51
|
Vanaelst B, Michels N, Huybrechts I, Clays E, Flórez MR, Balcaen L, Resano M, Aramendia M, Vanhaecke F, Rivet N, Raul JS, Lanfer A, De Henauw S. Cross-sectional relationship between chronic stress and mineral concentrations in hair of elementary school girls. Biol Trace Elem Res 2013; 153:41-9. [PMID: 23546894 DOI: 10.1007/s12011-013-9647-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Accepted: 03/15/2013] [Indexed: 01/04/2023]
Abstract
Chronic stress exposure is associated with diverse negative health outcomes. It has been hypothesised that stress may also negatively affect the body's mineral status. This study investigates the association between chronic stress and long-term mineral concentrations of calcium (Ca), copper (Cu), iron (Fe), magnesium (Mg), phosphorus (P) and zinc (Zn) in scalp hair among elementary school girls. Complete information on child-reported stress estimates (Coddington Life Events Scale (CLES)), hair cortisone and hair mineral concentrations, and predefined confounders in the stress-mineral relationship (i.e. age, body mass index, physical activity, diet, hair colour and parental education) was provided cross-sectionally for 140 girls (5-10 years old). The relationship between childhood stress measures (predictor) and hair minerals (outcome) was studied using linear regression analysis, adjusted for the abovementioned confounders. Hair cortisone concentrations were inversely associated with hair mineral concentrations of Ca, Mg, Zn and the Ca/P ratio. Children at risk by life events (CLES) presented an elevated Ca/Mg ratio. These findings were persistent after adjustment for confounders. This study demonstrated an independent association between chronic stress measures and hair mineral levels in young girls, indicating the importance of physiological stress-mineral pathways independently from individual or behavioural factors. Findings need to be confirmed in a more heterogeneous population and on longitudinal basis. The precise mechanisms by which stress alters hair mineral levels should be further elucidated.
Collapse
Affiliation(s)
- Barbara Vanaelst
- Department of Public Health, Ghent University, De Pintelaan 185, 2 block A, 9000 Ghent, Belgium.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
52
|
Association between weekend catch-up sleep duration and hypertension in Korean adults. Sleep Med 2013; 14:549-54. [DOI: 10.1016/j.sleep.2013.02.009] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Revised: 02/04/2013] [Accepted: 02/08/2013] [Indexed: 11/15/2022]
|
53
|
Relationship of depression, stress and endothelial function in stable angina patients. Physiol Behav 2013; 118:152-8. [PMID: 23688945 DOI: 10.1016/j.physbeh.2013.05.024] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Accepted: 05/08/2013] [Indexed: 12/25/2022]
Abstract
Endothelial dysfunction has been considered as one of potential mechanisms by which depression and stress might contribute to the development of coronary artery disease (CAD). Recent studies suggest that circulating endothelial progenitor cells (EPCs) and brachial artery flow-mediated dilation (FMD) are related to endothelial function and progression of CAD. We investigated the relationships between the level of circulating CD34/KDR(+) EPCs and CD133/KDR(+) EPCs, brachial FMD, and scores of depression and stress measured with the Depression Anxiety Stress Scales in 288 stable angina patients without major psychiatric disorders. As defined by the ≥75th percentile, 100 (35%) subjects had high depression score (≥8), and 84 (29%) subjects had high stress score (≥10). Subjects with high depression or stress score had significantly lower FMD (1.86±0.14 vs. 3.63±0.17%, p<0.001; 2.05±0.18 vs. 3.48±0.17%, p<0.001) and percentage of circulating CD34/KDR(+) EPCs (0.97±0.11 vs. 1.94±0.17%, p<0.001; 1.09±0.13 vs. 1.68±0.16%, p=0.005), but not CD133/KDR(+) EPCs (0.52±0.04 vs. 0.66±0.06%, p=0.057; 0.61±0.05 vs. 0.59±0.05%, p=0.833), as compared with subjects with normal depression or stress score. Multivariate regression analysis indicated that high depression score (OR 1.09, 95% CI: 1.04-1.15, p<0.001), but not stress score or percentage of circulating EPCs, independently predicted impaired brachial FMD. In conclusions, our results demonstrated that in stable angina patients without major psychiatric disorders, a high depression or stress score was related to attenuated brachial FMD and depletion of circulating EPCs. However, only the depression score, but not the stress score or the level of EPCs, was an independent predictor for decreased brachial FMD.
