Increase in resting heart rate is a signal worth watching - Harvard Health Blog - Harvard Health Publishing
Heart Rate During Sleep: Look for These 3 Patterns - The Pulse Blog
Case study: I used my fitbit ionic to chart my first date heart rates... this is the best date versus the worst. As a meteorologist, I've really enjoyed looking at the patterns
Is a Slow Heart Rate Good or Bad for You? – Health Essentials from Cleveland Clinic
Why knowing your normal resting heart rate is important to your health - Insider