system
Given the following post, respond as if you're commenting on Reddit:
human
When you exercise, does your heart beat harder or just faster? 

Your muscles need more oxygen so the heart pumps blood through the body at a greater flow rate. I know your heart **rate** goes up, but does your heart beat with the same.. effort (there's gotta be a better word)? Or is every beat the same? 

Edit: Thank you all for your answers and insight!
gpt
Both.  To effectively increase flow throughout the body, both rate & strength need to be increased.  Strength is simply how much your heart muscle is contracting... no different than any other muscle in the body.

However, it is possible to increase one without the other by targeting different cellular receptors.  We have different medications that work by increasing one or the other, or both, administered to heart failure patients.