Collapse
|
54
|
Pandey A, Williams N, Donat M, Ceide M, Brimah P, Ogedegbe G, McFarlane SI, Jean-Louis G. Linking sleep to hypertension: greater risk for blacks. Int J Hypertens 2013; 2013:436502. [PMID: 23710339 PMCID: PMC3654341 DOI: 10.1155/2013/436502] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2012] [Accepted: 02/06/2013] [Indexed: 12/11/2022] Open
Abstract
Background. Evidence suggests that insufficient sleep duration is associated with an increased likelihood for hypertension. Both short (<6 hours) and long (>8 hour) sleep durations as well as hypertension are more prevalent among blacks than among whites. This study examined associations between sleep duration and hypertension, considering differential effects of race and ethnicity among black and white Americans. Methods. Data came from a cross-sectional household interview with 25,352 Americans (age range: 18-85 years). Results. Both white and black short sleepers had a greater likelihood of reporting hypertension than those who reported sleeping 6 to 8 hours. Unadjusted logistic regression analysis exploring the race/ethnicity interactions between insufficient sleep and hypertension indicated that black short (<6 hours) and long (>8 hours) sleepers were more likely to report hypertension than their white counterparts (OR = 1.34 and 1.37, resp.; P < 0.01). Significant interactions of insufficient sleep with race/ethnicity were observed even after adjusting to effects of age, sex, income, education, body mass index, alcohol use, smoking, emotional distress, diabetes, coronary heart disease, and stroke. Conclusion. Results suggest that the race/ethnicity interaction is a significant mediator in the relationship between insufficient sleep and likelihood of having a diagnosis of hypertension.
Collapse
Affiliation(s)
- A. Pandey
- Brooklyn Health Disparities Center, Department of Medicine, SUNY Downstate Medical Center, P.O. Box 1199, 450 Clarkson Avenue, Brooklyn, NY 11203-2098, USA
| | - N. Williams
- Brooklyn Health Disparities Center, Department of Medicine, SUNY Downstate Medical Center, P.O. Box 1199, 450 Clarkson Avenue, Brooklyn, NY 11203-2098, USA
| | - M. Donat
- Brooklyn Health Disparities Center, Department of Medicine, SUNY Downstate Medical Center, P.O. Box 1199, 450 Clarkson Avenue, Brooklyn, NY 11203-2098, USA
| | - M. Ceide
- Brooklyn Health Disparities Center, Department of Medicine, SUNY Downstate Medical Center, P.O. Box 1199, 450 Clarkson Avenue, Brooklyn, NY 11203-2098, USA
| | - P. Brimah
- Brooklyn Health Disparities Center, Department of Medicine, SUNY Downstate Medical Center, P.O. Box 1199, 450 Clarkson Avenue, Brooklyn, NY 11203-2098, USA
| | - G. Ogedegbe
- Center for Healthful Behavior Change, Division of Internal Medicine, NYU Medical Center, NY, USA
| | - S. I. McFarlane
- Division of Endocrinology, Diabetes, and Hypertension, SUNY Downstate Medical Center, NY, USA
| | - G. Jean-Louis
- Brooklyn Health Disparities Center, Department of Medicine, SUNY Downstate Medical Center, P.O. Box 1199, 450 Clarkson Avenue, Brooklyn, NY 11203-2098, USA
- Sleep Disorders Center, Department of Medicine, SUNY Downstate Medical Center, NY, USA
| |
Collapse
|
55
|
Strand LB, Laugsand LE, Skaug EA, Ellingsen Ø, Madssen E, Wisløff U, Vatten L, Janszky I. Insomnia and endothelial function - the HUNT 3 fitness study. PLoS One 2012; 7:e50933. [PMID: 23236412 PMCID: PMC3516514 DOI: 10.1371/journal.pone.0050933] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Accepted: 10/26/2012] [Indexed: 01/20/2023] Open
Abstract
Background Insomnia is associated with increased risk of coronary heart disease (CHD), but the underlying mechanisms are not understood. To our knowledge, no previous studies have examined insomnia in relation to endothelial function, an indicator of preclinical atherosclerosis. Our aim was to assess the association of insomnia with endothelial function in a large population based study of healthy individuals. Methods A total of 4 739 participants free from known cardiovascular or pulmonary diseases, cancer, and sarcoidosis, and who were not using antihypertensive medication were included in the study. They reported how often they had experienced difficulties falling asleep at night, repeated awakenings during the night, early awakenings without being able to go back to sleep, and daytime sleepiness. Endothelial function was measured by flow mediated dilation (FMD) derived from the brachial artery. Results We found no consistent association between the insomnia symptoms and endothelial function in multiadjusted models, but individual insomnia symptoms may be related to endothelial function. Among women who reported early awakenings, endothelial function may be lower than in women without this symptom (p = 0.03). Conclusions This study provided no evidence that endothelial function, an early indicator of atherosclerosis, is an important linking factor between insomnia and CHD. Further studies are needed to explore the complex interrelation between sleep and cardiovascular pathology.
