Search Results
Results 401 - 450 of 1093
< 4 5 6 7 8 9 10 11 12 13 14 >
Crewther Blair - - 2006
The endocrine system plays an important role in strength and power development by mediating the remodelling of muscle protein. Resistance training scheme design regulates muscle protein turnover by modifying the anabolic (testosterone, growth hormone) and catabolic (cortisol) responses to a workout. Although resistance exercise increases the concentrations of insulin-like growth ...
Giton Frank - - 2006
BACKGROUND: Bioavailable testosterone (BT), circulating testosterone not bound to sex hormone-binding globulin (SHBG), is thought to easily penetrate cells. We compared BT measurements obtained by assays with those obtained by calculation with different testosterone association constants. METHODS: We obtained sera from 2 groups of hypogonadal men [group 1 (G1), 1421 ...
Weltman Arthur A Department of Human Services, University of Virginia, Charlottesville, VA 22904, USA. - - 2006
We investigated the joint impact of age, gender, and exercise intensity on growth hormone (GH) secretion. At a university center, nine young men, eight young women, seven older men, and six older women were each tested on six randomly ordered occasions [control (C) and 5 exercise conditions (Ex)]. Serum GH ...
Stokes Keith - - 2006
BACKGROUND: The factors that regulate the growth hormone (GH) response to physiological stimuli, such as exercise, are not fully understood. The aim of the present study is to determine whether age, body composition, measures of sprint performance or the metabolic response to a sprint are predictors of the GH response ...
Eliakim Alon - - 2006
Obesity blunts catecholamine and growth hormone (GH) responses to exercise in adults, but the effect of obesity on these exercise-associated hormonal responses in children is unclear. Therefore, the aim of the present study was to asses the effect of childhood obesity on the counterregulatory hormonal response to acute exercise. Twenty-five ...
Kraemer Robert R - - 2006
Conventional resistance exercise is performed using sequential concentric (CON) and eccentric (ECC) contractions, utilizing the same muscle load. Thus, relative to maximal CON and ECC resistance, the ECC contraction is loaded to a lesser degree. We have recently shown that at the same absolute load, CON contractions are associated with ...
Zaldivar Frank - - 2006
Leukocytosis following exercise is a well-described phenomenon of stress/inflammatory activation in healthy humans. We hypothesized that, despite this increase in circulating inflammatory cells, exercise would paradoxically induce expression of both pro- and anti-inflammatory cytokines and growth factors within these cells. To test this hypothesis, 11 healthy adult men, 18-30 yr ...
Pupim Lara B - - 2005
BACKGROUND: Intradialytic parenteral nutrition (IDPN), with or without exercise, has been shown to reverse the net negative whole-body and forearm muscle protein balances observed during hemodialysis. Pharmacologic doses of recombinant human growth hormone (rhGH) constitute another potential anabolic therapy in chronic hemodialysis patients. OBJECTIVE: Our goal was to examine the ...
Ciloglu Figen - - 2005
BACKGROUND: Physical activity influences energy metabolism in human subjects by increasing activity-induced energy expenditure and resting metabolic rate for several hours after exercise. Effects of exercise on circulating thyroid hormone values remain controversial. We have investigated the effect of acute aerobic exercise on thyroid hormone values. MATERIALS/METHODS: The effect of ...
Fusani L - - 2006
The development of song in songbirds is a complex phenomenon that involves memory and learning, sensorimotor integration, and neural and muscular maturation. Gonadal hormones are involved in each of these steps, as they influence the differentiation of the neural song system, the incorporation and survival of neurones, and the development ...
Hackney A C - - 2006
This study examined the testosterone responses of men to an exercise bout simulating a competitive sporting effort in order to determine if the wearing of red-colored apparel influenced the hormonal response. Male subjects (n = 10) were placed into sets of matched-pairs and performed VO(2max) cycle ergometry exercise test to ...
Ellis C J - - 2005
Nitrogen translocation was measured in Cladonia portentosa during 2 yr growth in Scottish heathland. Translocation was predicted to occur if N is resorbed from senescent basal tissue and recycled within the thallus. (15)N was introduced into either the lower (TU thalli) or upper (TD thalli) 25 mm of 50-mm-long thalli ...
