Washington: A study has found new evidence that the nitric oxide generated during physical exercise protects the heart from injury.Researchers at Emory University School of Medicine have identified the ability of the heart to produce and store nitric oxide as an important way in which exercise protects the heart from injury.Nitric oxide, a short-lived gas generated within the body, turns on chemical pathways that relax blood vessels to increase blood flow and activate survival pathways.
"Our study provides new evidence that nitric oxide generated during physical exercise is actually stored in the bloodstream and heart in the form of nitrite and nitrosothiols," Lefer said. "These more stable nitric oxide intermediates appear to be critical for the cardio protection against a subsequent heart attack," he stated.The researchers found that voluntary exercise boosted levels of an enzyme that produces nitric oxide (eNOS, endothelial nitric oxide synthase). Moreover, the levels of eNOS in heart tissue, and nitrite and nitrosothiols in the blood as well as heart tissue, stayed high for a week after exercise ceased, unlike other heart enzymes stimulated by exercise. The protective effects of exercise did not extend beyond four weeks after the exercise period was over, however, when nitrite and nitrosothiols in the heart returned to baseline.Another molecule that appears to be important for the benefits of exercise is the beta-3-adrenergic receptor, which allows cells to respond to the hormones epinephrine and norepinephrine. Additional animal studies are currently underway in Lefer``s lab to determine the potential benefit of beta-3-adrenergic receptor activating drugs following a heart attack.The findings have been published online in the journal Circulation Research. ANI
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