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.
A study published in a 2012 issue of the Journal of Strength and Conditioning Research confirmed through electromyographical analysis that the gluteus maximus, and the smaller side hip muscle of the gluteus medius, are highly stimulated during the step up.