Chronaxies
Chronaxie is the tissue-excitability parameter that permits choice of the optimum stimulus pulse duration for stimulation of any excitable tissue. Chronaxie (c) is the Lapicque descriptor of the stimulus pulse duration for a current of twice rheobasic (b) strength, which is the threshold current for an infinitely long … See more Chronaxie is the minimum time required for an electric current double the strength of the rheobase to stimulate a muscle or a neuron. Rheobase is the lowest intensity with indefinite pulse duration which just stimulated muscles … See more The terms chronaxie and rheobase were first coined in Louis Lapicque’s famous paper on Définition expérimentale de l’excitabilité that was published in 1909. The above I(d) … See more The main value of chronaxie is comparing excitability across different experiments and measurements using the same standard, thus making data comparisons easier. Electrical stimulation based on chronaxie could regulate myoD gene expression in … See more • Bursting • Calcium channels • Epithelial sodium channel • Ion channels See more An electrode is inserted into the muscle of interest, which is then stimulated using surface current. Chronaxie values increase resulting from hyperventilation can be ascribed to a … See more Chronaxie is increased in the tetany of hypoparathyroidism. It must be remembered, however, that it is the rheobase which corresponds to the x.c.c. of electrical … See more Acute intoxication of rats with aldrin decreases chronaxie, whereas chronic exposure to this chlorinated hydrocarbon insecticide has the reverse effect. Chronic exposure of rats to the closely related epoxide, dieldrin, has been suggested to reduce their … See more Webn. pl. chro·nax·ies. The minimum interval of time necessary to electrically stimulate a muscle or nerve fiber, using twice the minimum current needed to elicit a threshold response. …
Chronaxies
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WebChronaxie values are dependent on the type and size of the neuronal elements where the action potential is initiated. Axon chronaxies are generally in the range of 30–200 μs for … WebJul 17, 2015 · The short chronaxies we obtained for the axons, on the order of 100 microseconds, are more characteristic of myelinated neurons, where a whole range of chronaxies has been observed, depending on the axon geometry and degree of myelination At the slowest extreme, the chronaxies are on the order of a millisecond, …
WebNov 26, 2024 · The nociceptive withdrawal reflex (NWR) is used to investigate nociception in horses. The NWR threshold is a classical model endpoint. The aims of this study were to determine NWR tolerance and to compare threshold and tolerance reflexes in horses. In 12 horses, the NWR was evoked through electrical stimulation of the digital nerve and … Webchro·nax·ie. also chro·nax·y (krō′năk′sē, krŏn′ăk′-) n. pl. chro·nax·ies. The minimum interval of time necessary to electrically stimulate a muscle or nerve fiber, using twice the minimum current needed to elicit a threshold response. [French : Greek khronos, time + Greek axiā, value (from axios, worthy; see ag- in Indo ...
Webchro·nax·ie ( krō'nak-sē ), A measurement of excitability of nervous or muscular tissue; the shortest duration of an effective electrical stimulus having a strength equal to twice the … WebLooking for chronaxies? Find out information about chronaxies. The time interval required to excite a tissue by an electric current of twice the galvanic threshold. McGraw-Hill Dictionary of Scientific & Technical... Explanation of chronaxies
WebThe chronaxie for orthodromic activation was similar to that for axonal activation, but was 40 times smaller than the chronaxie for direct cell body activation. This suggests that, …
WebOct 30, 2008 · A comparison of chronaxies for ventricular fibrillation induction, defibrillation, and cardiac stimulation: unexpected findings and their implications. Thomas Lawo Medical Clinic II (Cardiology), BG University Hospital Bergmannsheil, Bochum, Germany. can bpd be inheritedWebA comparison of chronaxies for ventricular fibrillation induction, defibrillation, and cardiac stimulation: unexpected findings and their implications It may be reasonable to study whether LEC pulses from 0.25 ms to 0.30 ms in duration and up to 250 V in amplitude would increase therapeutic yield in VT termination without VF induction in humans. can bpd be misdiagnosed as bipolarWeb1 : deviation from the typical embryological sequence of formation of organs and parts as a factor in evolution 2 : irregularity in time relationships specifically : the existence of differences in chronaxies among functionally related tissue elements heterochronous -ˈräk-rə-nəs adjective Dictionary Entries Near heterochrony heterochronism can bpd lead to schizophreniaWebElectro- cortical activity was recorded from screw electrodes in contact with the dura. Chronaxies were calculated from strength-duration data using the equation: chronaxie = … can bph affect blood pressureWebAug 1, 2006 · The chronaxie is related to the time constant of the directly stimulated membrane of a neuron ( Ranck 1975 ), which depends on a membrane's resistance and capacitance ( Bostock 1983; Bostock et al. 1983 ). EFFECTIVE CURRENT SPREAD USING BEHAVIORAL METHODS Spread properties can bpd be medicatedWebJan 1, 1985 · Rheobases, chronaxies and limit threshold charges were determined from experimental data. At implant, the strength-duration curve for the conventional electrode was under the strength-duration ... fishing lakes near tamworthWebThe chronaxie is the time it takes to activate a fiber when the amplitude is twice the rheobase. For two neurons with similar rheobases, the chronaxie gives a measure of the … fishing lakes near shrewsbury