scholarly journals Variations in propagation velocity of muscle-fiber action potentials in individual motor units during voluntary contractions

2011 ◽  
Vol 111 (3) ◽  
pp. 627-629 ◽  
Author(s):  
Dario Farina
Keyword(s):  
Muscle Fiber ◽  
Propagation Velocity ◽  
Action Potentials ◽  
Motor Units ◽  
Voluntary Contractions ◽  
Fiber Action ◽  
Individual Motor

Phase portraits of dystrophic and nondystrophic mouse muscle-fiber action potentials

1965 ◽  
Vol 208 (4) ◽  
pp. 724-731 ◽  
Author(s):  
Titus C. Evans ◽  
Byron A. Schottelius
Keyword(s):  
Muscle Fiber ◽  
Action Potentials ◽  
Sodium Ion ◽  
Phase Portraits ◽  
Dystrophic Muscle ◽  
General Increase ◽  
Ion Conductance ◽  
Mouse Muscle ◽  
Intracellular Action ◽  
Fiber Action

Intracellular action potentials from normal, control nondystrophic and dystrophic mouse soleus muscle fibers were recorded in both voltage-time and phase-portrait plots. Flattening of a normally curved portion in certain dystrophic muscle-fiber phase portraits suggested a greater than usual secondary entry of sodium ions after the peak of the action potential. Low-chloride studies excluded an abnormal chloride current as the cause of the flattening. It appears that inactivation of sodium ion conductance may be delayed or reduced, or both, in certain fibers of mice with hereditary muscular dystrophy. This is consistent with a general increase in membrane permeability. No definite negative afterpotential was noted in most mouse muscle-fiber action potentials.

The biphasic morphology of voluntary and spontaneous single muscle fiber action potentials

1994 ◽  
Vol 17 (11) ◽  
pp. 1301-1307 ◽  
Author(s):  
Daniel Dumitru ◽  
John C. King ◽  
William van der Rijt ◽  
Dick F. Stegeman
Keyword(s):  
Muscle Fiber ◽  
Action Potentials ◽  
Single Muscle ◽  
Single Muscle Fiber ◽  
Fiber Action

scholarly journals The bioelectrical source in computing single muscle fiber action potentials

1993 ◽  
Vol 64 (5) ◽  
pp. 1492-1498 ◽  
Author(s):  
B.K. van Veen ◽  
H. Wolters ◽  
W. Wallinga ◽  
W.L. Rutten ◽  
H.B. Boom
Keyword(s):  
Muscle Fiber ◽  
Action Potentials ◽  
Single Muscle ◽  
Single Muscle Fiber ◽  
Fiber Action

scholarly journals Motor control by precisely timed spike patterns

2017 ◽  
Vol 114 (5) ◽  
pp. 1171-1176 ◽  
Author(s):  
Kyle H. Srivastava ◽  
Caroline M. Holmes ◽  
Michiel Vellema ◽  
Andrea R. Pack ◽  
Coen P. H. Elemans ◽  
...  
Keyword(s):  
Brain Function ◽  
Action Potentials ◽  
Fundamental Problem ◽  
Motor Units ◽  
Spike Timing ◽  
Time Interval ◽  
Additional Information ◽  
Timing Drive ◽  
Spike Patterns ◽  
Individual Motor

A fundamental problem in neuroscience is understanding how sequences of action potentials (“spikes”) encode information about sensory signals and motor outputs. Although traditional theories assume that this information is conveyed by the total number of spikes fired within a specified time interval (spike rate), recent studies have shown that additional information is carried by the millisecond-scale timing patterns of action potentials (spike timing). However, it is unknown whether or how subtle differences in spike timing drive differences in perception or behavior, leaving it unclear whether the information in spike timing actually plays a role in brain function. By examining the activity of individual motor units (the muscle fibers innervated by a single motor neuron) and manipulating patterns of activation of these neurons, we provide both correlative and causal evidence that the nervous system uses millisecond-scale variations in the timing of spikes within multispike patterns to control a vertebrate behavior—namely, respiration in the Bengalese finch, a songbird. These findings suggest that a fundamental assumption of current theories of motor coding requires revision.

Conduction velocity of nerve and muscle fiber action potentials after a space mission or a bed rest

2003 ◽  
Vol 114 (1) ◽  
pp. 86-93 ◽  
Author(s):  
Dieter G. Ruegg ◽  
Tanja H. Kakebeeke ◽  
Jean-Pierre Gabriel ◽  
Monica Bennefeld
Keyword(s):  
Conduction Velocity ◽  
Muscle Fiber ◽  
Action Potentials ◽  
Bed Rest ◽  
Space Mission ◽  
Fiber Action

Frequency domain modeling of volume conduction of single muscle fiber action potentials

1988 ◽  
Vol 35 (5) ◽  
pp. 328-332 ◽  
Author(s):  
B.A. Albers ◽  
W.L.C. Rutten ◽  
W. Wallinga-De Jonge ◽  
H.B.K. Boom
Keyword(s):  
Frequency Domain ◽  
Muscle Fiber ◽  
Action Potentials ◽  
Single Muscle ◽  
Domain Modeling ◽  
Volume Conduction ◽  
Single Muscle Fiber ◽  
Fiber Action
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