It can help strengthen your muscles and body but at the same time you loose energy and can not continue for a long amount of time .
The muscles of the ventricles depolorize.
This is false!
For example, let's take the situation in which you are stressed when you are not prepared for an exam and you have to take the exam. You can plan better your time and start preparing earlier or try to "stage" practice exams for yourself and the result will be less stress!