Collapse
Affiliation(s)
- Linn B Strand
- Department of Public Health and General Practice, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway.
| | | | | | | | | | | | | | | |
Collapse
|
56
|
Abstract
Untreated obstructive sleep apnea (OSA) is increasingly recognized as a risk factor contributing to cardiovascular morbidity and mortality. Research in recent decades has uncovered many components of the complex pathological events leading to the atherosclerotic vascular diseases in OSA, which involve heightened oxidative stress as a result of intermittent hypoxia, vascular inflammation, activation of platelet and coagulation cascades, endothelial dysfunction and ultimately the formation of atherosclerotic plagues. The close association of OSA and conventional cardiovascular risk factors including hypertension, diabetes mellitus, dyslipidemia and obesity adds to the adverse cardiovascular sequelae. Further studies are required to clarify further on the pathophysiological processes, and the effect size of OSA therapy, and other potential preventive strategies.
Collapse
Affiliation(s)
- Macy Mei-Sze Lui
- Department of Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong, China
| | | |
Collapse
|
57
|
Yang H, Durocher JJ, Larson RA, Dellavalla JP, Carter JR. Total sleep deprivation alters cardiovascular reactivity to acute stressors in humans. J Appl Physiol (1985) 2012; 113:903-8. [PMID: 22815387 DOI: 10.1152/japplphysiol.00561.2012] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Exaggerated cardiovascular reactivity to mental stress (MS) and cold pressor test (CPT) has been linked to increased risk of cardiovascular disease. Recent epidemiological studies identify sleep deprivation as an important risk factor for hypertension, yet the relations between sleep deprivation and cardiovascular reactivity remain equivocal. We hypothesized that 24-h total sleep deprivation (TSD) would augment cardiovascular reactivity to MS and CPT and blunt the MS-induced forearm vasodilation. Because the associations between TSD and hypertension appear to be stronger in women, a secondary aim was to probe for sex differences. Mean arterial pressure (MAP), heart rate (HR), and muscle sympathetic nerve activity (MSNA) were recorded during MS and CPT in 28 young, healthy subjects (14 men and 14 women) after normal sleep (NS) and 24-h TSD (randomized, crossover design). Forearm vascular conductance (FVC) was recorded during MS. MAP, FVC, and MSNA (n = 10) responses to MS were not different between NS and TSD (condition × time, P > 0.05). Likewise, MAP and MSNA (n = 6) responses to CPT were not different between NS and TSD (condition × time, P > 0.05). In contrast, increases in HR during both MS and CPT were augmented after TSD (condition × time, P ≤ 0.05), and these augmented HR responses persisted during both recoveries. When analyzed for sex differences, cardiovascular reactivity to MS and CPT was not different between sexes (condition × time × sex, P > 0.05). We conclude that TSD does not significantly alter MAP, MSNA, or forearm vascular responses to MS and CPT. The augmented tachycardia responses during and after both acute stressors provide new insight regarding the emerging links among sleep deprivation, stress, and cardiovascular risk.
