Abstract: The invention relates to an electrode structure for measuring a biosignal from a living body, which electrode structure comprises a contact surface intended to be placed against the body. It is essential for the invention that the contact surface comprises several adjacent wave fronts, which wave fronts comprise protrusions and valleys, which are situated lower between the protrusions.

Abstract: The invention relates to a connecting arrangement between an electrode belt and a circumferential band at a heart rate monitor, the arrangement comprising the electrode belt for measuring heartbeat at a person's chest, which electrode belt comprises one or more electrodes and one or more sockets, provided with an opening and one or more supporting structures, the connecting arrangement further comprising the circumferential band provided with one or more connecting heads for keeping the electrode belt on the person's chest, the electrode belt and the circumferential band being connectable to each other by using one or more connections of the connecting arrangement, which connection can be provided by placing a connecting head in a socket.