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Results 351 - 400 of 1067
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Saugy M - - 2006
Recombinant human growth hormone (rhGH) has been on the list of forbidden substances since availability of its recombinant form improved in the early 1990s. Although its effectiveness in enhancing physical performance is still unproved, the compound is likely used for its potential anabolic effect on the muscle growth, and also ...
Galassetti Pietro - - 2006
Exercise-induced growth hormone (GH) secretion may significantly modulate growth and development in children. Altered physiological GH responses, therefore, may reduce the beneficial effects of exercise. High-fat food ingestion before exercise blunts the GH response in adults, but it is unknown whether this occurs in children. We therefore performed standard exercise ...
Hackney A C - - 2006
The purpose was to determine the day-to-day variability of total testosterone (tT), total T4 (tT4), total 3,5,3'-T3 (tT3), and cortisol (C) levels in exercise-trained men [no.=63, 24+/-4 yr (X+/-SD)]. Resting blood samples were collected at the same time of day (morning) over 3 consecutive days, 24 h apart, under controlled ...
Czarkowska-Paczek B - - 2006
Strenuous physical exercise induces muscle fibers damage and non-specific inflammatory response. Activated by inflammatory process cells may serve as the source of wide spectrum of inflammatory mediators and growth factors. Namely Platelet Derived Growth Factor (PDGF), Transforming Growth Factor-beta (TGF-beta) and Vascular Endothelial Growth Factor (VEGF) could be released. The ...
Collier S R - - 2006
This study investigated the combined effect of resistance exercise and arginine ingestion on spontaneous growth hormone (GH) release. Eight healthy male subjects were studied randomly on four separate occasions [placebo, arginine (Arg), placebo + exercise (Ex), arginine + exercise (Arg+Ex)]. Subjects had blood sampled every 10 min for 3.5 h. ...
Ghanbari-Niaki Abbass - - 2006
INTRODUCTION: It has been suggested that ghrelin may play a role in growth hormone (GH) secretion to exercise. OBJECTIVE: The present study was designed to examine the effects of a single bout of circuit resistance exercise on plasma glucose, ghrelin, GH, and c-peptide, and cortisol. DESIGN AND METHODS: Fourteen volunteer ...
Yang Ji-Yeoun - - 2006
hGH (human growth hormone) is a key factor for metabolism as well as for growth. Lack of hGH usually increases LDL (low-density lipoprotein) while impairing exercise capacity and cardiac function [Amato G., Carella C., Fazio S., La Montagna G., Cittadini A., Sabatini D., Marciano-Mone C., Sacca L., and Bellastella A., ...
Ding Q - - 2006
The ability of exercise to benefit neuronal and cognitive plasticity is well recognized. This study reveals that the effects of exercise on brain neuronal and cognitive plasticity are in part modulated by a central source of insulin-like growth factor-I. Exercise selectively increased insulin-like growth factor-I expression without affecting insulin-like growth ...
Kucukalić-Selimović Elma - - 2006
Growth hormone exerts several metabolic effects, including effects on proteins, fats and carbohydrates. Among the many metabolic activities of GH, two contradictory actions were described: acute and early insulin-like activity and chronic and late anti-insulin like activity also called diabetogenic activity. A dramatic increase in plasma concentration of GH was ...
Brown Gregory A - - 2006
Sublingual intake of 21.4 mg androstenediol increases serum testosterone concentrations whereas swallowing 200 mg androstenediol does not. The duration of increase in serum testosterone following sublingual androstenediol (SL-DIOL) is unknown. Resistance exercise (EX) following SL-DIOL may cause larger increases in serum estradiol concentrations than while at rest. This project evaluated ...
Sherry A E - - 2006
The growth rates of 14 Salmonella serovars in tryptone soy broth plus yeast extract (TSBYE) were estimated using conventional plating techniques and indirect conductimetry using a Don Whitley RABIT system. Both methods gave identical results for the maximum specific growth rate (mumax) P>0.05. However, using the conductimetric method, mumax for ...
Wheldon Adam - - 2006
OBJECTIVE: Ambient temperature alters exercise induced GH secretion. It is unknown whether temperature affects GH secretion at exercise intensities above the anaerobic threshold when other factors may override the relationship seen at lower intensities. METHODS: DESIGN: Cross-over study of ambient temperature on exercise induced GH in swimmers and rowers. SETTING: ...
