EMG electrode apparatus and positioning system

A method comprising:

• a) monitoring electrical signals from a plurality of electrically conductive electrodes in operative connection with a substrate while the electrodes remain in electrical communication with a patient and the patient moves causing the substrate to increase in length in at least one dimension, wherein the substrate includes a plurality of rows of perforations therethrough, wherein each row includes a plurality of the perforations, wherein in each row the perforations are spaced apart and substantially longitudinally aligned, wherein the substrate increases in length by spreading apart portions of the substrate on opposed sides of at least one perforation;
• b) through operation of at least one computer, evaluating at least one medical condition with respect to the patient responsive to at least a portion of the electrical signals monitored in (a).

A method of monitoring and evaluating electrical signals in a back of a patient using a plurality of electrically conductive electrodes mounted to the back of the patient, wherein the electrodes are mounted to a substrate, wherein the substrate includes a plurality of rows of perforations therethrough, wherein each row includes a plurality of the perforations, wherein in each row the perforations are spaced apart and substantially longitudinally aligned, wherein the method comprises:

• a) monitoring electrical signals associated with each of the plurality of electrically conductive electrodes with the patient in different positions that cause the portions of the substrate on opposed sides of at least one perforation to spread apart;
• b) through operation of at least one computer, evaluating at least one medical condition with respect to the patient responsive to at least a portion of the electrical signals monitored in (a).