Don't look to your wrist for accurate heart rate monitoring, study says
Are wristwatch-style heart rate monitors accurate? - Harvard Health
Just How Accurate Is Your Wrist-Based Heart Rate Monitor?
How accurate are the wrist-based heart rate monitors during walking and running activities? Are they accurate enough? | BMJ Open Sport & Exercise Medicine
Can You Trust a Wristband Heart Rate Monitor's Accuracy?
Heart Rate Monitors: Wrist-Based vs Chest Straps
How to get more accurate wrist heart rate readings on your Suunto watch