The RHYTHM of your heart pertains to how regular your heart beats. There are two heartbeat sounds,
“lub”(S1) and “dub”(S2), which should beat in a steady, consistent rhythm. The rhythm of your heart should show a specific work-to-rest ratio on the graph. Your heart should be resting twice as long as it is working. Observations are made to see if your heart is working too hard, or not working hard enough.