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The effects of electrical stimulation frequency on force, work loop power output, and fatigue of mouse soleus muscle were investigated in vitro at 35 degrees C. Increasing stimulation frequency did not significantly affect maximal isometric tetanic stress (overall mean +/- SD, 205 +/- 16.6 kN.m-2 between 70 and 160 Hz) but did significantly increase the rate of force generation. The maximal net power output during work loops significantly increased with stimulation frequency: 18.2 +/- 3.7, 22.5 +/- 3.3, 26.8 +/- 3.7, and 28.6 +/- 3.4 W.kg(-1) at 70, 100, 130, and 160 Hz, respectively. The stimulation frequency that was used affected the pattern of fatigue observed during work loop studies. At stimulation frequencies of 100 and 130 Hz, there were periods of mean net negative work during the fatigue tests due to a slowing of relaxation rate. In contrast, mean net work remained positive throughout the fatigue test when stimulation frequencies of 70 and 160 Hz were used. The highest cumulative work during the fatigue test was performed at 70 and 160 Hz, followed by 130 Hz, then 100 Hz. Therefore, stimulation frequency affects power output and the pattern of fatigue in mouse soleus muscle.

Effect of stimulation frequency on force, net power output, and fatigue in mouse soleus muscle in vitro