Search Results
Results 201 - 250 of 772
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Greenwood Benjamin N - - 2007
Exercise can reduce symptoms of depression and anxiety in humans, but therapeutic effects of exercise in an animal model of stress-related mood disorders have yet to be demonstrated. In the current study, the authors investigated the ability of wheel running to reverse a long-lasting interference with shuttle box escape produced ...
Kane Garvan C - - 2008
BACKGROUND: Stress echocardiography has traditionally been performed under the supervision of physicians. In the last decade, at some institutions, specially trained registered nurses have taken on the task of directly supervising and conducting these stress tests with appropriate physician involvement and assistance. METHODS: The safety of 15,404 stress echocardiograms that ...
Ring Christopher - - 2008
Hematocrit has been implicated in the triggering of cardiovascular events and the development of cardiovascular disease. Studies have demonstrated the reliability of hematocrit at rest, however, data are lacking about hematocrit during repeated acute stress exposures. The current study assessed the reliability of hematocrit during rest and stress. Hematocrit was ...
Thoeringer Christoph K - - 2007
The multidrug-resistance gene 1-type p-glycoprotein (MDR1 p-gp) is a major gate-keeper at the blood-brain barrier (BBB), protecting the central nervous system from accumulation of toxic xenobiotics and drugs. In addition, MDR1 p-gp has been found to control the intracerebral access of glucocorticoid hormones and thus to modulate the activity of ...
Simeon Daphne - - 2007
Mature defenses comprise one well-validated indicator of resilience. We investigated the relationships of resilience to trauma, attachment, temperament, cortisol, and cognitive performance in adult healthy volunteers. Participants were administered the Defense Style Questionnaire; the Relationship Questionnaire; the Childhood Trauma Questionnaire, and the Tridimensional Personality Questionnaire. Cortisol determinations included 24-h urinary, ...
Vasconcelos Filho José Osmar - - 2007
BACKGROUND: The authors conducted a study in subjects who tested free of psychological stress to determine the position of the condyle and whether that position was related to signs and symptoms of temporomandibular disorders (TMDs). METHODS: Forty subjects underwent psychological evaluation to ensure freedom from psychological stress. The authors evaluated ...
Murlasits Zsolt - - 2007
PURPOSE: Both short-term (three to five consecutive days) and long-term (weeks to months) endurance exercise training provides cardioprotection against ischemia-reperfusion (IR)-induced injury. However, the mechanisms responsible for exercise-induced cardioprotection are not well understood. Emerging evidence indicates that endoplasmic reticulum (ER) damage contributes to IR-induced myocardial injury. It follows that exercise-induced ...
Hamer Mark - - 2007
OBJECTIVES: To examine the association between physical fitness, cardiac parasympathetic control, and inflammatory cytokine responses to mental stress. Exercise and physical fitness may act as a buffer to the detrimental effects of psychosocial stress exposure. METHODS: Participants were 207 men and women (52 +/- 3 years) drawn from the Whitehall ...
Cunha Leonardo G - - 2008
OBJECTIVES: The objective of this study was to verify the influence of curing methods on contraction stress, stress rate and degree of conversion (DC) of a restorative composite at two C-factor levels. METHODS: For the stress test, composite was applied between two for 15 min from diameter glass rods mounted ...
Mayorov Dmitry N - - 2007
Nitric oxide (NO) has been critically implicated in the central regulation of autonomic function. We recently found, however, that acute (up to 30min) blockade of NO synthase (NOS) in the rostral ventrolateral medulla (RVLM) inhibited sympathetic baroreflex transmission, without altering the cardiovascular response to psychological (air-jet) stress in rabbits. In ...
Paredes Sergio D - - 2007
Corticosterone is thought to be the main glucocorticoid secreted in response to stressful exercise, while melatonin buffers the adverse immunological effects of stress. The present work was aimed to evaluate whether swimming-exercise-induced stress leads to changes in the chronobiology parameters of the circadian rhythms of melatonin and corticosterone, and in ...
Saridomichelakis Manolis N - - 2007
In canine leishmaniosis, the parasitic density of the skin may be important for the infection of sandflies, and increased accumulation of inflammatory cells infected with Leishmania is believed to occur in dermal areas subjected to mechanical trauma. Parasite density and inflammatory responses in the upper and lower dermis of three ...
