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.

Fluctuating Heart Rate

Published Jul,08 2011 | By Nicole Adams

Your heart rate, or pulse, determines the strength of your heart. It is the number of times your heart beats per minute and it measures how hard your heart is working. A fluctuating heart rate is considered abnormal and could indicate an underlying issue.