Cell water, sodium, and potassium in stimulated red and white mammalian muscles

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Abstract
Potassium and sodium concentration and inulin space were measured in samples of rat soleus, plantaris, and gastrocnemius muscles after indirect stimulation in situ for 4 min, 30 min, and 6 hr. Two samples were taken from the gastrocnemius muscle: one from its outer layers, containing mostly white fibers, and another from the deep layer containing relatively more dark fibers. The cationic changes which follow low-frequency stimulation are largest in white gastrocnemius fibers, and decrease in this order: plantaris muscle, red gastrocnemius fibers, and soleus. When the stimulation frequency was increased, predominantly red components of the triceps surae also showed a marked cationic "debt." The same occurred with an intermittent tetanus alternating with stimulation at 10/sec. Intermittent tetanus alternating with resting periods or continuous tetanus did not cause any significant change in cationic distribution.

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