Storch Maja - - 2007
OBJECTIVE: The stress-induced release of cortisol has been linked to detrimental health outcomes. Therefore, strategies to attenuate cortisol stress responses are of interest for prevention and treatment of stress-related symptoms and problems. Previous studies have found protective effects of cognitive-behavioral stress management training--which focuses on the modification of stress-inducing cognitions--on ...
Andrássy Gábor - - 2007
BACKGROUND: The effects of active and passive mental stress (PMS) on the QT interval were studied by using an intraindividual regression method of QT-interval correction for heart rate. METHODS: Thirty healthy males (age 21.2 +/- 1.8 years) performed a mental arithmetic for 1 minute, which was considered as active mental ...
Neves Mirna A - - 2007
The well productivity in crystalline terrains is extremely changeable and depends on external factors, in addition to the intrinsic properties of rocks. In the Jundiaí River Catchment, Southeastern Brazil, the main factor that influences well productivity is the existence of open discontinuities permeability in geologic environments that favor groundwater recharge. ...
Sciagrà Roberto - - 2007
BACKGROUND: Gated single photon emission computed tomography (SPECT) identifies functional changes produced by ischemia, but the influence of acquisition delay on their detection is not established. METHODS AND RESULTS: In 80 patients with known or suspected coronary artery disease, gated SPECT was acquired twice: first, less than 30 minutes after ...
Mulpuru Siva K - - 2007
Preexcitation syndromes pose a diagnostic challenge for exercise stress testing. We present stress echocardiographic findings in patient with Wolff-Parkinson-White (WPW) pattern on surface electrocardiogram (EKG). Echocardiogram at rest demonstrated paradoxical septal motion which disappeared during peak exercise and reappeared during rest. Preexcitation pattern on EKG also disappeared at peak stress. ...
Huber Michaell A - - 2007
Intrinsic and extrinsic physiological stressors (physical, metabolic, or psychological) are constantly challenging the body's homeostatic mechanisms. Regardless of their nature, the body will initiate a series of autonomic responses in an effort to maintain homeostasis. For example, to cope with a perceived threat, cardiac output and respiration are increased, the ...
Warburton Darren E R - - 2007
In this paper we introduce 3 papers resulting from a symposium evaluating cardiac function across the health spectrum under varied conditions of physiological stress. Esch et al. (Appl. Physiol. Nutr. Metab. 32: this issue) evaluate the potential role the pericardium plays on diastolic filling in endurance-trained athletes. These authors reveal ...
Loft Patricia - - 2007
The present study examined how cardiovascular and salivary cortisol responses varied in response to an acute challenge in medical students under exam stress versus those not under exam stress. One hundred and twenty-nine medical students were randomly assigned to undertake a CO2 inhalation test either prior to an examination period ...
Barja Isabel - - 2007
The tourist pressure in natural parks is a potential source of stress and may cause an increase in the adrenal activity of wild populations of European pine marten (Martes martes). Seventy-six faecal samples were collected during 15 months in a natural park of Northwest Spain. Analysis of faecal DNA was ...
Zeiner Heinz - - 2007
This survey focusses on the effects of various claw trimming methods as well as the effect of the different resulting claw shapes on the pressure distribution under the sole. 64 bovine claws were trimmed according to 3 different trimming methods, the functional claw trimming method by Toussaint Raven and two ...
Haussmann Mark F - - 2007
Perceived stress activates the hypothalamus-pituitary-adrenal axis, resulting in the release of glucocorticoids into the systemic circulation. Glucocorticoids cause the elevation of blood glucose, providing the necessary energy for the organism to cope with stress. Here, we outline a laboratory exercise that uses a competitive ELISA kit to illustrate the response ...
Tahara Yasuaki - - 2007
PURPOSE: The purpose of this study was to investigate the effects of chewing and clenching on salivary cortisol levels as an indicator of stress. MATERIALS AND METHODS: Seventeen healthy dentulous subjects were given arithmetic exercises to perform within a 20-minute time limit in order to elicit stress (stress loading). In ...
Heruti Rafi J - - 2007
INTRODUCTION: Although erectile dysfunction (ED) might be associated with coronary heart disease (CHD), there is no evidence it predicts poor cardiovascular prognosis. On the other hand, an abnormal heart rate profile during exercise stress testing predicts poor cardiovascular prognosis in high-risk patients, such as diabetic men, even in the absence ...
