Hi, as you had an angioplasty then you must be taking blood thinners and statins. Are you hypertensive? If yes then kindly consult your cardiologist to keep your BP under 130/80 If not then check you BP early in morning after 5 min of bed rest. Also check before and after your walk. If BP is above 140/90 when you walk then you might need some changes like low salt diet, gradual increase in walking and +/- anti hypertensive.