Think now they have you on the tread mill just going faster, but not sure. They could tilt the treadmill so make it more like a slope.
It depends on the protocol, the main two are Balke and Bruce, Bruce is much more common.
For Bruce protocol both the speed and the incline are increased at regular intervals.
For Balke the speed initially increases to a brisk walking speed then just the incline is increased, again at regular intervals.
OP these machines beat everyone, there is no actual end, but the staff will not push you beyond you capabilities. The most boring tests are on marathon runners, they go on for ages, but the machine beats them in the end.
As you are fairly symptomatic they will be looking for changes to the ECG early on. If they induce AF or VT they will stop the treadmill and lie you down.
They will have all meds on hand to reverse that if it happens.
Badvoc
AF is treatable. Most people in their 70s have it and don't know.
It can be treated with medication, ablation or pace and ablate.
Ablation is a procedure where they track the individual activity throughout your atria and if they can find a pathway causing the AF they destroy it with radio waves or freezing.
Ablate and pace is when they can't find the source, or new sources start then they ablate parts of your body's natural conducting system and insert a pacemaker to take over.
If this happens you will need it checking and possibly reprogramming either every 6 months or every year, depending on the hospital.
OK now I've scared you, remember the first step is medication and for most people this is all you need.
AF is dangerous because the blood isn't being pumped effectively so it 'pools' in the atria and can cause small clots, if these get pumped to your coronary arteries they can cause a heart attack, if they get to the brain a stroke.
This is why people are normally given a beta blocker for the rhythm and an anticoagulant to stop clotting.
Good luck to anyone undergoing these tests.
Please remember not to call the clinical physiologists 'nurse'.