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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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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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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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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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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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Membrane Potential Dependent Duration of Action Potentials in Cultured Rat Hippocampal Neurons
Cellular and Molecular Neurobiology, 2007(1) Fluctuations of the membrane potential states are essential for the brain functions from the response of individual neurons to the cognitive function of the brain. It has been reported in slice preparations that the action potential duration is dependent on the membrane potential states.
Bo, Gong, Mingna, Liu, Zhi, Qi
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Cardiac action potential duration and calcium regulation in males and females
Biochemical and Biophysical Research Communications, 2009Adult women have longer QT intervals compared with men of a similar age, indicating differences in the speed of repolarisation of the ventricles. We investigate the influences of gender on ventricular electrophysiology and intracellular Ca(2+) regulation of the guinea pig heart.
Sammy A, Mason, Kenneth T, MacLeod
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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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