Peripheral blood flow regulation in response to sympathetic stimulation in individuals with down syndrome
Present address: California State University San Bernardino, 5500 University Parkway, San Bernardino CA 92407, CA, United States
- https://doi.org/10.1016/j.artres.2018.10.001How to use a DOI?
- Down syndrome, Blood flow, Sympathetic stimulus, Autonomic nervous system
Background: Individuals with Down syndrome (DS) experience autonomic dysfunction, with reduced sympathetic and parasympathetic control. This results in alterations in resting heart rate and blood pressure and attenuated responses to sympathoexcitatory stimuli. It is unknown to what extent this impacts the regulation of peripheral blood flow in response to sympathetic stimuli, which is an important prerequisite to exercise and perform work. Therefore, we aimed to investigate differences in peripheral blood flow regulation in response to lower body negative pressure (LBNP) between individuals with and without DS
Methods: Participants (n = 10 males with DS and n = 11 male controls, mean age 23.7 years ± 3.2) underwent 5 min of LBNP stimulations (−20 mmHg), after resting supine for 10 min. One minute steady state blood pressure and blood flow at baseline and during LBNP were obtained for analysis. Mean flow velocity and arterial diameters were recorded with ultrasonography; foreram blood flow (FBF), shear rate and forearm vascular conductance (FVC) were calculated using brachial blood pressure measured right before ultrasound recordings
Results: Participants with DS responded differently (consistent with reduced vasoconstrictive control) to the LBNP stimulus (significant ConditionxGroup interaction effect) for mean velocity (p = 0.02), FBF (p = 0.04), shear rate (p = 0.02) and FVC (p = 0.03), compared to participants without DS.
Conclusion: Young males with DS exhibit reduced peripheral blood flow regulation in response to LBNP compared to controls, indicating a blunted sympathetic control of blood flow. Further research is necessary to explore the impact of these findings on exercise and work capacity.
- © 2018 Association for Research into Arterial Structure and Physiology. Published by Elsevier B.V. All rights reserved.
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Cite this article
TY - JOUR AU - Thessa I.M. Hilgenkamp AU - Sang Ouk Wee AU - Elizabeth C. Schroeder AU - Tracy Baynard AU - Bo Fernhall PY - 2018 DA - 2018/10 TI - Peripheral blood flow regulation in response to sympathetic stimulation in individuals with down syndrome JO - Artery Research SP - 16 EP - 21 VL - 24 IS - C SN - 1876-4401 UR - https://doi.org/10.1016/j.artres.2018.10.001 DO - https://doi.org/10.1016/j.artres.2018.10.001 ID - Hilgenkamp2018 ER -