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ELI5: Long term effects of high blood pressure

Hi,

I have a question regarding the long term effects of high blood pressure in different situations. 

If, for instance, one has a resting blood pressure of  more than 140/90mmHg, this is considered elevated and should be a concern in the long term because of, amongst others, damaged bloodvessels.

Now, during sports or heavy physical (or stressful) activity (work for instance), I know that blood pressure can be a lot higher than 140/90mmHg.

How harmful, in that case, is a heavy physical job, or being a professional athlete with a lot of training every day. Should a high blood pressure for up to 8 hours per day followed by a lower blood pressure (time off) not be worse or just as bad as having a constant "lightly" elevated blood pressure of, for instance, 140/90mmHg?

Many thanks in advance!

&#x200B;
gpt
No matter how much training a person does, there are still periods of rest and recovery during that training. No one has an elevated blood pressure level for a solid 8 hours, no matter how much training they do. 

Another factor: training elevates your heart rate, making the heart stronger. Elevated blood pressure is usually due to less healthy factors, diet, stress, genetics.  When BP goes up during activity, it's to compensate for the additional needs of the body in action. If your body is trying to "run hot" while resting, something isn't working correctly.