accounting for the decreased amplitude of the compound muscle action potential while maintaining a normal nerve conduction velocity. The lack of change of the nerve conduction velocity would ...

Patients selected for the study had more than a 10% decrease of the compound muscle action potential amplitude (CMAPamp) from the first to the fourth response for both the deltoid and the APB muscles.

This provides a method of determining whether or not the previously reported muscle volume changes are a direct consequence of the action potential and are thus not connected with contraction as such.