During
exercise, Amanda’s heart rate has nearly doubled from her resting heart rate
because her heart would be beating much faster, allowing more blood flow out of
her heart at a faster and frequent rate, resulting to increase cardiac output
and stroke volume. Therefore, cardiac output is the product of the heart rate
and stroke volume.
That is something that cant be explained you will have to go to a doctor or a medical person or physician for that . or try avoid using a cold shower take a hot shower
