Level 3 Tesla bursts altering heart rate

I know for a fact that MRI bursts can alter heart rate. It happened to me last week actually. I could also feel the nodes in my armpit changing.
My heart rate became synchronized with the bursting. And I could feel a node in my back twitching/beating every time there was a burst.

Is this due to the Level 3 Tesla fields or the sound itself?

You can alter your heart rate merely by thinking about it, but anything shocking to the instincts can quickly reset the heart rate very high or very low.

I told the nurse that my heart rate is what I choose it to be. She didn’t believe me, so I demonstrated as she was trying to get a fix on my heart rate … swaying up … swaying back down … hesitating …

It felt like I couldn’t change it though. Like either the sounds or the magnets were making my heart exactly beating the same as their burst rate. And my mind felt like it was submitting to it.