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Representations of different body parts or muscles in the human primary motor cortex overlap extensively. At the effector level, most muscles are surrounded by and overlap with several neighbours as well. This hampers the assessment of excitability in individual muscles with transcranial magnetic stimulation (TMS), even if so-called “focal” stimulating coils are used. Here we used a novel mapping...
Objectives: To investigate the factors affecting the topography of trapezius muscle EMG, multichannel recordings were made at different forces of isometric shoulder elevation and during fatiguing exercise.Methods: Twenty-eight channels of monopolar EMG were recorded from an array of 4x7 electrodes placed on the upper trapezius muscle. From the monopolar EMG and the bipolar derivations the root mean...
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