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Generally, the most basic formula for calculating the maximum heart rate that is considered safe is:
220 - your age.
Your heart rate will naturally increase to that level as a reaction to a lot of things: like exercise, blood pressure drops and adrenaline surges. It is called sinus tachycardia.
That's the short answer. If you want more info, the long answer is to come ;)
The formula has at least 50 variations, any of them can only give a rough estimate, based on age alone. There are many other factors to be considered alongside this. The most reliable method of finding the maximum heart rate is through a Cardiac Stress Test, which is basically just running on a treadmill while hooked up to an ECG and occasionally increasing the speed and slope. The real maximum heart rate depends on your age, size, weight, fitness and a little genetic randomness.
Here's the kicker though: there's a lot of different types of fast heart rate, which is medically referred to as "tachycardia". It's almost never fast heart beat that causes death; your body often increases it's heart rate as a reaction to some other kind of stimulus, but if it continues for a while then the heart's increased workload and demand for oxygen can cause ischemia. It can also degrade into become arrhythmic (irregular beat) if the underlying problem is not solved - arrhythmia will definitely kill you. Then of course, there is always the possibility of full blown cardiac arrest.
Hope this helped you
What else can I help you with?
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Running effects the body by making the hear rate rise through rapid respiration. While running the lungs must breath in and respire air quickly causing the heart to pump more blood quickly through the body.
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The more you exercise - the more oxygen your body's muscles need. In order for your heart to supply more oxygen - it must beat faster.
Why does your heart have to beat faster when exercising?
Exercising requires energy which requires oxygen to make. After the initial burst of energy is used up, not enough oxygen is being supplied to the heart so it then must work harder to pump blood. Therefore the lack of energy causes lack of oxygen causes heart to beat faster to compensate.
