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Cardiac rhythms in developing emu hatchlings.

K Moriya1, K Kato, M Matsumura

  • 1Department of Electrical and Electronic Engineering, Muroran Institute of Technology, 050-8585, Muroran, Japan.

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
|March 19, 2002
PubMed
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Emu hatchlings exhibit unique heart rate variability, including distinct accelerations and oscillations, unlike chick hatchlings. Their breathing rate is also slower, and they lack a clear circadian rhythm in their first week.

Area of Science:

  • Cardiovascular physiology
  • Avian biology
  • Comparative physiology

Background:

  • Understanding avian cardiovascular development is crucial for species conservation and biomedical research.
  • Previous studies have characterized heart rate patterns in chick hatchlings, providing a baseline for comparison.

Purpose of the Study:

  • To characterize the heart rate variability and developmental patterns in emu hatchlings during their first week of life.
  • To compare the electrocardiogram (ECG) and heart rate (HR) characteristics of emu hatchlings with those of chick hatchlings.

Main Methods:

  • Non-invasive electrocardiogram (ECG) recordings were obtained from six emu hatchlings using flexible chest wall electrodes.
  • Instantaneous heart rate (IHR) was determined from ECG data throughout the first week post-hatching.

Related Experiment Videos

  • Heart rate variability patterns (Types I, II, III, and unique accelerations) and mean heart rate (MHR) were analyzed.
  • Breathing frequency was estimated from respiratory sinus arrhythmia (RSA).
  • Circadian rhythmicity of MHR was assessed using visual inspection and power spectrum analysis.

    • Main Results:

    • Emu hatchlings displayed low baseline heart rates (100-200 bpm) with significant fluctuations and unique large accelerations.
    • Distinct heart rate oscillations (Type I: 0.37 Hz RSA, Type II: 0.06 Hz) were observed, with RSA suggesting slower breathing compared to chickens.
    • Unlike chick hatchlings, emu hatchlings did not exhibit a clear circadian rhythm in MHR during the first week.
    • Large, irregular heart rate accelerations were a characteristic finding in emu hatchlings.

    Conclusions:

    • Emu hatchlings possess a distinct cardiovascular profile characterized by significant heart rate variability and unique accelerations.
    • The respiratory sinus arrhythmia suggests a lower breathing frequency in emus compared to chickens, indicating developmental differences.
    • The absence of a clear circadian rhythm in early life may reflect unique thermoregulatory or developmental strategies in emu hatchlings.