Author |
Sales, Allan R. K.
![]() Fernandes, Igor A. ![]() Rocha, Natalia G. ![]() Costa, Lucas S. ![]() Rocha, Helena N. M. ![]() Mattos, Joao D. M. ![]() Vianna, Lauro C. ![]() Silva, Bruno M. ![]() ![]() Nobrega, Antonio C. L. ![]() |
Institution | Universidade Federal Fluminense (UFF) Universidade Federal de São Paulo (UNIFESP) |
Abstract | Mental stress induces transient endothelial dysfunction, which is an important finding for subjects at cardiometabolic risk. Thus, we tested whether aerobic exercise prevents this dysfunction among subjects with metabolic syndrome (MetS) and whether an increase in shear rate during exercise plays a role in this phenomenon. Subjects with MetS participated in two protocols. in protocol 1 (n = 16), endothelial function was assessed using brachial artery flow-mediated dilation (FMD). Subjects then underwent a mental stress test followed by either 40 min of leg cycling or rest across two randomized sessions. FMD was assessed again at 30 and 60 min after exercise or rest, with a second mental stress test in between. Mental stress reduced FMD at 30 and 60 min after the rest session (baseline: 7.7 +/- 0.4%, 30 min: 5.4 +/- 0.5%, and 60 min: 3.9 +/- 0.5%, P < 0.05 vs. baseline), whereas exercise prevented this reduction (baseline: 7.5 +/- 0.4%, 30 min: 7.2 +/- 0.7%, and 60 min: 8.7 +/- 0.8%, P > 0.05 vs. baseline). Protocol 2 (n = 5) was similar to protocol 1 except that the first period of mental stress was followed by either exercise in which the brachial artery shear rate was attenuated via forearm cuff inflation or exercise without a cuff. Noncuffed exercise prevented the reduction in FMD (baseline: 7.5 +/- 0.7%, 30 min: 7.0 +/- 0.7%, and 60 min: 8.7 +/- 0.8%, P > 0.05 vs. baseline), whereas cuffed exercise failed to prevent this reduction (baseline: 7.5 +/- 0.6%, 30 min: 5.4 +/- 0.8%, and 60 min: 4.1 +/- 0.9%, P < 0.05 vs. baseline). in conclusion, exercise prevented mental stress-induced endothelial dysfunction among subjects with MetS, and an increase in shear rate during exercise mediated this effect. |
Keywords |
flow-mediated dilation
shear rate mental stress test aerobic exercise |
Language | English |
Sponsor | Brazilian National Council of Scientific and Technological Development Foundation of Research Support of Rio de Janeiro State Coordination for the Improvement of Higher Education Personnel Brazilian Funding Agency for Studies and Projects |
Date | 2014-04-01 |
Published in | American Journal of Physiology-heart and Circulatory Physiology. Bethesda: Amer Physiological Soc, v. 306, n. 7, p. H963-H971, 2014. |
ISSN | 0363-6135 (Sherpa/Romeo, impact factor) |
Publisher | Amer Physiological Soc |
Extent | H963-H971 |
Origin |
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Access rights | Open access ![]() |
Type | Article |
Web of Science ID | WOS:000334077400004 |
URI | http://repositorio.unifesp.br/handle/11600/37580 |
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