A water and moisture sealed, self contained, compact, long term, ambulatory physio-kinetic monitor is designed for mounting directly to the skin of an athlete or fitness performer, preferably immediately adjacent to the organ or system that is to be monitored, and is adhesively held there in place, covertly and comfortably, under clothing by disposable electrode, adhesive skin pads. At least three positive electrodes and a common negative electrode extend from the monitor and attach by similar disposable adhesive electrode pads to detect physiological, e.g. ECG data. Accelerometer means disposed within the monitor detects body movement and likewise stores that data on a third ECG data channel.