Changes in voltage activation of contraction in frog skeletal muscle fibres as a result of sarcoplasmic reticulum Ca2+ -ATPase activity

1999 ◽  
Vol 166 (3) ◽  
pp. 209-216 ◽  
Author(s):  
Même ◽  
Léoty
Keyword(s):  
Skeletal Muscle ◽  
Sarcoplasmic Reticulum ◽  
Atpase Activity ◽  
Muscle Fibres ◽  
Frog Skeletal Muscle ◽  
Skeletal Muscle Fibres ◽  
Voltage Activation

Sarcoplasmic reticulum ATPase activity in type I and II skeletal muscle fibres of chronic heart failure patients

2009 ◽  
Vol 133 (2) ◽  
pp. 185-190 ◽  
Author(s):  
Martijn A. Bekedam ◽  
Brechje J. van Beek-Harmsen ◽  
Willem van Mechelen ◽  
Anco Boonstra ◽  
Frans C. Visser ◽  
...  
Keyword(s):  
Heart Failure ◽  
Skeletal Muscle ◽  
Chronic Heart Failure ◽  
Sarcoplasmic Reticulum ◽  
Atpase Activity ◽  
Muscle Fibres ◽  
Type I ◽  
Heart Failure Patients ◽  
Skeletal Muscle Fibres

Minimal latency of calcium release in frog twitch muscle fibres

1986 ◽  
Vol 229 (1254) ◽  
pp. 39-46 ◽  
Keyword(s):  
Skeletal Muscle ◽  
Sarcoplasmic Reticulum ◽  
Calcium Release ◽  
Arsenazo Iii ◽  
Muscle Fibres ◽  
Coupling Mechanism ◽  
Frog Skeletal Muscle ◽  
Intracellular Release ◽  
Skeletal Muscle Fibres

Intracellular release of calcium in frog skeletal muscle fibres was monitored by the use of arsenazo III, in response to voltage clamped depolarizing pulses. A latency of a few milliseconds was evident between the onset of depolarization and the first detectable rise in the arsenazocalcium signal, and this decreased logarithmically as the depolarization was increased. The minimal latency with strong depolarization (to +20 to +100 mV) was about 2 ms at 5 °C. This delay appears to be sufficiently long to be compatible with a chemically mediated coupling mechanism between depolarization and calcium release from the sarcoplasmic reticulum.

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