| Electro-acupuncture stimulation to a hindpaw and a hind leg produces different reflex responses in sympathoadrenal medullary function in anesthetized rats. | |
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MedLine Citation:
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PMID: 10699639 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effects of electro-acupuncture stimulation (EAS) of two different areas of a hindlimb with different stimulus intensities on sympathoadrenal medullary functions were examined in anesthetized artificially ventilated rats. Two needles of 160 microm diameter and about 5 mm apart were inserted about 5 mm deep into a hindpaw (Chungyang, S42) or a hind leg (Tsusanli, S36) and current of various intensities passed to excite various afferent nerve fiber groups at a repetition rate of 20 Hz and pulse duration of 0.5 ms for 30-60 s. Fiber groups of afferent nerves stimulated in a hindlimb were monitored by recording evoked action potentials from the afferents innervating the areas stimulated. The sympathoadrenal medullary functions were monitored by recording adrenal sympathetic efferent nerve activity and secretion rates of catecholamines from the adrenal medulla. EAS of a hindpaw at a stimulus strength sufficient to excite the group III and IV somatic afferent fibers produced reflex increases in both adrenal sympathetic efferent nerve activity and the secretion rate of catecholamines. EAS of a hind leg at a stimulus strength sufficient to excite the group III and IV afferent fibers produced reflex responses of either increases or decreases in sympathoadrenal medullary functions. All responses of adrenal sympathetic efferent nerve activity were lost after cutting the afferent nerves ipsilateral to the stimulated areas, indicating that the responses are the reflexes whose afferents nerve pathway is composed of hindlimb somatic nerves. It is concluded that electro-acupuncture stimulation of a hindpaw causes an excitatory reflex, while that of a hind leg causes either excitatory or inhibitory reflex of sympathoadrenal medullary functions, even if both group III and IV somatic afferent fibers are stimulated. |
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Authors:
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H Mori; S Uchida; H Ohsawa; E Noguchi; T Kimura; K Nishijo |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of the autonomic nervous system Volume: 79 ISSN: 0165-1838 ISO Abbreviation: J. Auton. Nerv. Syst. Publication Date: 2000 Mar |
Date Detail:
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Created Date: 2000-04-18 Completed Date: 2000-04-18 Revised Date: 2003-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8003419 Medline TA: J Auton Nerv Syst Country: NETHERLANDS |
Other Details:
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Languages: eng Pagination: 93-8 Citation Subset: IM |
Affiliation:
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Department of Acupuncture, Tsukuba College of Technology, 4-12-7 Kasuga, Tsukuba, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Action Potentials
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physiology Adrenal Medulla / physiology* Afferent Pathways / physiology Animals Electroacupuncture / methods* Hindlimb* Male Nerve Fibers / physiology Rats Rats, Wistar Reflex / physiology* Sympathetic Nervous System / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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