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.
Regular physical activity plays the biggest role in strengthening heart muscles -- and people who are inactive are twice as likely to suffer from heart disease as people who are physically active. Consult your doctor before making changes to your diet or exercise routine.