The myocardium is working hardest when the heart is in diastole.

Name: The myocardium is working hardest when the heart is in diastole.
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The myocardium works hardest during systole, which is the contraction phase of the cardiac cycle. During systole, the myocardium contracts to eject blood from the heart into the arteries. In contrast, during diastole, which is the relaxation phase of the cardiac cycle, the myocardium is resting and preparing for the next contraction.

The Myocardium Is Working Hardest When the Heart Is in Diastole