scholarly journals Effect of low cytoplasmic [ATP] on excitation-contraction coupling in fast-twitch muscle fibres of the rat

2004 ◽  
Vol 560 (2) ◽  
pp. 451-468 ◽  
Author(s):  
Travis L. Dutka ◽  
Graham D. Lamb
Keyword(s):  
Muscle Fibres ◽  
Excitation Contraction Coupling ◽  
Contraction Coupling ◽  
Fast Twitch Muscle ◽  
Fast Twitch

Recovery from immobilisation: responses of fast-twitch muscle fibres to spontaneous and intensive exercise in rat calf muscles

2004 ◽  
Vol 11 (1) ◽  
pp. 17-22 ◽  
Author(s):  
M Venojärvi ◽  
M Kvist ◽  
M Atalay ◽  
L Jozsa ◽  
H Kalimo
Keyword(s):  
Muscle Fibres ◽  
Intensive Exercise ◽  
Fast Twitch Muscle ◽  
Fast Twitch ◽  
Calf Muscles

Temperature Effects on Neuromuscular Transmission (Opener Muscle of Crayfish, Astacus Leptodactylus)

1981 ◽  
Vol 94 (1) ◽  
pp. 251-268
Author(s):  
LUDWIG FISCHER ◽  
ERNST FLOREY
Keyword(s):  
Decay Time ◽  
Neuromuscular Transmission ◽  
Membrane Conductance ◽  
Resting Potential ◽  
Muscle Fibres ◽  
Astacus Leptodactylus ◽  
Excitation Contraction Coupling ◽  
Contraction Coupling ◽  
Temperature Range ◽  
Parallel Change

In experiments on the opener muscle of the third walking legs of crayfish (Astacus leptodactylus) it was found that the mechanical tension developed in response to repetitive stimulation of the single motor axon increases over the entire temperature range from 30 down to 0°C. In contrast to this, the tension elicited by depolarizing single muscle fibres decreases with decreasing temperature; the threshold for excitation-contraction coupling is not significantly altered. With decreasing temperature the resting potential decreases (up to 2 mV/°C) but the amplitude and decay time of the e.p.s.p.'s increase. The time constant, λ, of e.p.s.p. decay has a Q10 of less than −2 in the range above 15 °C but reaches a value of −7 between 10 and 0°C. This pattern of temperature dependence is fully accounted for by a parallel change of membrane resistance and its reciprocal, the membrane conductance. The corresponding activation energies computed from λ-values approximate 3 kcal/mol at high temperature and 46 kcal/mol in the low temperature range. The combined effects of a lowered resting potential, an increased amplitude, and especially an increased decay time of e.p.s.p.s result in a drastic enhancement of the depolarization reached during summation of e.p.s.p.s as the temperature is decreased. These effects overcompensate the declining effectiveness of excitation-contraction coupling so that the entire process of neuromuscular transmission becomes more and more effective as the temperature declines. In order to reach the same tension lower frequencies of nerve stimulation are needed at lower temperatures.

Electromechanical Coupling II. The Effect of Perchlorate Upon Excitation-Contraction Coupling in Frog Skeletal Muscle Fibres

1982 ◽  
Vol 37 (7-8) ◽  
pp. 707-708
Author(s):  
Michael Gomolla ◽  
Gernot Gottschalk ◽  
Hans-Christoph Lüttgau
Keyword(s):  
Skeletal Muscle ◽  
Electromechanical Coupling ◽  
Muscle Fibres ◽  
Frog Skeletal Muscle ◽  
Large Shift ◽  
Excitation Contraction Coupling ◽  
Contraction Coupling ◽  
Inactivation Process ◽  
Skeletal Muscle Fibres ◽  
Kinetics Of

Abstract In single skeletal muscle Fibres perchlorate causes a large shift of the potential dependence of contraction activation to more negative potentials without a corresponding alteration in the kinetics of the inactivation process.

scholarly journals S-Glutathionylation of troponin I (fast) increases contractile apparatus Ca2+sensitivity in fast-twitch muscle fibres of rats and humans

2012 ◽  
Vol 590 (6) ◽  
pp. 1443-1463 ◽  
Author(s):  
J. P. Mollica ◽  
T. L. Dutka ◽  
T. L. Merry ◽  
C. R. Lamboley ◽  
G. K. McConell ◽  
...  
Keyword(s):  
Troponin I ◽  
Muscle Fibres ◽  
Contractile Apparatus ◽  
Fast Twitch Muscle ◽  
Fast Twitch
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