Patent ID: 8190230

Claim:
A protective electrode structure for a portable user-specific performance monitor system including skin electrodes for a physiological measurement, the protective electrode structure comprising: an insulator; an outer protective electrode; at least one middle protective electrode configured to protect the skin electrodes against electrical interference and to be placed between the outer protective electrode and the skin electrodes during a measurement, the outer protective electrode protecting the skin electrodes against electrical interference, the at least one middle protective electrode and the outer protective electrode being insulated from each other by the insulator, the at least one middle protective electrode being configured to be coupled to a virtual ground of the user-specific performance monitor system; and at least two additional protective electrodes configured to balance electrical interference on the skin electrodes and to be placed between the at least one middle protective electrode and the skin electrodes, the additional protective electrodes being configured to be insulated from the at least one middle protective electrode and cross coupled to the skin electrodes.