Collapse
Affiliation(s)
- Huan Yang
- Department of Kinesiology and Integrative Physiology, Michigan Technological University, Houghton, MI 49931, USA
| | | | | | | | | |
Collapse
|
58
|
Pathogenesis of cognitive dysfunction in patients with obstructive sleep apnea: a hypothesis with emphasis on the nucleus tractus solitarius. SLEEP DISORDERS 2012; 2012:251096. [PMID: 23470865 PMCID: PMC3581091 DOI: 10.1155/2012/251096] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Revised: 12/13/2011] [Accepted: 12/22/2011] [Indexed: 02/06/2023]
Abstract
OSA is characterized by the quintessential triad of intermittent apnea, hypoxia, and hypoxemia due to pharyngeal collapse. This paper highlights the upstream mechanisms that may trigger cognitive decline in OSA. Three interrelated steps underpin cognitive dysfunction in OSA patients. First, several risk factors upregulate peripheral inflammation; these crucial factors promote neuroinflammation, cerebrovascular endothelial dysfunction, and oxidative stress in OSA. Secondly, the neuroinflammation exerts negative impact globally on the CNS, and thirdly, important foci in the neocortex and brainstem are rendered inflamed and dysfunctional. A strong link is known to exist between neuroinflammation and neurodegeneration. A unique perspective delineated here underscores the importance of dysfunctional brainstem nuclei in etiopathogenesis of cognitive decline in OSA patients. Nucleus tractus solitarius (NTS) is the central integration hub for afferents from upper airway (somatosensory/gustatory), respiratory, gastrointestinal, cardiovascular (baroreceptor and chemoreceptor) and other systems. The NTS has an essential role in sympathetic and parasympathetic systems also; it projects to most key brain regions and modulates numerous physiological functions. Inflamed and dysfunctional NTS and other key brainstem nuclei may play a pivotal role in triggering memory and cognitive dysfunction in OSA. Attenuation of upstream factors and amelioration of the NTS dysfunction remain important challenges.
Collapse
|
59
|
Dysfunctional nucleus tractus solitarius: its crucial role in promoting neuropathogenetic cascade of Alzheimer's dementia--a novel hypothesis. Neurochem Res 2012; 37:846-68. [PMID: 22219130 DOI: 10.1007/s11064-011-0680-2] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Revised: 11/16/2011] [Accepted: 12/15/2011] [Indexed: 12/22/2022]
Abstract
The pathophysiological mechanism(s) underlying Alzheimer's disease (AD) still remain unclear, and no disease-modifying or prophylactic therapies are currently available. Unraveling the fundamental neuropathogenesis of AD is an important challenge. Several studies on AD have suggested lesions in a number of CNS areas including the basal forebrain, hippocampus, entorhinal cortex, amygdale/insula, and the locus coeruleus. However, plausible unifying studies on the upstream factors that involve these heterogeneous regions and herald the onset of AD pathogenesis are not available. The current article presents a novel nucleus tractus solitarius (NTS) vector hypothesis that underpins several disparate biological mechanisms and neural circuits, and identifies relevant hallmarks of major presumptive causative factor(s) linked to the NTS, in older/aging individuals. Aging, obesity, infection, sleep apnea, smoking, neuropsychological states, and hypothermia-all activate inflammatory cytokines and oxidative stress. The synergistic impact of systemic proinflammatory mediators activates microglia and promotes neuroinflammation. Acutely, the innate immune response is protective defending against pathogens/toxins; however, when chronic, it causes neuroinflammation and neuronal dysfunction, particularly in brainstem and neocortex. The NTS in the brainstem is an essential multiple signaling hub, and an extremely important central integration site of baroreceptor, chemoreceptor, and a multitude of sensory afferents from gustatory, gastrointestinal, cardiac, pulmonary, and upper airway systems. Owing to persistent neuroinflammation, the dysfunctional NTS exerts deleterious impact on nucleus ambiguus, dorsal motor nucleus of vagus, hypoglossal, parabrachial, locus coeruleus and many key nuclei in the brainstem, and the hippocampus, entorhinal cortex, prefrontal cortex, amygdala, insula, and basal forebrain in the neocortex. The neuronal and synaptic dysfunction emanating from the inflamed NTS may affect its interconnected pathways impacting almost the entire CNS--which is already primed by neuroinflammation, thus promoting cognitive and neuropsychiatric symptoms. The upstream factors discussed here may underpin the neuropathopgenesis of AD. AD pathology is multifactorial; the current perspective underscores the value of attenuating disparate upstream factors--in conjunction with anticholinesterase, anti-inflammatory, immunosuppressive, and anti-oxidant pharmacotherapy. Amelioration of the NTS pathology may be of central importance in countering the neuropathological cascade of AD. The NTS, therefore, may be a potential target of novel therapeutic strategies.