Royle Nick J - - 2006
Early environmental conditions have been suggested to influence subsequent locomotor performance in a range of species, but most measurements have been of initial (baseline) performance. By manipulating early growth trajectories in green swordtail fish, we show that males that underwent compensatory growth as juveniles had a similar baseline swimming endurance ...
Woodhouse Linda J - - 2006
The availability of recombinant human GH and somatostatin analogs has resulted in widespread treatment for adults with GH deficiency (GHD) and those with GH excess (acromegaly). Despite being at opposite ends of the spectrum in terms of their GH/IGF-I axis, both of these populations experience overlapping somatic impairments. Adults with ...
Ma Zhong - - 2006
Growth within tree populations varies among individuals due to changes in biotic and abiotic factors. The degree of such variation, defined as growth inequality, serves as a useful indicator of the uniformity of growth within a population in response to the prevalent environmental conditions. By application of the Gini coefficient ...
Mero Antti A - - 2006
This study investigated the effects of a heavy resistance exercise session (RES) with the oral daytime ingestion of melatonin on the physiological responses and acute performance. In a randomized and double-blind controlled study 10 healthy male subjects undertook an 80 min intensive hypertrophic RES for major muscles of the lower ...
Climent Vicente E - - 2006
The growth hormone (GH)-insulin-like growth factor-1 axis has great relevance for the regulation of cardiac growth, structure, and function. GH deficiency may result in impaired cardiac performance, manifest by a reduction in left ventricular mass and ejection fraction, but data are inconsistent. GH therapy is recommended treatment in adult patients ...
Kvorning Thue - - 2006
The aim was to study whether whole body vibration (WBV) combined with conventional resistance training (CRT) induces a higher increase in neuromuscular and hormonal measures compared with CRT or WBV, respectively. Twenty-eight young men were randomized in three groups; squat only (S), combination of WBV and squat (S+V) and WBV ...
Kilic Mehmet - - 2006
OBJECTIVES: The present study aims to investigate how exhaustion exercise affects thyroid hormones and testosterone levels in elite athletes who are supplemented with oral zinc sulfate for 4 weeks. METHODS: The study included 10 male wrestlers, who had been licensed wrestlers for at least 6 years. Mean age of the ...
Pokrajac Ana - - 2006
In many centres, a test dose (TD) of octreotide is administered before commencing somatostatin analogue therapy (SAT), although the merits of this procedure are uncertain. We have analysed the value of the GH response to a TD in predicting the efficacy of subsequent SAT in 47 patients with acromegaly (25 ...
Grottoli S - - 2006
CONTEXT: Cortistatin binds all somatostatin receptor subtypes but also has particular central actions; moreover, a specific cortistatin receptor has also been discovered. OBJECTIVE: We compared the endocrine effects of cortistatin-17 with those of somatostatin-14 in patients with acromegaly (ACRO) or prolactinoma (PRLOMA). Normal subjects (NS) were studied as control group. ...
Takemasa, Tohru
TAKEMASA, T., MIYAKAWA, S., NAGATA, S., ESAKI, K., HIROKAWA, M., MACHIDA, M., KOSAKA, Y., HITOMI, Y., KIZAKI, T., OHNO, H. and HAGA, S, Effect of Hyperventilation During Resistance Exercise on Hormonal Response in Humans. Abv. Exerc. Sports Physiol., Vol.10, No.2 pp.55-61, 2004. A Japanese body builder, Mr. Shigemura, recently proposed ...
Jeffery N D - - 2006
A retrospective evaluation of 17 dogs treated surgically for idiopathic acquired laryngeal paralysis demonstrated a marked variability in outcome, with many dogs continuing to exhibit weakness and exercise tolerance. In a subsequent prospective study, 22 consecutive affected dogs were tested for neurological deficits by neurological examination, electrodiagnostic evaluation, and blood ...
Turgut Sebahat - - 2006
Growth hormone (GH) and insulin-like growth factor-I (IGF-I) are closely related molecules. Insulin-like growth factor-binding protein-3 (IGFBP-3) is a main molecule that binds IGF-I. GH, IGF-I and IGFBP-3 have important roles in growth and development. In this study, we investigated the effects of exercise during pregnancy on maternal plasma levels ...
Kalousová Marta - - 2006
BACKGROUND: Dialysis patients are at high risk of vascular/cardiovascular complications with multifactorial pathogenesis, and pregnancy-associated plasma protein A (PAPP-A) is one of the new markers related to cardiovascular risk. Because hemodiafiltration (HDF) is supposed to be better for cardiovascular status, the aim of this study was to describe whether it ...
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: ...
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