Search Results
Results 351 - 400 of 767
< 3 4 5 6 7 8 9 10 11 12 13 >
Sardella Brian A - - 2004
The salinity tolerance of the 'California' Mozambique tilapia (Oreochromis mossambicus x O. urolepis hornorum), a current inhabitant of the hypersaline Salton Sea in California, USA, was investigated to identify osmoregulatory stress indicators for possible use in developing a model of salinity tolerance. Seawater-acclimated (35 g l(-1)) tilapia hybrids were exposed ...
Dabelic Sanja - - 2004
Numerous pathological conditions are associated with specific changes in glycosylation. Recent studies clearly demonstrated a link between stress and the development and course of many diseases. Biochemical mechanisms that link stress and diseases are still not fully understood, but there are some indications that changes in glycosylation are involved in ...
Serido Joyce - - 2004
Using daily telephone interviews of a U.S. national sample of adults, aged 25-74 (N = 1,031), the present analyses draw from theories of the stress process and recent research to examine how chronic role-related stressors and daily hassles affect psychological distress. Four separate hypotheses are examined. The first explores the ...
Lutgendorf Susan K - - 2004
Effects of three experimental manipulations: mental stress, relaxation, and a nociceptive inflammatory stimulus, capsaicin, on levels of interleukin-6 (IL-6) were examined. Fifty subjects were pre-trained in relaxation and then randomized to a stress (Stroop test), relaxation (tape), or control (video) manipulation. Subjects participated in an evening reactivity session including 20 ...
Hu X Q - - 2004
In metal on metal hip prostheses, the contact mechanics can influence the lubrication and wear rate. In particular, during the bedding-in wear, the contact area gradually increases to an optimal value, and the wear rate reduces as the contact stress reduces and the lubrication conditions improve. Geometrical designs that reduce ...
Keltikangas-Järvinen Liisa - - 2004
The associations between vital exhaustion (long-term stress), temperament, and cardiac reactivity were studied during an experimentally induced stress in a sample of 76 healthy subjects. Vital exhaustion was assessed with the Maastricht Questionnaire(MQ), and temperament with Cloninger's Temperament and Character Inventory (TCI). Cardiac reactivity was measured in terms of heart ...
Sackner Marvin A - - 2004
Increased shear stress to the endothelium increases activity of endothelial nitric oxide synthase (eNOS) with subsequent release of small quantities (nMol) of nitric oxide (NO) into the circulation. It occurs during moderate aerobic exercise mostly as a result of laminar shear stress and with whole body, periodic acceleration as a ...
Adlard P A - - 2004
Exercise is increasingly recognized as an intervention that can reduce CNS dysfunctions such as cognitive decline, depression and stress. Previously we have demonstrated that brain-derived neurotrophic factor (BDNF) is increased in the hippocampus following exercise. In this study we tested the hypothesis that exercise can counteract a reduction in hippocampal ...
Warith M A - - 2004
The suitability of shredded tires or "tire chips" for use in the leachate collection drainage layer of a municipal solid waste landfill was investigated in terms of the: (1) compressibility of the tire chips and resulting changes in hydraulic conductivity under varying applied loads, and (2) effect of leachate pH ...
Adamec Robert E - - 2003
Electrophysiological studies in cats and recently in rats implicate neuroplasticity in the periaqueductal gray (PAG) and its afferents in stressor-induced increases in fearful behavior and anxiety-like behavior (ALB). Such increases may model aspects of affective changes following traumatic stress in humans. The present study explored the role of neuroplasticity in ...
Trimmel Michael - - 2003
System response time (SRT) is suspected to be a stress-inducing factor when searching for information during human-computer interactions. In this study 26 volunteers, grouped into skilled and unskilled Internet users, completed three tasks of searching for information on the Internet, whereupon they rated their strain. Heart rate, nonspecific skin conductance ...
Ballarin Loriano - - 2003
The clam Chamelea gallina is fairly common along the western coastline of the Adriatic Sea, where it is subjected to intense fishing. To evaluate possible causes of stress in clam populations, the effects of acute mechanical disturbance on haemocyte functionality were analysed in both laboratory and field experiments. Among the ...