Carter, Rebecca Ann
THYROID STATUS IN EXERCISING HORSES AND LAMINITIC PONIES Rebecca A. Carter (ABSTRACT) The objective of these studies was to contribute to the understanding and assessment of thyroid function in horses. The first study evaluated methods of assessing thyroid function in horses, including validation of an enzyme immunoassay (EIA) for measuring ...
Wee Jamie - - 2005
Exercise is a potent stimulator of growth hormone (GH) secretion. We hypothesised that after a short bout of intense exercise GH may increase lipolysis during recovery. In 7 moderately trained young male subjects (21.8 +/- 0.5 years) and 7 moderately trained older male subjects (56.0 +/- 1.0 years) [(2)H(5)] glycerol ...
Hutson John M - - 2005
Testicular descent occurs in two stages. The transabdominal phase (8-15 weeks) is controlled by enlargement of the caudal genito-inguinal ligament (gubernaculum) and regression of the cranial ligament. Insulin-like 3 from the Leydig cell appears to be the prime stimulator of gubernacular growth, augmented by M?llerian inhibiting substance/anti-M?llerian hormone. Testosterone causes ...
Kanaley J A - - 2005
OBJECTIVE: This study examined the effect of hormone-replacement therapy (HRT) use on the incremental GH response to aerobic exercise in postmenopausal women and established whether racial differences in the GH response were seen at rest and in response to exercise. METHODS: 13 white (n = 6, HRT; n = 7, ...
Brizzi Maurizio - - 2005
BACKGROUND: Most criticism of homeopathy concerns the lack of scientific bases and theoretical models. Fundamental research could make important contributions to our understanding of the mechanisms of action of homeopathic treatments. Plant-based bioassays are suitable for basic research -- lacking the placebo effect and ensuring large data samples for structured ...
De Palo Elio F - - 2006
Understanding the relationship between growth hormone (GH) structure (its molecular fragments) and function via interaction with single or multiple receptors is of particular importance in clinical diagnostics and physiologic biochemistry. Direct and indirect actions of GH are numerous ranging from carbohydrate and lipid metabolism to growth effects at muscle and ...
Mejri S - - 2005
To study the effects of regular football training on basal and exercise induced levels of growth hormone (GH) and insulin-like growth factor (IGF-1), 13 young football players were investigated by a submaximal exercise at the beginning of the sporting season in October (S1), at the middle of the season in ...
Ainbinder Denize - - 2005
Physiological decrease in testosterone levels in men with age causes various changes with clinical significance. Recent testosterone replacement therapy is based mainly on transdermal nonpatch delivery systems. These products have the drawback of application on extremely large areas to achieve required hormone blood levels. The objective of the present study ...
Kanaka-Gantenbein C - - 2005
Thyroid hormones are important regulators of energy metabolism and may influence energy processes during physical exercise. There are controversial results concerning thyroid hormone metabolism during strenuous exercise in adult athletes and only scant data concerning the impact of strenuous exercise on thyroid hormone metabolism in children and adolescents. Although some ...
Elloumi M - - 2005
OBJECTIVE: To investigate the response of the somatotrope axis (insulin-like growth factor-1 (IGF-1), insulin-like growth factor binding protein-3 (IGFBP-3)) to intense exercise in relation to tiredness. METHODS: The study involved 11 rugby players who completed a questionnaire intended to evaluate fitness or, conversely, overtraining and who agreed to plasma samples ...
Collomp K - - 2005
To investigate the impact of acute salbutamol intake on performance and selected hormonal and metabolic variables during supramaximal exercise, 13 recreational male athletes performed two 30-second Wingate tests after either placebo (PLA, lactose) or salbutamol (SAL, 4 mg) oral administration, according to a double-blind and randomized protocol. Blood samples collected ...
Brabant G - - 2005
Exercise exerts heterogeneous effects on TSH secretion. Whereas TSH is rapidly stimulated by physical exercise within minutes, and these effects are well supported by careful experiments, the results of studies concerning intermediate and long-term response of TSH release to exercise remain unclear, and the underlying mechanism for both is still ...
Rogers P A W - - 2005
BACKGROUND: The aim of this study was to quantify blood vessel density (BVD) and immunoreactive vascular endothelial growth factor (VEGF) levels in endometrial biopsies taken from women suffering breakthrough bleeding (BTB) under different exogenous hormonal regimes. METHODS: Endometrial biopsies from women in Melbourne with BTB were divided into four groups: ...
