منابع مشابه
Development of Heart Rate Circadian Rhythm in Chickens
In chick embryos, various instantaneous heart rate (IHR) fluctuations (e.g. HR variability, HR irregularities) have been found and developmental patterns of mean heart rate (MHR) have been elucidated. IHR changes have also measured in newly hatched and young chickens in order to investigate the developmental patterns of MHR and any potential diurnal HR rhythmicity such as a circadian rhythm. Th...
متن کاملHeart Rate Variability in Sleep Studies
NORMALIZED SPECTRAL BAND POWERS/VARIANCES ARE DERIVED MEASURES REFLECTING AUTONOMIC ACTIVITY, COMMONLY COMPUTED IN MANY HEART rate variability (HRV) data analysis software packages available to sleep researchers, particularly for the low-frequency (LF: often 0.04-0.15 Hz) and high-frequency (HF: often 0.15-0.40 Hz) spectral power/variance bands. The normalized (or normalized unit) spectral indi...
متن کاملHeart rate of chickens as influenced by age and gonadal hormones.
RINGER, ROBERT K., HAROLD S. WEISS AND PAUL D. STURKIE, Hewt rate 0-f chickens as in$uenced by age and gonadal hmnones, Am. J. Physiol. 191(I): 145-147. IgST.-The average heart rate of the chick increases from 286 beats/min. at I day to 475 at I week, with the greatest change occurring during the first 3 days. Heart rate continues to increase slowly to a maximum of approximately 500 beats at 3-...
متن کاملANG II and baroreflex control of heart rate in embryonic chickens (Gallus gallus domesticus).
ANG II alters the short-term blood pressure buffering capacity of the baroreflex in many adult animals. In embryonic chickens, high plasma ANG II levels contribute to baseline mean arterial pressure (MAP, kPa) without changing heart rate (ƒH, beats/min). We hypothesized, on the basis of these features, that an ANG II-induced reduction in baroreflex sensitivity is present in embryonic chickens a...
متن کاملContinuous measurements of instantaneous heart rate and its fluctuations before and after hatching in chickens.
There has been considerable interest in heart rate (fh) fluctuations in relation to cardiovascular control systems and foetal conditions during pregnancy in mammals. Prominent fluctuations in fh also occur in avian embryos, which are an important experimental model for studying developmental physiology. The present study determined the instantaneous fh of seven chick embryos continuously from t...
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ژورنال
عنوان ژورنال: Poultry Science
سال: 1971
ISSN: 0032-5791
DOI: 10.3382/ps.0500126