Results 51 to 60 of about 10,602 (234)

Influence of 100% and 40% oxygen on penumbral blood flow, oxygen level, and T2*-weighted MRI in a rat stroke model [PDF]

, 2011
Accurate imaging of the ischemic penumbra is a prerequisite for acute clinical stroke research. T2* magnetic resonance imaging (MRI) combined with an oxygen challenge (OC) is being developed to detect penumbra based on changes in blood deoxyhemoglobin ...
Baskerville, Tracey, Deuchar, Graeme A., Holmes, William M., Macrae, I. Mhairi, McCabe, Chris, Robertson, Craig A., Santosh, Celestine   +6 more
core   +1 more source

Cerebral oxygen extraction across different exercise intensities: Role of arterial PCO2${P_{{\mathrm{C}}{{\mathrm{O}}_2}}}$

Experimental Physiology, EarlyView.
Abstract Stability in cerebral oxygen extraction fraction (OEF) is typically determined by alterations in cerebral blood flow (CBF). At rest, arterial partial pressure of carbon dioxide (PaCO2${P_{{\mathrm{aC}}{{\mathrm{O}}_2}}}$) and OEF exhibit a strong inverse relationship owing to the powerful influence of PaCO2${P_{{\mathrm{aC}}{{\mathrm{O}}_2}}}$
L. Madden Brewster, Travis Dylan Gibbons, Hannah Grace Caldwell, Connor A. Howe, Jennifer S. Duffy, Andrew R. Steele, Justin A. Monteleone, Jay M. J. R. Carr, Jodie Lauren Koep, Tenasia D. R. Monaghan, David B. MacLeod, Philip N. Ainslie   +11 more
wiley   +1 more source

Effects of changes in end‐tidal PO2 and PCO2 on neural responses during rest and sustained attention

Physiological Reports, 2021
Impairments of cognitive function during alterations in arterial blood gases (e.g., high‐altitude hypoxia) may result from the disruption of neurovascular coupling; however, the link between changes in arterial blood gases, cognition, and cerebral blood ...
Tom Bullock, Barry Giesbrecht, Andrew E. Beaudin, Bradley G. Goodyear, Marc J. Poulin   +4 more
doaj   +1 more source

Cerebral haemodynamic responses to inspiratory muscle work

Experimental Physiology, EarlyView.
Abstract Fatiguing inspiratory work has been shown to evoke a sympathetically mediated reflex that has systemic cardiovascular consequences, including increases in heart rate and blood pressure and a decrease in resting limb vascular conductance. Moreover, the response to this reflex appears to be attenuated in females compared with males.
Andrew H. Ramsook, Morgan A. Hughes, Wyatt W. Pruter, Kevin L. Webb, Ali Ataie, Chad C. Wiggins, Gabrielle A. Dillon, Sarah E. Baker, Michael J. Joyner   +8 more
wiley   +1 more source

Neurovascular Coupling Remains Intact During Incremental Ascent to High Altitude (4240 m) in Acclimatized Healthy Volunteers

Frontiers in Physiology, 2018
Neurovascular coupling (NVC) is the temporal link between neuronal metabolic activity and regional cerebral blood flow (CBF), supporting adequate delivery of nutrients.
Jack K. Leacy, Jack K. Leacy, Shaelynn M. Zouboules, Carli R. Mann, Joel D. B. Peltonen, Gurkan Saran, Cassandra E. Nysten, Heidi E. Nysten, Tom D. Brutsaert, Ken D. O’Halloran, Mingma T. Sherpa, Trevor A. Day   +11 more
doaj   +1 more source

The use of DCEEG to estimate functional and metabolic state of nervous tissue of the brain at hyper- and hypoventilation [PDF]

, 2011
A pilot study has been made of the simultaneous DC potential and total slow electrical activity changes during modeling various metabolic and functional states of the human brain.
Sergey Murik
core   +1 more source

Cerebral tissue pO2 response to stimulation is preserved with age in awake mice [PDF]

, 2019
Published in final edited form as: Neurosci Lett. 2019 April 23; 699: 160–166. doi:10.1016/j.neulet.2019.02.007.Compromised oxygen supply to cerebral tissue could be an important mechanism contributing to age-related cognition decline. We recently showed
Boas, David, Bélanger, Samuel, Kakkar, Ashok, Lesage, Frédéric, Lu, Xuecong, Moeini, Mohammad, Picard, Frédéric   +6 more
core   +1 more source

No difference in mean middle cerebral artery blood velocity responses between lower‐ and upper‐body unilateral resistance exercise in untrained individuals

Experimental Physiology, EarlyView.
Abstract Dynamic resistance exercise (RE) produces sinusoidal fluctuations in blood pressure that are mirrored by middle cerebral artery blood velocity (MCAv). However, whether lower‐ or upper‐body RE elicits a differential cerebrovascular response has not yet been examined.
Stephanie Korad, Toby Mündel, Blake G. Perry   +2 more
wiley   +1 more source

Hyperventilation Therapy for Control of Posttraumatic Intracranial Hypertension

Frontiers in Neurology, 2017
During traumatic brain injury, intracranial hypertension (ICH) can become a life-threatening condition if it is not managed quickly and adequately. Physicians use therapeutic hyperventilation to reduce elevated intracranial pressure (ICP) by manipulating
Daniel Agustín Godoy, Daniel Agustín Godoy, Ali Seifi, David Garza, Santiago Lubillo-Montenegro, Francisco Murillo-Cabezas   +5 more
doaj   +1 more source

pH of soul: how does acid-base balance affect our cognition? [PDF]

BioImpacts, 2014
Respiratory Alkalosis due to changes in sympathetic hyperarousal during pathological emotional states can change our cognitive abilities. This occurs through the effects of Alkalosis upon cerebral vasoconstriction and the amount of ionized calcium in ...
Farnam Alireza
doaj   +1 more source