Muscle injuries and dehydration can also trigger cramps. Dehydration is the excessive loss of fluids in the body. Low levels of any of the following minerals that contribute to healthy muscle function may also cause muscle cramps: calcium.
The heart is a part of the cardiovascular system in fact its the main part so if you have heart disease another way of saying this is you have cardiovascular disease.
The cardiovascular system serves five important functions (1) during exercise: 1  Delivers oxygen to working muscles. 2  Oxygenates blood by returning it to the lungs.  Transports heat (a by-product of activity) from the core to the skin.