Does mastrubation cause a permanent high heart rate?

No. Like any form of physical exertion it is expected to raise the heart rate during the event. The heart rate would then subside afterwards. Anyone saying it is permanent is perpetuating a myth. Such myths are spread by those who want to shame the practice.

No. During masturbation the rate will go up and come down after the act is finished

Anytime you are excited and stressed as well as playing sports, you heart rate will go up. After masturbating and the thrill is over than your heart rate will come down.

No. Masturbation is a normal, harmless activity. It will not cause, acne, memory loss, weakness or any other illness. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV, Flu and Covid vaccines. Wish you good health!