Understanding Heart Rate Variability for Strength Training
Lub-dub. Lub-dub. Lub-dub. That’s the rhythmic sound your heart is (hopefully) making during the approximately 100,000 times it beats per day. Many people think the heart beats at a regular tempo like a metronome, but the reality is quite different. The time between each beat, known as the interbeat interval of the heart, is fluid, […]