manofredgables t1_ja52zg7 wrote
Reply to comment by Sea-Neighborhood729 in ELi5: How do those metal bits on the handles of cardio equipment measure your heart rate through your hands? by Sea-Neighborhood729
Electrical resistance. How much current you're conducting when exposed to the tiny voltage in the handles. It's a tiny current, but not too difficult to measure. Way below what you'd feel as an electrical shock.
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