Peckerman Arnold - - 2003
Abnormal cardiovascular stress responses have been reported in Gulf War veterans with chronic fatigue. However, many of these veterans also suffer from posttraumatic stress disorder (PTSD), which could potentially explain the reported abnormalities. To test this hypothesis, 55 Gulf veterans (GVs) with chronic fatigue syndrome (CFS) or idiopathic chronic fatigue ...
Henzlova Milena J - - 2003
BACKGROUND: Left ventricular systolic function, expressed as ejection fraction (LVEF), is an important determinant of prognosis for cardiac disease, and is the basis for therapeutic decisions. Several imaging modalities are used for measuring LVEF. All require time, appropriate technology and professional attention, and most expose patients to small doses of ...
Rohleder Nicolas - - 2003
The hypothalamus pituitary adrenal (HPA)- axis is one of the major output systems of the neuroendocrine stress response. Its major end products, glucocorticoids (GCs), have a plethora of effects throughout the organism, most of which are believed to be protective against disturbances of homeostasis. However, negative effects have also been ...
Roemmich James N - - 2003
OBJECTIVE: To determine whether interpersonal stress reduces youths' motivation to exercise in a laboratory setting. RESEARCH METHODS AND PROCEDURES: Physical activity and sedentary behavior were measured in boys and girls across a control day, after reading children's magazines, and on a stress day, after giving a videotaped speech. For one ...
Pawlow L A LA Department of Psychiatry and Behavioral Sciences, Weight Management Center, Medical University of South Carolina, Charleston, SC, - - 2003
Night eating syndrome (NES) is characterized by a lack of appetite in the morning, consumption of 50% or more of daily food intake after 6:00 p.m., and difficulty falling and/or staying asleep. It has been associated with stress and with poor results at attempts to lose weight. The purpose of ...
Cheng Christopher P - - 2003
The prevalence of atherosclerosis in the abdominal aorta increases with age and is hypothesized to be related to adverse hemodynamic conditions including flow recirculation and low wall shear stress. Exercise has been shown to modulate these adverse conditions observed in the infrarenal aorta of healthy young subjects at rest. A ...
Gilles Bruno - - 2003
We study sound propagation in a triangular lattice of spherical beads under isotropic stress. Polydispersity of real beads breaks some contacts, creating a disordered lattice of contacting beads. At large stress, the sound velocity behaves according to Hertz contact law and departs from it at lower stress. This evolution is ...
Iwado Y - - 2003
In ischaemic heart disease patients, transient left ventricular dysfunction is observed due to post-exercise stunning. The aim of this study was to determine whether transient left ventricular dysfunction could also be seen after short-acting pharmacological stress (adenosine triphosphate). A 1 day rest/stress gated myocardial single photon emission computed tomography was ...
Sluiter J K - - 2003
BACKGROUND: Although repetitive exposure to stressful situations is thought to habituate the physical stress responses, work stress is experienced by medical personnel in emergency and intensive care units; performance should, however, remain stable over time. AIMS: To investigate the neuroendocrine reactions (reactivity during and recovery after work) in experienced emergency ...
Bass Bernard M - - 2003
How do leadership ratings collected from units operating under stable conditions predict subsequent performance of those units operating under high stress and uncertainty? To examine this question, the authors calculated the predictive relationships for the transformational and transactional leadership of 72 light infantry rifle platoon leaders for ratings of unit ...
Ballerini A - - 2003
Previous studies on the oxidative stress in swine indicated a strong link between the values of reactive oxygen metabolites (ROMs), the subsequent antioxidant adaptive response (OXY) and the genetic selection. Such findings, mainly related to a cardiovascular inadequacy in lean, large muscle blocks and fast growing breeds, is associated with ...
Van De Water G - - 2003
The objective of this study was to evaluate the heart rate, body temperature, saliva cortisol levels and behaviour of young calves during transport simulation, and to define comfort conditions for calves related to the frequency and acceleration of vibration. Calves with an average age of 22 days were vibrated in ...
Love Oliver P - - 2003
We investigated post-natal development of the adrenocortical stress-response system in captive American kestrels (Falco sparverius) by measurements of baseline and stress-induced levels of corticosterone at ages 10, 16, 22, and 28 days post-hatching. Baseline levels of corticosterone increased significantly during post-natal development and although chicks aged 10- and 16-days old ...