Collapse
|
60
|
Toda N, Nakanishi-Toda M. How mental stress affects endothelial function. Pflugers Arch 2011; 462:779-94. [PMID: 21947555 DOI: 10.1007/s00424-011-1022-6] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2011] [Revised: 08/22/2011] [Accepted: 08/24/2011] [Indexed: 01/23/2023]
Abstract
Mental stress is an important factor contributing to recognized mechanisms underlying cardiovascular events. Among these, stress-related endothelial dysfunction is an early risk factor that predicts future development of severe cardiovascular disorders. Acute mental stress by a variety of tests impairs endothelial function in humans, although the opposite results have been reported by some investigators. Chronic stress always deteriorates endothelial function in humans and experimental animals. Stress hormones, such as glucocorticoids and pro-inflammatory cytokines, and endothelin-1 liberated in response to mental stress participate in endothelial dysfunction possibly via downregulation of endothelial nitric oxide synthase (eNOS) expression, eNOS inactivation, decreased nitric oxide (NO) actions, and increased NO degradation, together with vasoconstriction counteracting against NO-induced vasodilatation. Catecholamines do not directly affect endothelial function but impair its function when blood pressure elevation by the amines is sustained. Endogenous opioids favorably affect endothelial function, which counteract deteriorating effects of other stress hormones and mediators. Inhibition of cortisol and endothelin-1 production, prevention of pro-inflammatory mediator accumulation, hypnotics, mirthful laughter, humor orientation, and lifestyle modification would contribute to the prevention and treatment for stress-related endothelial dysfunction and future serious cardiovascular disease.
Collapse
Affiliation(s)
- Noboru Toda
- Toyama Institute for Cardiovascular Pharmacology Research, 7-13, 1-Chome, Azuchi-machi, Chuo-ku, Osaka 541-0052, Japan.
| | | |
Collapse
|
61
|
Abstract
Obstructive sleep apnea (OSA) is characterized by repetitive apnea-hypopnea cycles during sleep, which are associated with oxygen desaturation and sleep disruption. Up to 30% of the adult population in Western countries are thought to be affected by asymptomatic OSA and approximately 2-4% by symptomatic OSA (also known as obstructive sleep apnea syndrome, or OSAS). Controlled trials have demonstrated that OSAS causes hypertension and prospective epidemiological studies have indicated that OSAS might be an independent risk factor for stroke and myocardial ischemia. Three biological mechanisms are thought to underpin the association of OSA with endothelial dysfunction and arterial disease: intermittent hypoxia leading to increased oxidative stress, systemic inflammation, and sympathetic activity; intrathoracic pressure changes leading to excessive mechanical stress on the heart and large artery walls; and arousal-induced reflex sympathetic activation with resultant repetitive blood-pressure rises. More clinical interventional trials are needed to determine the magnitude of the effect OSA has on cardiovascular damage and to enable a comparison with conventional vascular risk factors.
Collapse
|
62
|
Sandoo A, van Zanten JJCSV, Metsios GS, Carroll D, Kitas GD. The endothelium and its role in regulating vascular tone. Open Cardiovasc Med J 2010; 4:302-12. [PMID: 21339899 PMCID: PMC3040999 DOI: 10.2174/1874192401004010302] [Citation(s) in RCA: 481] [Impact Index Per Article: 34.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2010] [Revised: 11/22/2010] [Accepted: 11/23/2010] [Indexed: 12/16/2022] Open
Abstract
The endothelium forms an important part of the vasculature and is involved in promoting an atheroprotective environment via the complementary actions of endothelial cell-derived vasoactive factors. Disruption of vascular homeostasis can lead to the development of endothelial dysfunction which in turn contributes to the early and late stages of atherosclerosis. In recent years an increasing number of non-invasive vascular tests have been developed to assess vascular structure and function in different clinical populations. The present review aims to provide an insight into the anatomy of the vasculature as well as the underlying endothelial cell physiology. In addition, an in-depth overview of the current methods used to assess vascular function and structure is provided as well as their link to certain clinical populations.
