System for detecting at least electrocardiographic signals

This system for detecting at least electrocardiographic signals showing cardiac activity is provided with a detection means for detecting electromyographic signals showing muscle activity in a human body and an extraction means for extracting at least electrocardiographic signals from the electromyographic signals. The detection means includes a first electromyographic sensor, and the first electromyographic sensor includes a pair of first measurement electrodes. The system is further provided with a mounting means for mounting the detection means on a user. The mounting means is configured so that the pair of first measurement electrodes contact a specific first portion of the user and are not disposed on the same muscular fiber present in the specific first portion when the detection means is mounted on the user.