Comment: This study shows that improvement occurs in as little as two weeks. (Longer term use increases the benefits.)
Taking daily supplements of fish or soy oil may improve cardiac function and protect against heart attacks in the short-term. Study results published in the April issue of CHEST, the peer-reviewed journal of the American College of Chest Physicians, are the first to show that soy oil increases heart rate variability (HRV), a measure of cardiac autonomic function.
Soy And Fish Oil May Help Prevent Heart Attacks