Target Heart Rate and Cardio Monitoring for Safe Workouts

Maintaining a healthy resting heart rate is a key indicator of cardiovascular health, especially during high-intensity HIIT or IVF. Learn how to lower your heart rate while running and evaluate the accuracy of calories burned on heart rate monitors.

Heart Rate and Acetylcholine

Published Jul,08 2011 | By Christy Callahan

As one of the hardest-working muscles in the body, your heart beats thanks to a complex system of nerves, cells, biochemicals and minerals. Acetylcholine, a biochemical, plays a large role in maintaining your heart's rhythm when you are at rest.