More on the ongoing beet juice conundrum. A new study published in the  American Journal of Physiology-Regulatory, Integrative and Comparative Physiology finds that men who drank beet juice for 15 days had lower blood pressure and more dilated blood vessels at rest and during exercise. Science Daily reports that beet juice appeared to help blood vessels dilate more easily and allow the heart to consume less oxygen during exercise. The bottom line: The researchers are convinced that beet juice can enhance oxygen delivery to the muscles and reduce the work the heart does during exercise, allowing us to, yes, exercise longer. If we want to.