Collapse
Affiliation(s)
- Aamer Sandoo
- School of Sport and Exercise Sciences, University of Birmingham, Birmingham, West Midlands, United Kingdom
| | | | | | | | | |
Collapse
|
63
|
Kim J, Jo I. Age-dependent association between sleep duration and hypertension in the adult Korean population. Am J Hypertens 2010; 23:1286-91. [PMID: 20706198 DOI: 10.1038/ajh.2010.166] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND In Western countries, sleep deprivation has been reported to elevate blood pressure. Here, we examined whether this association is true also for an Asian population. METHODS The study sample comprised 5,393 Korean adults aged 19-99 years who had participated in the 2005 Korean National Health and Nutrition Examination Survey. Hypertension was defined as a systolic blood pressure (SBP) ≥140 mm Hg or a diastolic blood pressure (DBP) ≥90 mm Hg, or regular use of antihypertensive medication. RESULTS Among the participants, 1,345 subjects (24.9%) displayed hypertension. The median sleep duration was 7 h/day. In the young and middle-aged adults aged <65 years, the unadjusted odds ratio (OR) for hypertension was 1.5-fold greater in those with a sleep duration of ≤5 h (OR 1.52; 95% confidence interval (CI) 1.19, 1.94) as compared to those who slept 7 h. This trend did not significantly change after adjustments for putative risk factors for hypertension such as gender, obesity, smoking status, alcohol consumption, physical activity, depressive symptom, diabetes mellitus, and stroke (OR 1.31; 95% CI 1.01, 1.71). However, in the older adults aged ≥65 years, no association was found between sleep duration and the risk of hypertension. Long sleep duration (≥8 h) was not associated with hypertension in either the younger or older adults in this study. CONCLUSION Short sleep duration (≤5 h) is independently associated with hypertension in young and middle-aged Korean adults.
Collapse
|
64
|
Jones ID, Fuentes VL, Fray TR, Vallance C, Elliott J. Evaluation of a flow-mediated vasodilation measurement technique in healthy dogs. Am J Vet Res 2010; 71:1154-61. [DOI: 10.2460/ajvr.71.10.1154] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
65
|
Scientific Opinion on the substantiation of health claims related to magnesium and “hormonal health” (ID 243), reduction of tiredness and fatigue (ID 244), contribution to normal psychological functions (ID 245, 246), maintenance of normal blood glucose c. EFSA J 2010. [DOI: 10.2903/j.efsa.2010.1807] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
|
66
|
Heyman A, Lavalle JB, Hawkins EB, Edwards L. An integrative medicine approach to managing nutrient depletions in the cardiometabolic patient. JOURNAL OF MEN'S HEALTH 2010. [DOI: 10.1016/j.jomh.2010.01.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
67
|
Inflammation accelerates atherosclerotic processes in obstructive sleep apnea syndrome (OSAS). Sleep Breath 2010; 14:261-9. [DOI: 10.1007/s11325-010-0338-3] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2009] [Revised: 01/26/2010] [Accepted: 01/31/2010] [Indexed: 10/19/2022]
|
68
|
Independent association of drug-resistant hypertension to reduced sleep duration and efficiency. Am J Hypertens 2010; 23:174-9. [PMID: 19927130 DOI: 10.1038/ajh.2009.220] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Experimentally induced sleep deprivation can raise blood pressure (BP) and worsen hypertension. We recently reported a significantly higher prevalence of obstructive sleep apnea (OSA) and reduced rapid eye movement (REM) sleep time in drug-resistant hypertensives compared to controlled hypertensives. The objective of this study was to test the hypothesis that short sleep duration is associated with resistant hypertension (RH) independently of OSA, which can itself disrupt and shorten sleep. METHODS In a case-control study, overnight polysomnographic results of subjects with OSA and RH (n = 62) were compared to those with OSA of equal severity and either controlled hypertension (CH) (n = 49) or normotension (n = 40). RESULTS Subjects with RH slept 33.8 min (P = 0.02) and 37.2 min (P = 0.02) less than those with CH and normotension, respectively. Consequently, sleep efficiency was reduced by 7.9% (P = 0.007) and 10.2% (P = 0.002), respectively. They also spent 9.7 min (P = 0.06) and 11.6 min (P = 0.04) less time in REM sleep compared to those with CH and normotension, respectively. Older age, greater body mass index (BMI) and greater apnea-hypopnea index (AHI) were also associated with shorter sleep time (P = 0.02, P = 0.001, and P = 0.03, respectively) and reduced sleep efficiency (P = 0.0003, P = 0.03, and P = 0.01, respectively). CONCLUSIONS Our study demonstrates that, compared to subjects with CH or normotension, those with RH have shorter total and REM sleep times and lower sleep efficiency independently of OSA. These data suggest that reduced sleep time may contribute to the severity of hypertension.
