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.
Cardiovascular Exercise. Seniors should get 30 minutes of cardiovascular exercise that raises the heart rate each day. However, for seniors who don't have the mobility or endurance, exercising a few minutes several times a day is allowed.