Abstract:
BACKGROUND:Overweight/obese young men have increased sympatho-excitation to cold and pain stress-induced by the cold pressor test (CPT) that may lead to abnormal hemodynamic responses. Concurrent CPT and exercise may augment the sympathetic-induced increases in aortic blood pressure (BP), pressure wave reflection (augmentation index, AIx), and arterial stiffness (pulse wave velocity, PWV). Since obesity is related with hypertension and sympathetic activity, we evaluated the aortic hemodynamic and PWV responses to muscle metaboreflex activation imposed by postexercise muscle ischemia (PEMI) concurrent with CPT in overweight/obese men. METHODS:In 16 healthy (body mass index >25 and <40kg/m(2)) men (24±2 years), heart rate (HR), brachial BP, aortic BP, augmented pressure (AP), AIx, AIx adjusted to 75 beats/min (AIx@75), reflection time (Tr), first (P1) and second systolic peak (P2, wave reflection magnitude), and PWV (brachial-ankle PWV, baPWV) were evaluated at baseline, during isometric-handgrip exercise (IHG), and PEMI with (PEMI + CPT) and without CPT. RESULTS:During IHG, brachial BP, aortic BP, AP, AIx, AIx@75, P1, and P2 increased ( P < 0.01) while Tr decreased ( P < 0.05) compared with baseline. During PEMI, all hemodynamic parameters remained elevated ( P < 0.05) and baPWV increased (P < 0.05) while Tr and HR returned to baseline. Compared with PEMI, the increases in HR, brachial BP, aortic BP, AIx@75, P1, P2, and baPWV were greater ( P < 0.05) during PEMI + CPT. During PEMI + CPT, Tr remained lower ( P < 0.05) than baseline. CONCLUSIONS:Cold exposure with concurrent metaboreflex activation induces a significant increase in aortic hemodynamics and arterial stiffness, which may explain the high risk of adverse cardiovascular events during physiological stress. CLINICAL TRIALS REGISTRATION:Trial Number NCT02104375.
journal_name
Am J Hypertensjournal_title
American journal of hypertensionauthors
Kalfon R,Campbell J,Alvarez-Alvarado S,Figueroa Adoi
10.1093/ajh/hpv043subject
Has Abstractpub_date
2015-11-01 00:00:00pages
1332-8issue
11eissn
0895-7061issn
1941-7225pii
hpv043journal_volume
28pub_type
杂志文章,随机对照试验abstract::Solitary kidneys, especially in rats, appear vulnerable to develop functional and structural damage. However, differences in susceptibility exist between strains. It is not clear whether this is intrinsic to the kidney or due to environmental factors. Therefore, the aim of the present study was to investigate possible...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1016/s0895-7061(99)00024-2
更新日期:1999-06-01 00:00:00
abstract::The renin content, expressed as nanograms of angiotensin I/hour/milligram, of a rabbit intrarenal arterial network (IAN) was compared to that of renal cortical samples from the same animal. Tissues from six rabbits were studied. Cortical tissue (RC) and an IAN with some glomeruli and attached arterioles (IAN + glomeru...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1016/0895-7061(94)00073-k
更新日期:1995-04-01 00:00:00
abstract::Previous work in this laboratory has shown that supplemental dietary calcium using milk as the source can lower blood pressure and serum cholesterol levels. Attempting to circumvent lactose intolerance, a 6-month crossover study of blood pressure and serum lipids in 50 free-living volunteers was done comparing 1,150 m...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1093/ajh/1.3.149s
更新日期:1988-07-01 00:00:00
abstract:BACKGROUND:Differences between the antihypertensive responses to drug therapy measured by office blood pressure (OBP) and ambulatory blood pressure monitoring (ABPM) techniques have been noted but rarely analyzed. We studied whether the OBP and 24-h ABPM responses to hydrochlorothiazide differ and, if so, the relevance...
