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Comparison between pre-prandial and post-prandial heart rate variability (HRV)
Vijayaraghava Ambarish1, Pradip Barde, Avni Vyas
1Department of Physiology, M. S. Ramaiah Medical College, Bangalore--560 054.
Indian Journal of Physiology and Pharmacology
|April 4, 2006
Summary
This study found no significant changes in autonomic tone after meals in healthy individuals, refuting the hypothesis that parasympathetic activity decreases post-meal. Heart Rate Variability (HRV) analysis showed stable cardiovascular autonomic tone following food ingestion.
Area of Science:
- Physiology
- Cardiovascular Health
- Autonomic Nervous System
Background:
- Food ingestion triggers gastrointestinal (GIT) peptide release, causing local vasodilation and blood redistribution.
- In healthy individuals, this physiological response is compensated, preventing post-prandial hypotension.
- The exact autonomic nervous system response to post-meal blood shifts remains an area of investigation.
Purpose of the Study:
- To investigate changes in autonomic tone after meals in normal individuals.
- To test the hypothesis of decreased parasympathetic activity post-meal.
- To utilize Heart Rate Variability (HRV) to assess autonomic function before and after lunch.
Main Methods:
- Continuous ECG recordings were taken from 15 healthy adults in pre-prandial and post-prandial states (15 min, 1 hr, 2 hr after lunch).
- Time and frequency domain measures of Heart Rate Variability (HRV) were analyzed using Nevrokard software.
- Autonomic tone parameters were compared between pre-prandial and post-prandial states.
Main Results:
- No significant changes were observed in time domain HRV measures (e.g., Range, SDNN, RMSSD, NN50, PNN50) between pre-prandial and post-prandial states.
- Frequency domain measures, including High Frequency (HF) representing parasympathetic activity, showed no significant alterations.
- Sympathetic indicators like Low Frequency (LF) and LF/HF ratio also remained statistically unchanged post-meal.
Conclusions:
- Parasympathetic tone does not significantly decrease after meals in normal individuals.
- Cardiovascular autonomic tone is not significantly affected by meal ingestion in healthy subjects.
- The study refutes the initial hypothesis regarding post-meal autonomic adjustments.
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