Can a horse hear a human heartbeat from 4ft away?

There are a lot of memes that claim a horse can hear a human heartbeat from 4ft away and react to it. Here I look at the evidence that this may or may not be true.

[@Starcraftmisia]

can other people hear my heart beating loud? it feels so loud i feel people can hear it while im laying in bed, even if there in other rooms or on other floors

[@WudzYT]

Ask the people?!?!