What Is the Difference Between a Resting and a Stress EKG?
A resting EKG and a stress EKG both measure the heart’s electrical activity, but they differ in when and how they are performed. A resting EKG is done while the patient is at rest - lying down comfortably with electrodes attached to the chest, arms, and legs. It records the heart’s rhythm, rate, and electrical conduction without any physical exertion. This test helps identify irregular heartbeats, signs of previous heart attacks, and other abnormalities that may occur even when the heart is not under stress. It is quick, non-invasive, and often used for routine evaluations, pre-surgical checks, or when symptoms such as chest pain or palpitations appear at rest.
A stress EKG, also known as an exercise EKG, monitors the heart while it is working harder, typically during treadmill walking or stationary cycling. As the heart rate increases, this test reveals how well the heart responds to physical exertion. It helps identify issues that may not appear on a resting EKG, such as reduced blood flow to the heart or exercise-induced arrhythmias. Stress EKGs are commonly used to evaluate chest discomfort during activity, detect coronary artery disease, and determine safe levels of physical activity for cardiac patients. By comparing both tests, doctors gain a more complete understanding of heart function under varying conditions.
