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To closely examine magnesiumâs importance to the heart muscle, we have to pull out our microscopesâyes, it gets right down to the cellular and even the molecular level. Magnesium plays an essential role in many of the functions of energy production itself.It is an integral part of the energy (ATP) and protein (enzymes-as co-factor and as a structural component of the muscle protein, myosin) moleculesâwithout which the energy to contract and relax the heart does not occur properly.o closely examine magnesiumâs importance to the heart muscle, we have to pull out our microscopesâyes, it gets right down to the cellular and even the molecular level. Magnesium plays an essential role in many of the functions of energy production itself.
Magnesium also plays a role in the active transport of calcium and potassium ions across cell membranes, a process that is important to nerve impulse conduction, muscle contraction, and normal heart rhythm . An adult body contains approximately 25 g magnesium, with 50% to 60% present in the bones and most of the rest in soft tissues .