During endurance exercise the heart is forced to burn more glucose, which results in the buildup of lactic acid and hydrogen ions in the heart tissue. This buildup can damage the heart muscle and lead to scar tissue. The now-less-functional heart tissue in turn predisposes us to heart failure by weakening the heart’s ability to vortex water. This weakened state then leads to inadequate blood flow and increased pressure in the heart chambers, eventually contributing to heart failure.
