Reply: Evidence against volume conduction to explain normal MEPs in muscles with low motor power in SCI

We recently reported a case study of chronic spinal cord injury (SCI), in which motor evoked potentials (MEPs) with normal amplitude and latency could be recorded from the extensor carpi radials (ECR) muscle, even though the motor power of this muscle was just 1/5.¹

Calancie and Alexeeva² have hypothesized that volume conduction from the unaffected brachioradialis (BR) muscle explains this observation, and suggested that this could be tested by recording the surface electromyography (EMG) from both muscles during a resisted elbow flexion with the forearm in mid-pronation and wrist relaxed.

Log in or create a free account to read this content

Gain free access to this article, as well as selected content from this journal and more on nature.com

Access through your institution

or

Sign in or create an account

Continue with Google

Continue with ORCiD