Thanks for posting your query.
Tread meal test is a procedure by which status of coronary arteries can be detected.
With progressive increase in the speed, there is increased work load on heart and any significant amount of obstruction of coronary arteries can be detected.
ST segment depression
in II, III, aVF , V5 & V6 indicates ischemia
and obstruction in coronary arteries.
You should consult with cardiologist and should go for coronary angiography
& 2 D Echo.
If >70% obstruction is present in coronary arteries then you should go for angioplasty
This is to secure your life from future danger regarding heart ailment.
Dr. Mayank Bhargava