Since exercise causes the heart to function under intense internal pressure, or we can say it is in a state of being distended, the stroke volume of the heart will also increase, which will ultimately result in a stronger contraction.
This is simply in accordance with Stroke's rule, which states that if all other circumstances remain the same or unchanged, the volume of the heart's stroke increases if the blood in the ventricles increases prior to contraction. Large amounts of blood rushing into the ventricle stretch the heart's muscle fibers, increasing the contraction's force.
Significance:
This actually aids in synchronizing heart output with venous return, arterial blood flow, and humoral length.
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