Results 291 to 300 of about 12,692,953 (333)
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Modulation of action potential duration on myocyte hypertrophic pathways
Journal of Molecular and Cellular Cardiology, 2006Prolongation of the action potential duration (APD) has consistently been observed in experimental models of cardiac hypertrophy and failure as well as in humans and is partially attributed to a reduction of a hyperpolarizing current provided by the calcium-independent transient outward K(+) channel (I(to)).
Djamel, Lebeche +2 more
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Mean Duration of Action Potentials in Extraocular Muscles
Archives of Ophthalmology, 1960Electromyography of skeletal muscles has been in use for over 20 years and has proven to be a valuable diagnostic procedure. In analyzing the parameters of the electromyogram (EMG), Buchthal 1 has pointed out the importance of the mean duration of the muscle action potential (the mean of the duration of 20 different action potentials), noting that the ...
I, GAMSTORP, C, KUPFER
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Motor unit action potential components and physiologic duration
Muscle & Nerve, 1999Motor unit action potentials (MUAPs) recorded from the same motor unit at two distances along the biceps brachii muscle with monopolar needle electrodes at high amplifier gains (20 microV/division) and averaged 2000-3000 times reveal total potential durations of 39.6 +/- 4.6 ms.
D, Dumitru, J C, King, W E, Rogers
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Duration, amplitude, and shape of muscle action potentials in poliomyelitis
Electroencephalography and Clinical Neurophysiology, 1951Abstract Durations, amplitudes and shapes of action potentials have been studied in paretic muscles of 48 cases of poliomyelitis which were partly followed from the acute stage of the disease in repeated examinations up to one year after the onset of paresis.
P, PINELLI, F, BUCHTHAL
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Shaping synaptic learning by the duration of the postsynaptic action potential
The 2013 International Joint Conference on Neural Networks (IJCNN), 2013Most previous studies treated spikes as all-or-none events, and considered their duration and magnitude as negligible. Action potential (AP) duration varies across neuron types, but its consequences on synaptic plasticity remain largely unexplored.
Youwei Zheng, Lars Schwabe
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Arrhythmogenic Consequences of Action Potential Duration Gradients in the Atria
Canadian Journal of Cardiology, 2011Atrial action potential duration (APD) has been shown to decrease with increasing distance from the sinoatrial node in several species, including humans. This gradient has been postulated to be cardioprotective by reducing repolarization gradients.This study tests the effect of the APD gradient on reentry initiation and characteristics.This study used ...
Marc-Etienne, Ridler +4 more
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Physiological Measurement, 1993
Measurement of action potential duration is made more valuable if it can be made simultaneously with other variables, to which it may be related. We have developed a microcomputer-based system which allows measurement of action potential duration, both for transmembrane action potentials and for monophasic action potentials.
D S, Coulshed +4 more
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Measurement of action potential duration is made more valuable if it can be made simultaneously with other variables, to which it may be related. We have developed a microcomputer-based system which allows measurement of action potential duration, both for transmembrane action potentials and for monophasic action potentials.
D S, Coulshed +4 more
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Pfl�gers Archiv European Journal of Physiology, 1971
1. The experiments were done on single superfused nodes of Ranvier of frog motor fibres (Rana esculenta) with the double air gap method. The node was stimulated at a rate of 80 impulses/sec and the maximum rate of rise (\(\dot V_A \)) and the duration (D) of the action potentials were recorded. 2.
J, Vierhaus, W, Ulbricht
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1. The experiments were done on single superfused nodes of Ranvier of frog motor fibres (Rana esculenta) with the double air gap method. The node was stimulated at a rate of 80 impulses/sec and the maximum rate of rise (\(\dot V_A \)) and the duration (D) of the action potentials were recorded. 2.
J, Vierhaus, W, Ulbricht
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Action Potential Duration, Rate of Stimulation, and Intracellular Sodium
Journal of Cardiovascular Electrophysiology, 2006In the first section of this short review the change of the cardiac action potential (APD) with the rate of stimulation under physiological conditions is described and mechanistically analyzed. A fast phase of adaptation is mainly caused by changes in gating characteristics of ionic currents, and rapid modulation of the Na+/Ca2+ exchanger.
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Computer analysis of prolongation of cardiac action potential duration
Computers and Biomedical Research, 1983Using Beeler and Reuter's mathematical model of action potential in myocardial fibers, a similar extent of prolongation of action potential duration at -60 mV (APD -60) was produced at the infinite interval of stimulation by altering parameter values for slow inward current (is) time-independent (ik1) and time-dependent (ix1) outward currents.
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