journal_title:American journal of hypertension
pub_type: 临床试验,杂志文章
doi:10.1016/j.amjhyper.2004.10.021
更新日期:2005-03-01 00:00:00
abstract:BACKGROUND:One effort to improve hypertension care in the United States is the development of the "Hypertension Specialist" program with appropriate training and certification of individual physicians. METHODS:We examined the impact of a hypertension clinic on blood pressure (BP) levels and control. RESULTS:By one ye...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1016/s0895-7061(03)01030-6
更新日期:2003-10-01 00:00:00
abstract:BACKGROUND:Peroxisome proliferator-activated receptor-gamma (PPAR-gamma) is a member of the nuclear receptor family that has been implicated in cell differentiation and proliferation, glucose metabolism, macrophage development, and inflammatory responses. PPAR-gamma can be activated by a range of synthetic substances a...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1038/ajh.2007.39
更新日期:2008-02-01 00:00:00
abstract:BACKGROUND:Cardiovascular diseases (CVD) are responsible for more than 50% of the deaths in patients with end-stage renal disease (ESRD). Sleep apnea (SA) has been recognized as a risk factor for CVD. Previous studies have shown a higher prevalence of SA among patients on dialysis. METHODS:Forty-five nondiabetics pati...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1016/j.amjhyper.2004.08.028
更新日期:2005-02-01 00:00:00
abstract:BACKGROUND:Renal angiography (RA) is considered to be the gold standard for the diagnosis of renal artery stenosis (RAS). However, it is invasive and potentially harmful; hence there is a need for an optimal noninvasive test. Magnetic resonance angiography (MRA) is currently accepted as the optimal noninvasive test by ...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1016/j.amjhyper.2003.07.016
更新日期:2003-12-01 00:00:00
abstract::The efficacy and safety of doxazosin (DOX) for the treatment of hypertension was investigated. A multicenter, double-blind, placebo-controlled, parallel design was employed. A 4-week placebo runin period was followed by a 9-week double-blind period during which patients were randomly assigned to placebo or 2, 4, or 8 ...
journal_title:American journal of hypertension
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1093/ajh/1.2.158
更新日期:1988-04-01 00:00:00
abstract::We investigated whether the slow pressor action of small doses of angiotensin II (ANG II) administered to rats was accompanied by the development of structural vascular changes. Male Sprague-Dawley rats (350 to 400 g) were given ANG II intraperitoneally, 200 ng/kg/min, for 7 to 10 days or 6 weeks, or 100 ng/kg/min for...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1016/0895-7061(94)00192-E
更新日期:1995-01-01 00:00:00
abstract::The principal aim of the present study was to determine the relationship of ambulatory blood pressure (BP) to urinary electrolyte excretion in normotensives. Twenty-five young adults underwent ambulatory BP and heart rate monitoring while collecting urine over 24 h. The correlations of 24 h urine sodium excretion and ...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1093/ajh/6.6.480
更新日期:1993-06-01 00:00:00
abstract:BACKGROUND:Sympathetic activation occurs in hypertension (HT) and after acute myocardial infarction (AMI) and is related to greater cardiovascular risk. Also, AMI in patients with HT (AMI-HT) carries greater risk than that in normal subjects (AMI-NT). We therefore planned to determine whether the sympathetic activation...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1016/j.amjhyper.2006.03.015
更新日期:2006-10-01 00:00:00
abstract:BACKGROUND:Many patients prefer herbal medications to conventional drugs. Limited trial evidence suggests that garlic preparations reduce high blood pressure (BP). METHODS:We searched electronic databases through March 2014 to identify all randomized controlled trials that compared a garlic preparation to placebo in h...
journal_title:American journal of hypertension
pub_type: 杂志文章,meta分析,评审
doi:10.1093/ajh/hpu165
更新日期:2015-03-01 00:00:00
abstract::Abnormal calcium metabolism has been implicated in human hypertension. Caffeine consumption may contribute to hypertension since it increases urinary calcium excretion. Nineteen hypertensive subjects (HTN) and nineteen age and gender matched normotensive controls (NTC) who habitually consumed at least 175 mg caffeine ...
journal_title:American journal of hypertension
pub_type: 临床试验,杂志文章
doi:10.1016/0895-7061(95)00337-1
更新日期:1996-03-01 00:00:00
abstract:BACKGROUND:Salt sensitivity of blood pressure (SSBP) increases the risk of cardiovascular complications, and the heritability of SSBP is about 50% in Chinese population. However, studies identifying genes involved in BP responses to acute sodium loading and diuresis shrinkage are still limited. METHOD:A total of 342 e...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1093/ajh/hpx179
更新日期:2018-03-10 00:00:00
abstract::We have previously reported that young, primigravid, African-American women who developed preeclampsia exhibited insulin resistance (elevated fasting insulin:glucose ratios) and abnormal intracellular free calcium ([Ca2+]i) metabolism as early as the second trimester of pregnancy. To determine if these abnormalities p...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1093/ajh/6.4.302
更新日期:1993-04-01 00:00:00
abstract:BACKGROUND:The presence of asymptomatic left ventricular diastolic dysfunction (LVDD) in hypertensive patients can be associated with the development of cardiac events. The increase in sympathetic activity may be 1 of the mechanisms that predisposes to this outcome. In this study, we analyzed 2 hypotheses: (i) whether ...
journal_title:American journal of hypertension
pub_type: 杂志文章,随机对照试验
doi:10.1093/ajh/hpt032
更新日期:2013-07-01 00:00:00
abstract:BACKGROUND:In middle-aged and elderly populations, circulating natriuretic peptide concentrations are negatively associated with several components of the metabolic syndrome. Whether these negative associations are also present in healthy adolescents and young adults from the general population are unknown. METHODS:In...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1093/ajh/hpx026
更新日期:2017-06-01 00:00:00
abstract::During the course of a long-term, prospective, randomized study in 77 hypertensive nephrosclerosis patients, five patients developed evidence suggestive of renal artery stenosis. However, arteriography demonstrated patent renal arteries. The evidence suggestive of renal artery stenosis was: (1) converting-enzyme inhib...