Wyss Christophe A - - 2003
PET allows absolute measurements of myocardial blood flow (MBF). The aim of the present study was to evaluate the feasibility and repeatability of supine bicycle exercise stress, compared with standard adenosine stress, in PET. METHODS: In 11 healthy volunteers, MBF was assessed at rest, during adenosine-induced (140 microg/kg/min over 7 ...
Wilson Timothy D - - 2003
Previous experiments have shown that the vestibular system participates in cardiovascular control. However, the effects of vestibular activation on cerebrovascular regulation are not known. Therefore, the present experiment tested the hypothesis that specific vestibular activations may be beneficial to cerebral circulation during simulated orthostatic stress. Middle cerebral artery blood flow ...
Benni Paul B - - 2003
Pilots commonly experience decreased peripheral vision, confusion & disorientation, and/or unconsciousness when exposed to high +Gz acceleration. We correlated NIRS determined delta Hb, delta HbO2, and delta TotalHb with the resultant +Gz stress symptoms that subjects reported after experiencing a 6 to 10 +Gz amplitude pulse. During the hyperemic response ...
Cheng Christopher P - - 2003
Biologic variations between men and women have been hypothesized to contribute to the differences in atherosclerosis epidemiology of the two genders. Hemodynamics are also hypothesized to play an important role in the localization of atherosclerosis in the abdominal aorta. However, the hemodynamics of men and women have not been compared ...
Ortega Eduardo - - 2003
Neuroendocrine mediation of the effects of exercise on macrophage and neutrophil phagocytosis, the organism's first line of defense against external aggression, is reviewed. Exercise modulates the immune system via the actions of "stress hormones". Although stress had long been regarded as generally immunosuppressive, it is now accepted that this is ...
Rozman Karl K - - 2003
The notion of hormesis has undergone numerous modifications in the course of the 20th century. Because of its unfortunate association with homeopathy, hormesis did not gain acceptance among biomedical professionals. The lack of a plausible mechanism for its occurrence may have contributed much to the rejection of this concept. This ...
Cheng Christopher P - - 2003
Compared with the abdominal aorta, the hemodynamic environment in the inferior vena cava (IVC) is not well described. With the use of cine phase-contrast magnetic resonance imaging (MRI) and a custom MRI-compatible cycle in an open magnet, we quantified mean blood flow rate, wall shear stress, and cross-sectional lumen area ...
Sunsern Rachanee - - 2002
Several researchers have investigated the impact of menopause on American and European women. Yet there is little research that has focused on the meaning of this experience in other cultural and ethnic groups. In Thailand, although there is research concerning the physical symptomotology associated with the postmenopausal period, scant data ...
Jedryka-Góral Anna - - 2002
The whole world experiences progress and development, however it is the human being who pays the price in stress--an inevitable part of modern life. When encountering stress, an individual reacts at the level of both the micro- and macroenvironment. Nowadays, stress is defined as a real or interpreted threat to ...
Okamoto Hidemi - - 2002
Urinary output of water-soluble vitamins has been used as an indices for vitamin nutrition. It has been pointed out that the coefficient variance of these values is high, especially for niacin catabolites. Thus, we investigated what kinds of stress affect the catabolism using female subjects. The effects of cold exposure ...
Morgan Charles A CA - - 2002
BACKGROUND: We previously reported that stress-related release of cortisol and neuropeptide-Y (NPY) were significantly and positively associated in U.S. Army soldiers participating in survival training. Furthermore, greater levels of NPY were observed in individuals exhibiting fewer psychologic symptoms of dissociation during stress. This study tested whether these findings would be ...
Vanitallie Theodore B - - 2002
The body's principal adaptive responses to stress stimuli are mediated by an intricate stress system, which includes the hypothalamic-pituitary-adrenocortical (HPA) axis and the sympathoadrenal system (SAS). Dysregulation of the system, caused by the cumulative burden of repetitive or chronic environmental stress challenges (allostatic load) contributes to the development of a ...
McEwen Bruce S - - 2002
Stress is a condition of the mind and a factor in the expression of disease that differs among individuals. In post-traumatic stress disorder (PTSD), traumatic events can create a long-lasting state of physiologic reactivity that amplifies and exacerbates the effects of daily life events. The elevated activities of physiologic systems ...
