system
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human
Are pacemakers able to adjust their "heart rate" based on the exertion of the person they belong to? Do they support a feedback system with the body?

I was thinking about this today, since someone's heart rate fluctuates even as they just stand up, do pacemakers have a way of dealing with such fluctuation? And if they can, to what extent can they support changes in heart rate? Could a pacemaker patient go for a run, or participate in extreme sport, for example?
gpt
Pacemakers generally regulate pacing at a lower boundary; this lower boundary is usually set by a cardiologist.

Pacemakers do not, however, regulate every heart beat. Aside from other contraindications there is no reason a pacemaker patient cannot run, exercise, or live a normal, healthy life. Their heart rate will increase, yes, but the medical device has nothing to do with this. It will only intervene when there is a missed beat or arryhtmia.

EDIT: This is not entirely accurate, particularly some different styles of pacemakers; there are pacers that will regulate maximum limits as well as constant heartbeat. Please see corrections in comments below.