regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion GO:0010881 Any process that modulates the frequency, rate or extent of cardiac muscle contraction via the regulation of the release of sequestered calcium ion by sarcoplasmic reticulum into cytosol. The sarcoplasmic reticulum is the endoplasmic reticulum of striated muscle, specialised for the sequestration of calcium ions that are released upon receipt of a signal relayed by the T tubules from the neuromuscular junction. biological_process regulation of cardiac muscle contraction by calcium ion signaling