Effect of pH on muscle fatigue in isolated frog sartorius muscle

1980 ◽  
Vol 58 (5) ◽  
pp. 568-570 ◽  
Author(s):  
E. Don Stevens
Keyword(s):  
Muscle Fatigue ◽  
Phosphate Buffer ◽  
Ringer Solution ◽  
Sartorius Muscle ◽  
Effect Of Ph ◽  
Frog Sartorius Muscle ◽  
Frog Sartorius

Isolated frog sartorius muscle was incubated for 3 h in Ringer solution (5 mM phosphate buffer) at pH 7 or pH 8. Each muscle was stimulated supramaximally at 2 per second continuously. Muscles at pH 7 fatigued more quickly than those at pH 8. Muscles at pH 8 released acid whereas those at pH 7 did not.

scholarly journals A Study on the Electrical Resistance of the Frog Sartorius Muscle

1966 ◽  
Vol 49 (5) ◽  
pp. 897-912 ◽  
Author(s):  
Otto Schanne ◽  
Hiroshi Kawata ◽  
Bärbel Schäfer ◽  
Marc Lavallée
Keyword(s):  
Muscle Fiber ◽  
Potassium Concentration ◽  
Membrane Resistance ◽  
Ringer Solution ◽  
Effective Resistance ◽  
Sartorius Muscle ◽  
Cable Model ◽  
Frog Sartorius Muscle ◽  
Electrode Resistance ◽  
Frog Sartorius

Four different methods of measuring the resistance of a muscle fiber have been applied to the frog sartorius muscle. The methods, in which the resistance of the microelectrode entered the calculation of the effective resistance of the fiber, resulted in values which were 8 times higher than the resistance values obtained with methods independent of the electrode resistance. A simple cable model of a muscle fiber could not account for the discrepancy in the effective resistance found in these measurements; therefore, an enlarged cable model for a muscle fiber has been proposed, and its biological implications have been discussed. The effective resistance (measured with the two different groups of methods) decreased when the potassium concentration in the bath increased. Using the proposed enlarged cable model for the interpretation of these results, it is shown that not only the membrane resistance but also the myoplasmic resistance decreases with an increasing potassium concentration in the Ringer solution.

Constancy of Axial Spacings in Frog Sartorius Muscle during Contraction

Nature ◽  
1965 ◽  
Vol 206 (4991) ◽  
pp. 1358-1358 ◽  
Author(s):  
H. E. HUXLEY ◽  
W. BROWN ◽  
K. C. HOLMES
Keyword(s):  
Sartorius Muscle ◽  
Frog Sartorius Muscle ◽  
Frog Sartorius
Sign in / Sign up

Export Citation Format

Share Document