Grasser, Erik Konrad Yepuri, Gayathri Dulloo, Abdul G. Montani, Jean-Pierre 2014-01-29 Purpose: Energy drinks are beverages containing vasoactive metabolites, usually a combination of caffeine, taurine, glucuronolactone and sugars. There are concerns about the safety of energy drinks with some countries banning their sales. We determined the acute effects of a popular energy drink, Red Bull, on cardiovascular and hemodynamic variables, cerebrovascular parameters and microvascular endothelial function.Methods: Twenty-five young non-obese and healthy subjects attended two experimental sessions on separate days according to a randomized crossover study design. During each session, primary measurements included beat-to-beat blood pressure measurements, impedance cardiography and transcranial Doppler measurements for at least 20 min baseline and for 2 h following the ingestion of either 355 mL of the energy drink or 355 mL of tap water; the endothelial function test was performed before and two hours after either drink.Results: Unlike the water control load, Red Bull consumption led to increases in both systolic and diastolic blood pressure (p < 0.005), associated with increased heart rate and cardiac output (p < 0.05), with no significant changes in total peripheral resistance and without diminished endothelial response to acetylcholine; consequently, double product (reflecting myocardial load) was increased (p < 0.005). Red Bull consumption also led to increases in cerebrovascular resistance and breathing frequency (p < 0.005), as well as to decreases in cerebral blood flow velocity (p < 0.005) and end-tidal carbon dioxide (p < 0.005).Conclusion: Our results show an overall negative hemodynamic profile in response to ingestion of the energy drink Red Bull, in particular an elevated blood pressure and double product and a lower cerebral blood flow velocity. application/pdf https://folia.unifr.ch/global/documents/303704 https://folia.unifr.ch/documents/303704/files/394_2014_Article_661.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1007/s00394-014-0661-8 info:eu-repo/semantics/openAccess License undefined European Journal of Nutrition. - 2014, p. 1–11 Energy drink Blood pressure Cerebral blood flow velocity Microvascular endothelial dysfunction Hemodynamics Risk factor info:eu-repo/classification/udc/613.2 Cardio- and cerebrovascular responses to the energy drink Red Bull in young adults: a randomized cross-over study http://purl.org/coar/resource_type/c_6501