journal_title:American journal of hypertension
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1093/ajh/2.5.349
更新日期:1989-05-01 00:00:00
abstract:BACKGROUND:Although a hypertensive response to exercise (HRE) is associated with cardiac risk and masked hypertension (MHT), its mechanisms and appropriate treatment remain unclear. We investigated spironolactone as a treatment for abnormal vascular and myocardial stiffness in HRE. METHODS:In this randomized, double-b...
journal_title:American journal of hypertension
pub_type: 杂志文章,随机对照试验
doi:10.1093/ajh/hpt008
更新日期:2013-05-01 00:00:00
abstract:BACKGROUND:It is not clear which educational strategy is most effective in helping patients to change their lifestyles. This study compared the efficacy of two different educational models on reducing blood pressure (BP). METHODS:This was a randomized controlled trial in ambulatory hypertensive patients >65 years of a...
journal_title:American journal of hypertension
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.amjhyper.2005.10.005
更新日期:2006-07-01 00:00:00
abstract:BACKGROUND:About one-half of all hypertensive adults do not have their blood pressure controlled. They are often prescribed medications that conform to national guidelines but they continue to have elevated blood pressure. This public health problem might be improved by applying plasma renin guided therapy. RESULTS:A ...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1093/ajh/hpx068
更新日期:2017-09-01 00:00:00
abstract::Serotonin-containing neurons in the central nervous system are grouped into a number of discrete and distinctive collections with cell bodies in the brainstem and projections passing to many regions of the brain and spinal cord. Evidence is presented that activation of one projection of serotonin-containing neurons fr...
journal_title:American journal of hypertension
pub_type: 杂志文章,评审
doi:10.1093/ajh/1.1.79
更新日期:1988-01-01 00:00:00
abstract:BACKGROUND:Retinal abnormalities, particularly arteriolar narrowing, are powerful predictors of cardiovascular events. The precision of internists and ophthalmologists in the assessment of retinal vessels widths has been disputed but not evaluated against a technology of edge detection. METHODS:Fifty-two patients with...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1016/j.amjhyper.2006.10.012
更新日期:2007-05-01 00:00:00
abstract::Angiotensin II (Ang II) and transforming growth factor-beta (TGF-beta) modulate cell growth and metabolism. Our objective was to evaluate the effect of Ang II on the characteristics and expression of TGF-beta receptors on vascular smooth muscle cells (VSMC) from Wistar-Kyoto rats. The addition of TGF-beta1 elicited a ...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1016/s0895-7061(99)00152-1
更新日期:2000-02-01 00:00:00
abstract:BACKGROUND:Beetroot has attracted much attention because of its blood pressure-lowering properties. Although beetroot contains various nutritional compounds, including inorganic nitrate, some of their physiological properties are not fully understood. In this study, we examined whether betanin, a beetroot component, ha...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1093/ajh/hpaa006
更新日期:2020-04-01 00:00:00
abstract:BACKGROUND:Uncontrolled treatment-resistant hypertension (TRH), i.e., blood pressure (BP, mm Hg) ≥140/≥90mm Hg in and out of office on ≥3 different BP medications at optimal doses, is common and has a poor prognosis. Aldosterone antagonist (AA) and renin-guided therapy (RGT) are effective strategies for improving BP co...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1093/ajh/hpw016
更新日期:2016-08-01 00:00:00
abstract::To elucidate whether postprandial hypotension (PPH) is associated with any diurnal change of blood pressure, ambulatory blood pressure monitoring was performed on 121 hospitalized essential hypertensive patients who received standardized meals. Postprandial change in blood pressure was defined as the difference betwee...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1016/s0895-7061(98)00161-7
更新日期:1998-11-01 00:00:00
abstract:BACKGROUND:Morning blood pressure (BP) surge seems to be a risk factor for cardiovascular events. Although physical activity after arising significantly affects morning BP surge, it has remained unclear whether morning BP surge after controlling for physical activity (morning BP reactivity) is associated with target or...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1016/j.amjhyper.2005.06.015
更新日期:2005-12-01 00:00:00
abstract::To evaluate the clinical importance of serum hepatocyte growth factor (HGF) concentration, we designed two clinical investigations. The first study analyzed the correlation between serum HGF concentration and clinical arterial stiffness or the vasodilator response to reactive hyperemia in hypertensive patients. The se...
journal_title:American journal of hypertension
pub_type: 杂志文章
doi:10.1016/s0895-7061(02)02274-4
更新日期:2002-06-01 00:00:00