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The effects of sympathetic activity induced by ice water on blood flow and brachial artery flow-mediated dilatation response in healthy volunteers


Autoři: Kristian Magnus Gundersen aff001;  Christoffer Nyborg aff001;  Øyvind Heiberg Sundby aff001;  Jonny Hisdal aff001
Působiště autorů: Section of Vascular Investigations, Department of Vascular Surgery, Division of Cardiovascular and Pulmonary Diseases, Oslo University Hospital, Oslo, Norway aff001;  Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Oslo, Norway aff002
Vyšlo v časopise: PLoS ONE 14(9)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0219814

Souhrn

Objective

To investigate the association between sympathetic activity, reactive hyperemia and brachial artery flow-mediated dilation (FMD).

Background

It is claimed that major surgery has an impact on endothelial function, as observed by post-operative reduced brachial artery FMD response. However, another explanation for the observed reduced FMD response post-operatively may be sympathetic stress-induced reduction in blood flow.

Methods

Seventeen healthy volunteers with a median age (25th-75th percentiles) of 23.5 (23–24.8) years were recruited. Participants’ brachial blood flow and FMD response were measured (i) during normal non-stress conditions (Normal1); (ii) during exposure to ice water; and (iii) afterwards, under normal non-stress conditions (Normal2). We continuously measured arterial blood pressure (Finometer), heart rate (ECG), skin blood flow of the index finger (laser Doppler), and brachial artery blood flow and diameter (Ultrasound Doppler). Measurements were taken at baseline; before a 5-min suprasystolic forearm occlusion; and following a 3-min post-occlusion, to measure reactive hyperemia and FMD.

Results

Median (25th-75th percentiles) FMD response after exposure to ice water was reduced compared to non-stress conditions [4.9 (2.9–8.4) % during ice water vs. 9.7 (7.6–12.2) % Normal1 and 9.7 (6.4–10.3) % Normal2, P < 0.001]. Blood flow 60 s after cuff-deflation during ice water exposure was significantly reduced to 328 (289–421) mL compared to non-stress conditions (both P < 0.05). No differences were observed between Normal1 [446 (359–506) mL] and Normal2 [455 (365–515) mL] (both P > 0.05). Heart rate significantly increased during ice water exposure [67 (59–69) beats/min)] compared to 55 (49–60) beats/min during Normal1 and 54 (47–60) beats/min during Normal2 (both P < 0.05). MAP did not change during Normal1 [72 (64–84)] or during Normal2 [71 (65–81) mm Hg] (both P > 0.05), but increased to 86 (75–98) mm Hg during ice water exposure (P < 0.05).

Conclusions

Increased sympathetic activity resulted in decreased blood flow and brachial artery FMD response in healthy volunteers, independent of endothelial dysfunction. Future studies should adjust for blood flow when interpreting the FMD response.

Klíčová slova:

Biology and life sciences – Anatomy – Body fluids – Blood – Blood flow – Physiology – Medicine and health sciences – Cardiovascular anatomy – Blood vessels – Arteries – Vascular medicine – Blood pressure – Public and occupational health – Physical activity – Surgical and invasive medical procedures – Cardiovascular procedures – Vascular surgery – Cardiology – Heart rate – Physical sciences – Physics – Classical mechanics – Mechanical stress – Shear stresses


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