AI Article Synopsis
- The study investigates how different frequencies of intradermal auricular electro-acupuncture stimulation (iaES) can impact the balance of the autonomic nervous system (ANS) in rats, focusing on heart rate variability (HRV) and heart rate (HR).
- Results show that 30 Hz iaES generally promotes vagal activity, increasing HRV and decreasing HR across various ANS imbalance states, while 100 Hz iaES has mixed effects, sometimes raising HR and lowering HRV.
- The findings suggest that both frequencies play distinct roles in rebalancing the ANS, with 30 Hz being beneficial in all states of imbalance and 100 Hz having specific inhibitory effects depending on the initial state of the
Article Abstract
Background: Vagus nerve stimulation (VNS) improves diseases such as refractory epilepsy and treatment-resistant depression, likely by rebalancing the autonomic nervous system (ANS). Intradermal auricular electro-acupuncture stimulation (iaES) produces similar effects. The aim of this study was to determine the effects of different iaES frequencies on the parasympathetic and sympathetic divisions in different states of ANS imbalance.
Methods: We measured heart rate variability (HRV) and heart rate (HR) of non-modeled (normal) rats with the treatment of various frequencies to determine the optimal iaES frequency. The optimized iaES frequency was then applied to ANS imbalance model rats to elucidate its effects.
Results: 30 Hz and 100 Hz iaES clearly affected HRV and HR in normal rats. 30 Hz iaES increased HRV, and decreased HR. 100 Hz iaES decreased HRV, and increased HR. In sympathetic excited state rats, 30 Hz iaES increased HRV. 100 Hz iaES increased HRV, and decreased HR. In parasympathetic excited state rats, 30 Hz and 100 Hz iaES decreased HRV. In sympathetic inhibited state rats, 30 Hz iaES decreased HRV, while 100 Hz iaES decreased HR. In parasympathetic inhibited rats, 30 Hz iaES decreased HR and 100 Hz iaES increased HRV.
Conclusion: 30 Hz and 100 Hz iaES contribute to ANS rebalance by increasing vagal and sympathetic activity with different amplifications. The 30 Hz iaES exhibited positive effects in all the imbalanced states. 100 Hz iaES suppressed the sympathetic arm in sympathetic excitation and sympathetic/parasympathetic inhibition and suppressed the vagal arm and promoted the sympathetic arm in parasympathetic excitation and normal states.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11153749 | PMC |
| http://dx.doi.org/10.3389/fnins.2024.1367266 | DOI Listing |
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- The findings suggest that both frequencies play distinct roles in rebalancing the ANS, with 30 Hz being beneficial in all states of imbalance and 100 Hz having specific inhibitory effects depending on the initial state of the
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