Slow hearts?

My subject is too long but I was wondering if it's possible to slow someones heart or lower or raise their blood pressure, I'm genuinely curious about this because in theory isn't it like manipulating someones energy but with actual cells?

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It has been demonstrated by *healthy* people that some meditative states can be used to alter some basic functions such as slowing the heart beat, altering body temperature, et cetera. If this is for health purposes, it is better to discuss meditation options with a medical professional, as meditation does help lower stress levels and calm both mind and body. However, I am just some random person online, and so by no means should my post be taken as medical advice.