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. 2007 Apr 18;78(11):1202–1208. doi: 10.1136/jnnp.2006.112078

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Figure 6 (A) Group data for 16 patients with amyotrophic lateral sclerosis (ALS) and 25 controls showing a reduction in the compound muscle action potential (CMAP) amplitude generated by a submaximal stimulus. (B) Changes in CMAP amplitude for a fixed supramaximal stimulus revealed a reduction in CMAP amplitude after maximum voluntary contraction.