<qa>  What is the focus of this study?This study is being done to look at the cardiovascular response, if any, to intake of commercially available energy drink. We hypothesize that energy drink consumption compared to a control drink in healthy adults alters the cardiovascular hemodynamic system.The focus of this study is to elucidate the physiologicalcardiovascular response to an energy drink consumption as compared to a control drink both at rest and during stressful conditions in healthy adults. 