fluctuations into three types; 1) type I as a widespread baseline HR (20 to 50bpm) due to respiratory arrhythmia, with a mean oscillatory frequency of 0.74Hz (range 0.4-1.2Hz); 2) type II as low frequency oscillations in HR baseline, at a mean of 0.07Hz (range 0.04-0.10Hz), of uncertain origin; and 3) type III as non-cyclic irregularities, dominated by frequent transient tachycardia. In experiment II, we determined the diurnal rhythms of chick IHR over 24-h periods and under conditions of a natural photoperiod, thermoneutrality and with feed available throughout the first week after hatching. Chick IHR was very variable in the daytime (250-500bpm), due in part to feeding and activity, and decreased to a diurnal low (200-350bpm) at night, when mean HR was stable. HR fluctuations persisted throughout the diurnal cycle., 特集 : 「動物の心拍リズム」国際シンポジウム発表論文選集},
 pages = {51--59},
 title = {Cardiac Rhythms in Developing Chicks},
 volume = {49},
 year = {1999},
 yomi = {モリヤ, ケンジ and タザワ, ヒロシ}
}