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To evaluate the acute effects of cocoa-rich chocolate consumption on the vascular function and cognitive performance of healthy young adults.A randomized study was conducted in 30 healthy participants aged 18 to 27 years. Half of the participants ingested a 20 g single dose of low cocoa chocolate (LCC:∼55%; 12,61 ± 1,35 mg equivalent of epichatequin/g) and the others ingested a single dose of 20 g of high cocoa chocolate (HCC:∼90%; 18,19 ± 2,64 mg equivalent of epichatequin/g). A baseline evaluation was performed after which the participants ingested the assigned chocolate, and two hours after a post-intervention evaluation was repeated. Each evaluation included heart ultrasonography, carotid-femoral pulse wave velocity (PWV) and carotid pulse wave analysis (PWA) with the Complior Analyse device, flow mediated slowing (FMS), cognitive testing and functional near-infra-red (fNIR) screening of the prefrontal cortex perfusion.The baseline evaluation presented similar values within normal range in both groups. Memory scores were similar in both groups. A positive vascular effect was depicted in both groups, but was more distinct in the HCC group. A statistically significant decrease of brachial and central systolic and pulse pressures were observed, with greatest effect size in the HCC group. A trend for improvement in the AiX and the FMS was observed in the HCC group only. Improvement in the memory scores (speed and accuracy) was observed in both groups, with a larger improvement in the HCC group, and related with an improvement in the pre-frontal cortex perfusion as assessed with the fNIR method. Dilation of the proximal segment of the right and left coronary arteries, assessed with transthoracic echocardiography (Parasternal short axis - aortic valve level) was also found, with greatest effect size in the HCC group.Acute intake of cocoa-rich chocolate improves vascular function and cognitive performance in healthy young adults, by reducing central brachial artery pressures, promoting vascular dilation, and improving brain perfusion over the prefrontal cortex.