The stress ECG is like a regular ECG with an additional standardized procedure of physical stress on the bicycle ergometer. The ECG records the data while you are cycling on a stationary bicycle. During the procedure the physical stress is successively increased up to a defined ending point. Often, lack of proper blood supply within the heart muscle can be traced only under physical stress, which makes the stress ECG the suitable method for determining an exact diagnostic. It is important to make the distinction between cardiac arrhythmias that occur during straining physical activity and the ones that occur during resting phases.