Silver Ice: This one is a mix between Squirt Soda and Fresca. This energy drink comes in 2 flavors Silver Ice and Punched Both flavors of Rockstar Pure Zero are pretty tasty and easy to drink. I recently picked up a few cans at 7-Eleven to give Rockstar Pure Zero a try.

Pure Zero is Rockstar's contender against Monster Energy's Absolutely Zero line and Red Bull's Total Zero. Pear-shaped vs.All flavors have the same caffeine content. However, they added, the results might be different with another energy drink or a larger group of volunteers.ДЇollow me on Twitter and вЂњlikeвЂќ Los Angeles Times Science & Health on Facebook. The increases in blood pressure and norepinephrine after consuming an energy drink may make people more vulnerable to cardiovascular problems, they wrote in a study published online Sunday by the Journal of the American Medical Assn. None of those stressors had a discernible effect.Д®ven so, the findings caused the researchers to fret. To see whether stressful situations would bolster the energy drinkвЂ™s effects, the researchers asked the volunteers to answer math questions, squeeze a hand grip or submerge a hand in ice water for two minutes. That compares with an increase from 139.9 to 178.6 pg/mL after finishing the placebo drink. After consuming the real energy drink, the average amount of norepinephrine rose from 149.8 to 249.8 picograms per milliliter of blood. The biggest difference was in blood levels of norepinephrine, a precursor of epinephrine (a.k.a. Those outcomes were essentially the same. By contrast, systolic blood pressure rose just 3% and diastolic blood pressure was flat after drinking the placebo beverage.Д«oth drinks led to a slight uptick in the heart rate вЂ“ an average of 3.1 additional beats per minute for Rockstar and 4.3 more for the placebo. After consuming Rockstar, their systolic blood pressure rose about 6%, from 108.4 millimeters of mercury to 115 mmHg, on average, and their diastolic blood pressure rose nearly 7%, from 64.3 mmHg to 68.5 mmHg, on average. The volunteers started out with heart rates and blood pressure readings in the normal range. Just like the volunteers, the researchers taking the measurements didnвЂ™t know who got the real energy drink and who got the placebo. All of those tests were repeated 30 minutes after their cans were emptied. Just before taking their first swig, the volunteers allowed researchers to measure their heart rate and blood pressure and to draw a sample of blood.

None of them were on medications, and none had consumed alcohol or caffeine in the 24 hours before each test. Their average age was 29 and their average body mass index was 25, right on the border between having a normal weight and being overweight. The 14 men and 11 women didnвЂ™t know which of the drinks they were getting on each day.ДЄll of the volunteers were in good health. On another day, the same volunteers swigged a вЂњplaceboвЂќ energy drink that had the same taste, texture and nutrients as Rockstar but none of the caffeine, taurine or other stimulants. See the most-read stories in Science this hour > A single can contained 240 milligrams of caffeine and 2,000 mg of taurine, along with guarana seed, ginseng root and milk thistle extracts. These discoveries were made with the help of 25 volunteers, each of whom who downed a 16-ounce can of Rockstar on an empty stomach in five minutes or less.

If you thought energy drinks were little more than sugar water, scientists from Mayo Clinic can assure you that they really do pack a punch.ДЄ team of cardiovascular researchers at the esteemed clinic in Rochester, Minn., reported that a single can of Rockstar energy drink can boost your blood pressure and cause the fight-or-flight hormone norepinephrine to increase in just 30 minutes.

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