Caton Trace T Division of Otolaryngology-Head and Neck Surgery, The University of Utah, Salt Lake City, Utah, - - 2007
The purpose of this study was to measure and compare biomechanical properties of commonly used vocal fold injectates Cymetra, Radiesse, Restylane, Hylaform, and one investigational injectate, Carbylan-GSX 5%, to determine suitability for mucosal injection. Rheologic investigation. Oscillatory shear stress was applied to five samples of each injectate using a parallel ...
Bas Firdevs - - 2007
BACKGROUND: It is known that arginine vasopressin (AVP) has a stimulatory effect on corticotropin (adrenocorticotropic hormone; ACTH) and cortisol secretion especially during stress. The present study was designed to investigate the effect of stress on ACTH and cortisol levels in patients with central diabetes insipidus (DI) with endogenous AVP deficiency ...
Tejeda-Vera Ricardo - - 2007
Pollution of water bodies causes stress on organisms inhabiting them. Determination of biomarkers and bioindicators on fish populations reflects whether they are subject to stress. We assessed two populations of Ameca splendens and Goodea atripinnis in a reference site (spring "El Rincon") and De La Vega reservoir, which receives wastewater ...
Cotrim Carlos - - 2007
The authors report the case of a 16-year-old boy who practices karate, who underwent medical evaluation because of atypical chest discomfort, related to strenuous effort. The ECG and echocardiogram findings were normal. The young boy did a treadmill stress test which was positive for myocardial ischemia. Late during the investigation, ...
Kotwicki Tomasz - - 2007
BACKGROUND: Adolescent girls treated with a brace for scoliosis are submitted to prolonged stress related to both the disease and the therapy. Currently proposed quality of life questionnaires are focused on the outcome of therapy. Bad Sobernheim Stress Questionnaire (BSSQ) enables monitoring of patients being under treatment with a brace ...
Khanafer Khalil M - - 2007
The numerical models of abdominal aortic aneurysm (AAA) in use do not take into account the non-Newtonian behavior of blood and the development of local turbulence. This study examines the influence of pulsatile, turbulent, non-Newtonian flow on fluid shear stresses and pressure changes under rest and exercise conditions. We numerically ...
Phillips Anna C - - 2007
Age-related immunological and endocrinological changes may have implications for resilience to stress in older adults. We hypothesize that the combination of adrenopause and immunosenescence may leave this population particularly vulnerable to the negative effects of stress on immunity. We propose that exercise may be an effective intervention to limit the ...
Lee Jeong-Mi - - 2007
Differences in the cardiovascular responses of individuals with behavior patterns of Type A and Type B were investigated during rest, stress, and recovery by visual stimulation. Thirty healthy undergraduate and graduate students (mean age: 22.18+/-1.44 years) were categorized as Type A (N=14), or Type B (N=16) based on the Kwansei ...
König Daniel - - 2007
Increased concentrations of biomarkers reflecting myocardial stress such as cardiac troponin I and T and brain natriuretic peptide (BNP) have been observed following strenuous, long-lasting endurance exercise. The pathophysiological mechanisms are still not fully elucidated and the interpretations of increased post-exercise concentrations range from (i) evidence for exercise-induced myocardial damage ...
Hasnulin V I - - 2007
It was shown that frequent geomagnetic perturbations and also meteorological, climatic, photoperiodic, and gravitational changes in high latitudes are the main cause for human chronic stress in the North Free-radical damage of cellar and subcellar membranes (oxidative stress), disturbance of ferments' functions and changes in metabolism, connected with it; decrease ...
von Känel R - - 2007
We studied the psychophysiology of soluble intercellular adhesion molecule-1 (sICAM-1) in 25 apparently healthy middle-aged men who underwent an acute psychosocial stressor three times with one week apart. Measures of the biological stress response were obtained at week one and three. The magnitude of the sICAM-1 stress response showed no ...
Heinz Andreas - - 2007
BACKGROUND: A polymorphism of the human serotonin transporter gene (SCL6A4) has been associated with serotonin transporter expression and with processing of aversive stimuli in the amygdala. Functional imaging studies show that during the presentation of aversive versus neutral cues, healthy carriers of the short (s) allele showed stronger amygdala activation ...