Collapse
|
69
|
Sauvet F, Leftheriotis G, Gomez-Merino D, Langrume C, Drogou C, Van Beers P, Bourrilhon C, Florence G, Chennaoui M. Effect of acute sleep deprivation on vascular function in healthy subjects. J Appl Physiol (1985) 2010; 108:68-75. [DOI: 10.1152/japplphysiol.00851.2009] [Citation(s) in RCA: 160] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Sleep disorders are associated with inflammation and sympathetic activation, which are suspected to induce endothelial dysfunction, a key factor in the increased risk of cardiovascular disease. Less is known about the early effects of acute sleep deprivation on vascular function. We evaluated microvascular reactivity and biological markers of endothelial activation during continuous 40 h of total sleep deprivation (TSD) in 12 healthy men (29 ± 3 yr). The days before [ day 1 (D1)] and during TSD (D3), at 1200 and 1800, endothelium-dependent and -independent cutaneous vascular conductance was assessed by iontophoresis of acetylcholine and sodium nitroprusside, respectively, coupled to laser-Doppler flowmetry. At 0900, 1200, 1500, and 1800, heart rate (HR) and instantaneous blood pressure (BP) were recorded in the supine position. At D1, D3, and the day after one night of sleep recovery (D4), markers of vascular endothelial cell activation, including soluble intercellular adhesion molecule-1, vascular cell adhesion molecule-1, E-selectin, and interleukin-6 were measured from blood samples at 0800. Compared with D1, plasma levels of E-selectin were raised at D3, whereas intercellular adhesion molecule-1 and interleukin-6 were raised at D4 ( P < 0.05). The endothelium-dependent and -independent CVC were significantly decreased after 29 h of TSD ( P < 0.05). By contrast, HR, systolic BP, and the normalized low-frequency component of HR variability (0.04–0.15 Hz), a marker of the sympathetic activity, increased significantly within 32 h of TSD ( P < 0.05). In conclusion, acute exposure to 40 h of TSD appears to cause vascular dysfunction before the increase in sympathetic activity and systolic BP.
