Which test involves walking on a treadmill to assess the heart under stress?

• A. Digestive System
• B. Exercise tolerance test (ETT)
• C. Echocardiogram (Echo)
• D. Gallbladder

Answer: (B)

The test that uses walking on a treadmill to stress the heart is the exercise tolerance test. In this exam, the patient walks on a treadmill with the workload gradually increasing, while heart rate, blood pressure, rhythm, and symptoms are monitored with ECG. If the heart isn’t getting enough blood under stress, ischemic changes on the ECG or chest pain may appear, helping to detect coronary artery disease and assess functional capacity. This test is specifically about stress induced by exercise, not about imaging the heart at rest.

Other options don’t fit because they aren’t the treadmill-based stress test: a digestive system test or gallbladder imaging evaluate non-cardiac organs; an echocardiogram uses ultrasound to image heart structure and function (often at rest, though a stress echo variant exists).