Nicolaïdis Stylianos - - 2002
"Stress" is being increasingly implicated in the pathogenesis of a variety of psychological and somatic disturbances. Because responses to stress can vary widely, the absence of a suitable, pathophysiologically based taxonomy of stress responses has hindered physicians in their efforts to devise treatments tailored to deal with specific stress-related problems. ...
Yui Kunio - - 2002
The relation between increased sensitivity to stress associated with noradrenergic hyperactivity and dopaminergic changes, and susceptibility to subsequent spontaneous recurrences of methamphetamine (MAP) psychosis (flashbacks) was examined. Plasma monoamine metabolite levels were assayed in 19 flashbackers, of whom 10 experienced a single flashback and 9 exhibited subsequent flashbacks, 18 nonflashbackers ...
Konuklar Gül - - 2002
The effect of continuous steady shear stress (CSSS) on rennet-induced coagulation of milk was studied by measuring the change in viscosity of the system with time. Continuous shear stress (< or =0.5 Pa) applied during coagulation did not counteract the network formation at standard cheese-making conditions. In fact, CSSS of ...
Gruenwald Joerg - - 2002
This 6-month study evaluated a probiotic multivitamin preparation in 42 adult men and women suffering from stress or exhaustion. The preparation was taken daily with breakfast. A psychological-neurologic questionnaire assessed psycho-organic, central vegetative, and somatic discomforts, and a validated list of adjectives was used to indicate the effect of therapy. ...
Schleifer Lawrence M - - 2002
BACKGROUND: There is evidence of a link between job stress and upper extremity work-related musculoskeletal disorders. However, the biobehavioral mechanisms by which psychosocial stress factors contribute to the development of musculoskeletal disorders are uncertain. METHODS: Based on established principles of breathing and job stress and the relevant empirical literatures, a ...
Zhou Zhongyi - - 2002
At least two 1-aminocyclopropane-1-carboxylic acid synthase genes (ACS) are implicated in the submergence response of rice (Oryza sativa). Previously, the OS-ACS5 gene has been shown to be induced during short- as well as long-term complete submergence of seedlings and to be controlled by a balance of gibberellin and abscisic acid ...
Das Manas Kr - - 2002
Juveniles of fish L. rohita and R. rita subjected to a rapid (5 min) sublethal temperature increase from 28 to 35 degrees C showed significant increase in cortisol and decrease in interrenal ascorbic acid. Hypercholesterolemia, hyperglycemia and hyperlactemia were also evident accompanied by increased blood haemoglobin and haematocrit and stable ...
Papousek Ilona - - 2002
OBJECTIVE: In order to evaluate the relevance of individual differences in the regulation of autonomic subsystems to psychosomatic processes, reactivity of the autonomic nervous system to an emotional stressor was related to the occurrence of physical complaints. In contrast to most other studies, the measures were related to the degree ...
Viru Atko - - 2002
In Russia, the free development of scientific ideas was suppressed in 1950 as a result of the actions of the Joint Session of the Academy of Sciences and the Academy of Medical Sciences of the USSR. Hans Selye's theory on the general adaptation syndrome was considered unscientific. From 1956 to ...
Lebedev Valery P - - 2002
It is well known that deficit of endorphins plays an important role in disturbances of human psycho-physiological status. Previously, we revealed that brain endorphinergic structures have quasiresonance characteristics. On the basis of these data, a method of activation of the brain endorphinergic structures by means of noninvasive and rather selective ...
Hernández M D - - 2002
Cultured fish are bound to experience a variety of potentially stressful situations. In principle, stress may be reduced by adapting fish to intense exercise. This article addresses the effects of chase-induced intense exercise training on rainbow trout. Training reduced fish growth and worsened their nutritional use of food, but had ...
Yui K - - 2002
In this study, we examined the relationship between increased sensitivity to stress associated with noradrenergic hyperactivity and dopaminergic changes, and susceptibility to subsequent spontaneous recurrences of methamphetamine (MAP) psychosis (i.e., flashbacks). The subjects were 81 physically healthy females. Plasma monoamine metabolite levels were assayed in: 19 flashbackers, of whom 11 ...
< 3 4 5 6 7 8 9 10 11 12 13 >