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Developmental changes in heart rate variability during exposure to prolonged hypercapnia in piglets
Anthony L Sica1, David A Ruggiero, Ning Zhao
1Department of Physiology and Pharmacology, State University of New York, Downstate Medical Center, Brooklyn 11203, USA. asica@netmail.hscbklyn.edu
Autonomic Neuroscience : Basic & Clinical
|November 9, 2002
Summary
Heart rate variability (HRV) differences emerged in older piglets during hypercapnia, suggesting sympathetic and parasympathetic coactivation. Younger piglets showed stable HRV, indicating potential vulnerability during early maturation.
Area of Science:
- Physiology
- Developmental Biology
- Cardiovascular Research
Background:
- Heart rate variability (HRV) changes during maturation are not fully understood.
- Hypercapnia (elevated CO2) can impact autonomic nervous system function.
- Early life autonomic responses may influence long-term health outcomes.
Purpose of the Study:
- To investigate age-dependent effects of hypercapnia on heart rate variability (HRV) in developing piglets.
- To determine if hypercapnia induces changes in autonomic nervous system activity during early maturation.
- To identify potential windows of vulnerability in early postnatal development.
Main Methods:
- Developing porcine model with three age groups (5-8, 13-15, 26-34 days old).
- Animals were exposed to hypercapnia (10% CO2) or control (100% O2) conditions.
- HRV assessed using power spectral analysis, SD of RR intervals, and cardiac interval analysis.
Main Results:
- Significant HRV differences were observed only in the oldest group (26-34 days old) during hypercapnia.
- Older piglets exhibited cardiac interval distributions suggesting coactivation of sympathetic and parasympathetic systems.
- Younger piglets (5-8 days old) maintained balanced cardiac intervals, while 13-15 day olds showed a paucity of balanced intervals.
Conclusions:
- Autonomic nervous system responses to hypercapnia mature significantly by the fourth postnatal week in piglets.
- The period around the second postnatal week may represent a vulnerable stage with altered autonomic regulation.
- Understanding these developmental changes in autonomic control is crucial for assessing neuroprotection and health risks.