Collapse
Affiliation(s)
- Fabien Sauvet
- Institut de Recherche Biomédicale des Armées, Département des Environnements Opérationnels, Brétigny sur Orge; and
| | - Georges Leftheriotis
- Université d'Angers, Unité Mixte Centre National de la Recherche Scientifique 6214-Institut National de la Santé et de la Recherche Médicale 771, Angers, France
| | - Danièlle Gomez-Merino
- Institut de Recherche Biomédicale des Armées, Département des Environnements Opérationnels, Brétigny sur Orge; and
| | - Christophe Langrume
- Institut de Recherche Biomédicale des Armées, Département des Environnements Opérationnels, Brétigny sur Orge; and
| | - Catherine Drogou
- Institut de Recherche Biomédicale des Armées, Département des Environnements Opérationnels, Brétigny sur Orge; and
| | - Pascal Van Beers
- Institut de Recherche Biomédicale des Armées, Département des Environnements Opérationnels, Brétigny sur Orge; and
| | - Cyprien Bourrilhon
- Institut de Recherche Biomédicale des Armées, Département des Environnements Opérationnels, Brétigny sur Orge; and
| | - Geneviève Florence
- Institut de Recherche Biomédicale des Armées, Département des Environnements Opérationnels, Brétigny sur Orge; and
| | - Mounir Chennaoui
- Institut de Recherche Biomédicale des Armées, Département des Environnements Opérationnels, Brétigny sur Orge; and
| |
Collapse
|
70
|
Abstract
Endothelial activation and inflammation are important mediators of accelerated atherogenesis and consequent increased cardiovascular morbidity in obstructive sleep apnea (OSA). Repetitive episodes of hypoxia/reoxygenation associated with transient cessation of breathing during sleep in OSA resemble ischemia/reperfusion injury and may be the main culprit underlying endothelial dysfunction in OSA. Additional factors such as repetitive arousals resulting in sleep fragmentation and deprivation and individual genetic suseptibility to vascular manifestations of OSA contribute to impaired endothelial function in OSA. The present review focuses on possible mechanisms that underlie endothelial activation and inflammation in OSA.
Collapse
Affiliation(s)
- Amy Atkeson
- Division of Pulmonary, Allergy, and Critical Care Medicine, Columbia University College of Physicians and Surgeons, 630 West 168th Street, New York, NY 10032, USA
| | | |
Collapse
|
71
|
Abstract
Untreated obstructive sleep apnea (OSA) is an independent risk factor for hypertension, myocardial infarction, and stroke. The repetitive hypoxia/reoxygenation and sleep fragmentation associated with OSA impair endothelial function. Endothelial dysfunction, in turn, may mediate increased risk for cardiovascular diseases. Specifically, in OSA, endothelial nitric oxide availability and repair capacity are reduced, whereas oxidative stress and inflammation are enhanced. Treatment of OSA improves endothelial vasomotor tone and reduces inflammation. We review the evidence and possible mechanisms of endothelial dysfunction as well as the effect of treatment on endothelial function in OSA.
Collapse
Affiliation(s)
- Amy Atkeson
- Division of Pulmonary, Allergy, and Critical Care Medicine, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA
| | | | | | | |
Collapse
|
72
|
Teng WF, Sun WM, Shi LF, Hou DD, Liu H. Effects of restraint stress on iron, zinc, calcium, and magnesium whole blood levels in mice. Biol Trace Elem Res 2008; 121:243-8. [PMID: 17952382 DOI: 10.1007/s12011-007-8047-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2007] [Revised: 09/11/2007] [Accepted: 10/01/2007] [Indexed: 10/22/2022]
Abstract
OBJECTIVE Study the effects of acute and chronic restraint stress on the whole blood concentrations of iron (Fe), zinc (Zn), calcium (Ca), and magnesium (Mg) in mice. MATERIALS AND METHODS Single or repeat restraints were applied to mice to induce acute or chronic stress. The levels of elements in whole blood were determined by flame atomic absorption spectrometry. RESULTS The levels of Fe, Zn, Ca, and Mg in blood in the acute-stress group were 351, 5.05, 60, and 44 microg/ml, respectively, and those in the corresponding control group were 391, 5.90, 59, and 45 microg/ml, respectively. The levels of blood Fe, Zn, Ca, and Mg in the chronic-stress group were 291, 3.62, 59, and 40 microg/ml, respectively, and those in the corresponding control group were 393, 4.82, 48, and 43 microg/ml, respectively. The levels of Fe and Zn in the blood of both the acute-stress and the chronic-stress groups were significantly lower (P < 0.05) than that in the control groups. The Ca level in whole blood was significantly (P < 0.05) higher in the chronic-stress group than that in the control group. CONCLUSION Acute and chronic restraint stress can cause changes in blood levels of Fe and Zn in mice.
Collapse
Affiliation(s)
- Wen-feng Teng
- College of Medical Laboratory, Dalian Medical University, Dalian, China
| | | | | | | | | |
Collapse
|
73
|
|