How to stop vibration after alert of unusual heart rate

I want to keep the alert for unusually high heart rate enabled, but I cannot figure out how to make it stop vibrating once it has alerted me. If often happens in meetings or in other settings where it is very impractical for it to continue vibrating after I have noted the fact that my heart rate is high. I have tried pressing both the top and bottom button on the side, and I have tried holding them in, but it continues vibrating. It creates more stress for me to not be able to get it off without taking the watch off my wrist. 

What should I do?