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. 2011 Jul;138(1):117–130. doi: 10.1085/jgp.201010586

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© 2011 Clausen et al.

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Figure 8. — Effects of repeated stimulation on tetanic force in soleus muscles obtained from 12.5-wk-old WT and mutant mice. Muscles were mounted in force transducers for isometric contractions and stimulated at 120 Hz using 2-s trains of 0.2-ms 12-V pulses every minute. Each curve represents the mean of observations on four WT and eight mutant muscles, with error bars denoting SEM. During the initial contractions, the difference between tetanic force in WT and mutants was significant (P < 0.02). In the mutants, the last tetanic contraction was significantly larger than the first (P < 0.001).