Hambrecht Rainer - - 2005
BACKGROUND: Chronic heart failure (CHF) is associated with progressive muscle atrophy and reduced local expression of insulin-like growth factor I (IGF-I). DESIGN: The present study was designed to test the hypothesis that the local deficiency of IGF-I in the skeletal muscle of patients with CHF would respond to a 6-months ...
Syrotuik Daniel G - - 2005
To examine the effects of elk velvet antler supplementation (EVA) combined with training on resting and exercise-stimulated hormonal response, male (n = 25) and female (n = 21) rowers ingested either EVA (560 mg/d) or placebo (PL) during 10 wk of training. VO(2max), 2000 m rowing time, leg and bench ...
Grossi Giorgio - - 2005
OBJECTIVES: The aim of the present study was to examine the free salivary cortisol response to awakening in men and women reporting low, moderate, and high levels of burnout. METHODS: Twenty-two patients on sick leave due to burnout were compared with 22 working participants with low and 20 working participants ...
Kanaley J A - - 2005
OBJECTIVE: Growth hormone (GH) increases during exercise, but the response of the insulin-like growth factor (IGF) system has not been as definitive. Therefore, we investigated the effect of the exercise-induced GH response on the circulating IGF-system in GH-deficient (GHD) and intact adults. DESIGN: Eight GHD adults were studied on 2 ...
Linnamo Vesa - - 2005
The purpose of this study was to examine acute hormonal and neuromuscular responses in men and women to 3 heavy resistance but clearly different exercise protocols: (a) submaximal heavy resistance exercise (SME), (b) maximal heavy resistance exercise (HRE), and (c) maximal explosive resistance exercise (EE). HRE included 5 sets of ...
Hansen Mette - - 2005
The purpose of this study was to examine the effects of increased fat availability induced by growth hormone (GH) administration on the oxidative metabolism during exercise. Seven well-trained males (age 25 +/- 2 years (mean +/- S.E.M.); peak oxygen consumption : 62 +/- 1 ml min(-1) kg(-1) (completed four randomised ...
Reimer S Brent - - 2005
A 13-year-old 4.6-kg (10.2-lb) neutered male domestic long hair cat was evaluated because of a history of lethargy, exercise intolerance, and ventroflexion of the cervical portion of the vertebral column. After extensive assessment at the Veterinary Teaching Hospital at Michigan State University, the clinical signs were attributed to an aldosterone-secreting ...
Takano Haruhito - - 2005
We investigated the hemodynamic and hormonal responses to a short-term low-intensity resistance exercise (STLIRE) with the reduction of muscle blood flow. Eleven untrained men performed bilateral leg extension exercise under the reduction of muscle blood flow of the proximal end of both legs pressure-applied by a specially designed belt (a ...
Anderson, Elyzabeth A.
Whole body lipid and carbohydrate utilization during moderate intensity exercise was examined in eumenorrheic women using oral contraceptive agents (OCA) (n=10) compared to women who were not using OCA (n=9) during the high and low hormone phases of the menstrual cycle. High hormone phases were considered to be the mid-luteal ...
Goto Kazushige - - 2005
PURPOSE: The purpose of this study was to examine the impact of exercise-induced metabolic stress on hormonal responses and chronic muscular adaptations. METHODS: We compared the acute and long-term effects of an "NR regimen" (no-rest regimen) and those of a "WR regimen" (regimen with rest period within a set). Twenty-six ...
Deuster Patricia A PA MPH, Department of Military and Emergency Medicine, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, Maryland 20814-4799, USA. - - 2005
The hypothalamic-pituitary-adrenal axis (HPA) is restrained by activation of gamma-amino-butyric acid receptors. Alprazolam (APZ) and dehydroepiandrosterone (DHEA) are purported to be gamma-amino-butyric acid agonists and antagonists, respectively. Our objective was to examine the effects of APZ and DHEA alone and in combination on HPA axis activity. This was a double-blind, ...
Stokes Keith - - 2005
This study examined the growth hormone (GH) response to repeated bouts of sprint cycling. Eight healthy men completed three trials consisting of two 30-s sprints on a cycle ergometer separated by either 60 min (Trial A) or 240 min (Trial B) of recovery and a single 30-s sprint carried out ...
