Tasneem Naqvi and Hahn Hyuhn from the University of Southern California and Cedars-Sinai Medical Center evaluated carotid artery reactivity and brain blood flow in response to mental stress in 10 healthy young volunteers (aged between 19 and 27 years), 20 older healthy volunteers (aged 38 to 60 years) and in 28 patients with essential hypertension (aged 38 to 64 years).
They found that in healthy subjects, mental stress caused vasodilation. This was accompanied by a net increase in brain blood flow. In hypertensive subjects, mental stress produced no vasodilation and no significant change in brain blood flow.
During the experiments, the volunteers were set a series of tasks designed to provoke mental stress, including reading, arithmetic and anger recall tests. The researchers used ultrasound imaging to measure the effects of this activity on the carotid artery and an artery within the brain, while also measuring blood pressure and heart rate.
According to Naqvi, "Inappropriate vasoconstriction, or lack of dilation in response to mental stress in stable coronary heart disease, contributes to the genesis of myocardial ischemia and confers an increased risk in patients with coronary artery disease. It will be interesting to see whether the lack of mental stress induced dilation we found defines subjects at increased risk of future cerebral events". Lack of required blood flow increase to the brain during mental activities may potentially affect cognition and cerebral performance during complex cerebral tasks.1. Cerebrovascular mental stress reactivity is impaired in hypertension
3. BioMed Central (http://www.biomedcentral.com/) is an STM (Science, Technology and Medicine) publisher which has pioneered the open access publishing model. All peer-reviewed research articles published by BioMed Central are made immediately and freely accessible online, and are licensed to allow redistribution and reuse. BioMed Central is part of Springer Science+Business Media, a leading global publisher in the STM sector.
Graeme Baldwin | EurekAlert!
Further reports about: > BioMed > Cardiovascular Ultrasound > Cerebrovascular mental stress > Inappropriate vasoconstriction > STM > Ultrasound > artery disease > blood flow > cardiovascular disease > carotid artery reactivity > cerebral tasks > coronary artery disease > coronary heart disease > high blood pressure > mental stress
How prenatal maternal infections may affect genetic factors in Autism spectrum disorder
22.03.2017 | University of California - San Diego
22.03.2017 | Empa - Eidgenössische Materialprüfungs- und Forschungsanstalt
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
22.03.2017 | Materials Sciences
22.03.2017 | Physics and Astronomy
22.03.2017 | Materials Sciences