Journal article
Aging reduces cerebral blood flow regulation following an acute hypertensive stimulus
Journal of applied physiology (1985), Vol.128(5), pp.1186-1195
05/01/2020
DOI: 10.1152/japplphysiol.00137.2019
PMID: 32240012
Abstract
Aging increases arterial stiffness, which has a negative impact on cerebral blood flow (CBF) regulation (decreases CBF and increases CBF pulsatility). The association between arterial stiffness and CBF pulsatility may, in part, explain the relationship between elevated blood pressure (BP) fluctuations and end-organ disease with aging. To understand the mechanisms by which large BP alterations influence cerebral blood flow regulation in both young and old, we examined the effects of age on central and cerebral blood flow regulation following an acute hypertensive stimulus [resistance-exercise (RE)]. Measurements were obtained pre and immediately, 5, and 30 min post-RE in young (n = 35) and older (n = 26) adults. Measurements included cerebral blood velocity (CBv), CBv pulsatility, central pulse-wave velocity (PWV), beta-stiffness index (beta), and carotid blood flow pulsatility. Central hemodynamics and BP were continuously recorded. Mean CBv increased immediately post-RE only in the young and decreased below baseline at 5 min post-RE in both groups (interaction. P < 0.05). Older adults had a greater increase in CBv pulsatility immediately post-RE compared with the young (interaction, P < 0.05). Mean BP was higher and carotid pulsatility was lower in the older group and increased immediately post-RE in both groups (P < 0.05). PWV increased immediately post-RE (P < 0.05). There were no changes in beta. In conclusion, with aging, greater central arterial stiffness leads to a greater transmission of pulsatile blood velocity from the systemic circulation to the cerebral circulation following an acute hypertensive stress.
NEW & NOTEWORTHY Reductions in cerebral blood flow and increases in flow pulsatility with aging are associated to cerebrovascular disease; however, little is known about how an acute hypertensive stimulus effects cerebral blood flow regulation in an aged population. Following the hypertensive stimulus, older adults elicit an attenuated increase in cerebral blood velocity and greater transmission of pulsatile velocity to the brain compared with young adults, demonstrating reduced cerebral blood flow regulation to elevated blood pressure responses with aging.
Details
- Title: Subtitle
- Aging reduces cerebral blood flow regulation following an acute hypertensive stimulus
- Creators
- Alexander J. Rosenberg - University of Illinois ChicagoElizabeth C. Schroeder - University of Illinois ChicagoGeorgios Grigoriadis - University of Illinois ChicagoSang Ouk Wee - California State University, San BernardinoKanokwan Bunsawat - University of Illinois ChicagoKevin S. Heffernan - Syracuse UniversityBo Fernhall - University of Illinois Urbana-ChampaignTracy Baynard - University of Illinois Urbana-Champaign
- Resource Type
- Journal article
- Publication Details
- Journal of applied physiology (1985), Vol.128(5), pp.1186-1195
- DOI
- 10.1152/japplphysiol.00137.2019
- PMID
- 32240012
- NLM abbreviation
- J Appl Physiol (1985)
- ISSN
- 8750-7587
- eISSN
- 1522-1601
- Publisher
- Amer Physiological Soc
- Number of pages
- 10
- Language
- English
- Date published
- 05/01/2020
- Academic Unit
- Health, Sport, and Human Physiology
- Record Identifier
- 9984948046302771
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