A high salt meal does not impair cerebrovascular reactivity in healthy young adults.
Physiol Rep
; 8(19): e14585, 2020 10.
Article
em En
| MEDLINE
| ID: mdl-33038066
ABSTRACT
A high sodium (Na+ ) meal impairs peripheral vascular function. In rodents, chronic high dietary Na+ impairs cerebral vascular function, and in humans, habitual high dietary Na+ is associated with increased stroke risk. However, the effects of acute high dietary Na+ on the cerebral vasculature in humans are unknown. The purpose of this study was to determine if acute high dietary Na+ impairs cerebrovascular reactivity in healthy adults. Thirty-seven participants (20F/17M; 25 ± 5 years; blood pressure [BP] 107 ± 9/61 ± 6 mm Hg) participated in this randomized, cross-over study. Participants were given a low Na+ meal (LSM; 138 mg Na+ ) and a high Na+ meal (HSM; 1,495 mg Na+ ) separated by ≥ one week. Serum Na+ , beat-to-beat BP, middle cerebral artery velocity (transcranial Doppler), and end-tidal carbon dioxide (PET CO2 ) were measured pre- (baseline) and 60 min post-prandial. Cerebrovascular reactivity was assessed by determining the percent change in middle cerebral artery velocity to hypercapnia (via 8% CO2 , 21% oxygen, balance nitrogen) and hypocapnia (via mild hyperventilation). Peripheral vascular function was measured using brachial artery flow-mediated dilation (FMD). Changes in serum Na+ were greater following the HSM (HSM Δ1.6 ± 1.2 mmol/L vs. LSM Δ0.7 ± 1.2 mmol/L, p < .01). Cerebrovascular reactivity to hypercapnia (meal effect p = .41) and to hypocapnia (meal effect p = .65) were not affected by the HSM. Contrary with previous findings, FMD was not reduced following the HSM (meal effect p = .74). These data suggest that a single high Na+ meal does not acutely impair cerebrovascular reactivity, and suggests that despite prior findings, a single high Na+ meal does not impair peripheral vascular function in healthy adults.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Circulação Cerebrovascular
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Hipocapnia
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Cloreto de Sódio na Dieta
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Artéria Cerebral Média
Tipo de estudo:
Clinical_trials
Limite:
Adolescent
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Adult
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Female
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Humans
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Male
Idioma:
En
Revista:
Physiol Rep
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Estados Unidos