Roca Catherine A - - 2005
CONTEXT: Sex-related differences in the stress response are well described in the animal literature but in humans are inconsistent and appear to reflect both the method used to stimulate the hypothalamic-pituitary-adrenal (HPA) axis and the age of the subjects. Sex-related differences in reproductive steroid levels further confound efforts to define ...
Esposito John G - - 2005
Growth hormone (GH) treatment reverses the muscle loss allegedly responsible for diminished aerobic capacity and increased fatigue in patients with HIV-associated wasting. This study examined whether submaximal measures of physical performance can be used as objective measures of the functional impact of GH treatment-induced anabolism. We randomized 27 HIV-positive men ...
Hable Whitney E - - 2005
Previous work has demonstrated that dynamic actin arrays are important for axis establishment and polar growth in the fucoid zygote, Silvetia compressa. Transitions between these arrays are mediated by depolymerization of an existing array and polymerization of a new array. To begin to understand how polymerization of new arrays might ...
Kraemer William J - - 2005
The supplement Cortitrol was formulated to mitigate the cortisol response to physiological and psychological stress. Therefore, the purpose of this study was to examine the effects of Cortitrol on serum cortisol concentrations before, during, and after a high-intensity resistance exercise protocol (EX) and a resting control day (REST). We used ...
Sartorio A - - 2005
To characterise the specific GH responses to repeated bouts of standardised aerobic exercise in amateur competitive cyclists, 6 volunteers (mean age +/- SE: 28.7 +/- 2.3 yr, range: 18-35 yr) performed two consecutive 30-min cycling sessions at 80% of individual maximal oxygen uptake on three occasions with different time interval ...
Minczykowski A - - 2005
OBJECTIVE: There is accumulating evidence that growth hormone (GH) plays an important role in the maintenance of normal cardiac growth and function. Abnormalities in left ventricular diastolic function and impairment of systolic function have also been reported in patients with GHD. In this study, we investigated the effects of 12 ...
Parissis John T - - 2005
OBJECTIVE: Recent experimental and clinical data indicate that abnormal inflammatory and apoptotic processes contribute to the progression of chronic heart failure (CHF). We sought to study the effects of growth hormone (GH) on circulating soluble apoptosis mediators, and to investigate whether these GH-induced anti-apoptotic effects are associated with the reduction ...
Berggren Annika A Department of Clinical Physiology, Sahlgrenska University Hospital, SE-41345 Göteborg, - - 2005
Despite the fact that the use of GH as a doping agent in sports is widespread, little is known about its short-term effects. The objective was to study the effects of GH on exercise capacity. A double-blind, placebo-controlled study was used, with a treatment period of 28 d. Subjects from ...
Giannoulis M G - - 2005
OBJECTIVES: Exercise is a potent physiological stimulus of GH secretion. We hypothesized that exogenous recombinant human growth hormone (rhGH) administration through an increase in GH and IGF-I levels would blunt the GH response to exercise. The aim of the study was to examine and compare the impact of rhGH on ...
Rubin Martyn R - - 2005
PURPOSE: The purpose of this investigation was to examine the influence of resistance training on circulating concentrations of growth hormone binding protein (GHBP) in response to acute heavy resistance exercise. METHODS: Using a cross-sectional experimental design, a group of resistance-trained men (RT, N=9, 7.9+/-1.3 yr resistance training experience) and a ...
Mäestu J - - 2005
AIM: The aim of this study was to investigate the hormonal response at rest and during maximal 2,000 m rowing ergometer test in 12 highly trained male rowers before and after 3 week heavy training, and after 2 week tapering periods. METHODS: Venous blood samples were obtained before, immediately after ...
Porcari John P JP Department of Exercise and Sports Science, University of Wisconsin-La Crosse , - - 2005
We studied the effects of self-administered neuromuscular electrical stimulation (NMES) on changes in strength, endurance, selected anthropometric measures, and subject's perceived shape and satisfaction of the abdominal wall. Twenty-four adults (experimental group) stimulated their abdominals 5 days per week (20-40 minutes per session) for 8 weeks and refrained from engaging ...
Goto Kazushige - - 2005
This study examined the influence of prior endurance exercise on hormonal responses to subsequent resistance exercise. Ten males exercised on a cycle ergometer at 50% of maximal oxygen uptake for 60 min and subsequently completed a resistance exercise (bench and leg press, four sets at ten repetitions maximum with an ...
< 4 5 6 7 8 9 10 11 12 13 14 >