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Topographic differences in SICF and LICF. (a) SICF and (b) LICF were calculated at the optimal IPI for FDI, APB, ECR, and BB muscles. Both measures were greatest in hand muscles. SICF was greatest in APB and FDI but was still significant in ECR and BB, whereas LICF was greatest in the FDI target muscle but not significant in ECR and BB. Results expressed as means ± SEM. *P < 0.05; **P < 0.01 (post hoc t-tests, significant difference from test MEP amplitude).