Bouget Mikaël - - 2006
In this study, we examined the effect of rapidly increased training volume and intensity on hormonal responses (salivary cortisol [C] and urinary dehydroepiandrosterone sulphate [DHEA-S]) and recovery-stress state perceived by 12 female cyclists. Over the 4-day experimental period, there was an average increase in training load of approximately 122% compared ...
Sáez María Del Carmen Mdel - - 2007
We hypothesized that intense exercise training (forced swimming for 30 min, 5 days/week) may enhance the progression of mammary carcinogenesis through the involvement of stress hormones, such as catecholamines and prolactin, which can promote breast cancer. After the appearance of the DMBA-induced tumors in Sprague-Dawley rats, the effect was evaluated ...
Fletcher Gerald F - - 2006
Exercise stress testing is an important diagnostic tool for the evaluation of suspected or known cardiac disease. In 2002, the American College of Cardiology (ACC) and the American Heart Association (AHA) revised their guidelines for exercise testing. Ten categories from the ACC/ AHA 1997 guidelines were modified: ST heart rate ...
Ong Jason C JC Department of Psychology, Virginia Commonwealth University, Richmond, VA, USA. - - 2006
Despite the advancement of the biopsychosocial model, the interrelationship between behavioral, emotional, and physiological factors in tension-type headache (TTH) remains unclear. Using a picture-viewing paradigm, the present study investigated differences between females with TTH and controls on physiological reactivity, affective valence and arousal, and oral motor habits. In addition, the ...
Tsatsoulis Agathocles - - 2006
The human body, when under threat, elicits a set of neuroendocrine responses, including an increased secretion of glucocorticoids (GCs) and catecholamines from the adrenal gland and the activation of the sympathetic nervous system. These hormonal secretions allow a "fight or flight" response by mobilizing endogenous substrate and inducing a state ...
Oaten Megan - - 2006
OBJECTIVES: The purpose of the present study was to test whether the repeated practice of self-regulation could improve regulatory strength over time. METHOD: Regulatory performance was assessed at baseline, then at monthly intervals for a period of 4 months using a visual tracking task. Perceived stress, emotional distress, self-efficacy and ...
Mastorakos George - - 2006
The hypothalamic-pituitary-adrenal (HPA) axis and the proinflammatory cytokines (and interleukin-6 [IL-6] in particular) are enmeshed in the response to somatic stress, either in health or in acute or chronic disease. Usually IL-6 is elevated in states of septic (such as sepsis) or aseptic inflammation (such as rheumatoid arthritis). Exercise is ...
Hackney Anthony C - - 2006
In this article, the physiological impact of one form of stress - physical exercise - on the neuroendocrine system will be discussed. The specific intent of the review is to present an overview of stress endocrinology, the conceptual models associated with this area of study, and a discourse on the ...
Di Luigi L - - 2006
To evaluate the influence of chronological age and pubertal development on the hypothalamus-pituitary-adrenal (HPA) axis response to stress, we studied the possible correlations between male pubertal characteristics and salivary cortisol (C), DHEAS and the DHEAS/C ratio before (pre-stress) and after acute exercise-stress in young male volunteers (no. 87; 13.3+/-2.1 yr). ...
Hirose Miho - - 2006
In the temporomandibular joint (TMJ), overloading induced by prolonged clenching appears to be important in the cascade of events leading to disc displacement. In this study, the effect of disc displacement on joint stresses during prolonged clenching was studied. For this purpose, finite-element models of the TMJ, with and without ...
Blustein Joshua E - - 2006
Previous studies indicated that intensity level may be a determining factor in the beneficial or detrimental effects of exercise on spatial memory, as chronic low-intensity level exercise appears to enhance learning and memory which stressful situations may impair. This study examines the effects of different intensity levels of acute exercise ...
Kimura Kenta - - 2007
L-Theanine is an amino acid contained in green tea leaves which is known to block the binding of L-glutamic acid to glutamate receptors in the brain. Because the characteristics of L-Theanine suggest that it may influence psychological and physiological states under stress, the present study examined these possible effects in ...
Ohiwa Nao - - 2007
Exercise around the lactate threshold induces a stress response, defined as "running stress." We have previously demonstrated that running stress is associated with activation of certain regions of the brain, e.g., the paraventricular hypothalamic nucleus (PVN) and supraoptic nucleus, that are hypothesized to play an integral role in regulating stress-related ...
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