Search Results
Results 301 - 350 of 1112
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Ehrnborg Christer - - 2008
Growth Hormone (GH) is an important and powerful metabolic hormone that is secreted in a pulsatile pattern from cells in the anterior pituitary, influenced by several normal and pathophysiological conditions. Human GH was first isolated in the 1950s and human derived cadaveric GH was initially used to treat patients with ...
Hoffman Jay R - - 2008
The effect of a pre-exercise energy sport drink on the acute hormonal response to resistance exercise was examined in eight experienced resistance trained men. Subjects were randomly provided either a placebo (P: maltodextrin) or the supplement (S: combination of branched chain amino acids, creatine, taurine, caffeine, and glucuronolactone). Subjects performed ...
Mossberg Kurt A - - 2008
GH deficiency occurs in approximately 20% of all individuals who suffer from a moderate to severe traumatic brain injury. This study determined whether GH deficiency secondary to traumatic brain injury had an effect on aerobic capacity. Subjects were screened for GH deficiency by the glucagon stimulation test and performed a ...
Cardinale M - - 2010
OBJECTIVE: Whole-body vibration (WBV) has been recently suggested as an alternative form of exercise. In this study, the acute effects of a single session of WBV exercise on anabolic hormones in aged individuals were analysed. DESIGN: A randomised cross-over trial design was used. SETTINGS: Geriatrics Department, Woodend Hospital. PARTICIPANTS: 20 ...
Karkoulias K - - 2008
BACKGROUND: Exercise is known to be a powerful stimulus for the endocrine system. The hormonal response to exercise is dependent on several factors including the intensity, duration, mode of exercise (endurance versus resistance), and training status of the subject. The aim of the present study was to determine the steroid ...
Day Danielle S - - 2008
The number of publications addressing sex differences and exercise physiology has increased from 12, before 1970, to as many as 1344 through October 2007, according to a recent PubMed search. The following symposium represents three distinct examples of how exercise physiologists are approaching the issue of sex differences in various ...
Milne Kevin J - - 2008
Sex is a potent modifier of the cardiovascular system because males and females differ in several aspects of the heart's biology and physiology. Epidemiologically, premenopausal women possess a distinct advantage over men in the occurrence of cardiovascular heart disease; however, this advantage shifts to men once a negative cardiac event ...
Bricout V-A - - 2008
The aim of the present study was to analyse whether hormonal responses could explain an exercise limitation in Down's syndrome (DS). Fourteen young men with DS (mean age 22.5 +/- 0.7 years) and 15 controls (CONT, mean age 22.5 +/- 0.3 years) participated in the study. During a treadmill submaximal ...
Nass Ralf R Department of Medicine, University of Virginia, Charlottesville, VA 22908, - - 2008
The timing and frequency of GH secretory episodes is regulated by GHRH and somatostatin. This study provides evidence for amplification of these GH pulses by endogenous acyl-ghrelin. Blood was sampled every 10 min for 26.5 h during a fed admission with standardized meals and also during the final 24 h ...
Sartorio A - - 2008
AIM: The aim of this study was to evaluate growth hormone (GH) and ghrelin levels in response to physical exercise in athletes. METHODS: Two different exercise workloads were administered in two different groups of athletes. Group A athletes (19 males, 18 females; mean age +/- standard deviation: 25+/-6.7 years), performing ...
Sartorio A - - 2008
BACKGROUND: It is well established that repeated GHRH administration or repeated voluntary exercise bouts are associated with a complete blunting of GH responsiveness when the administration of the second stimulus follows the first one after a 2-h interval. AIM: To evaluate GH responses to neuromuscular electrical stimulation (NMES) in healthy ...
Beaven C Martyn - - 2008
The acute response of free salivary testosterone (T) and cortisol (C) concentrations to four resistance exercise (RE) protocols in 23 elite men rugby players was investigated. We hypothesized that hormonal responses would differ among individuals after four distinct RE protocols: four sets of 10 repetitions (reps) at 70% of 1 ...
Bottaro Martim - - 2009
This study investigated the acute hormonal response to three different rest periods between sets of a traditional lower body resistance training session in young women. Twelve healthy trained females (26.83+/-3.93 years) participated in the study. On three separate sessions of a lower body resistance exercise protocol, subjects were assigned in ...
Berg U - - 2008
The insulin-like growth factor (IGF)-IGF binding proteins (BP) and the pituitary-gonadal axes were investigated during ultra endurance exercise in 16 endurance-trained athletes (seven women). Median duration of the race was 6.3 days. Although food and drink were ad libitum, energy balance was negative. Blood samples were drawn before (PRE), at ...
Hawkins Vivian N VN Cancer Prevention Program, The Fred Hutchinson Cancer Research Center, Seattle, WA 98109, - - 2008
The effect of exercise on androgens in middle-aged to older men is poorly understood, and it could have implications for several aspects of health. This analysis was conducted to examine the effects of long-term aerobic exercise on serum sex hormones in middle-aged to older men. One hundred two sedentary men, ...
Stokes Keith A - - 2008
A single 30-s sprint is a potent physiological stimulus for growth hormone (GH) release. However, repeated bouts of sprinting attenuate the GH response, possibly due to negative feedback via elevated systemic free fatty acids (FFA). The aim of the study was to use nicotinic acid (NA) to suppress lipolysis to ...
Powers Michael E - - 2008
Oral administration of the amino acid/inhibitory neurotransmitter gamma aminobutyric acid (GABA) reportedly elevates resting serum growth hormone (GH) concentrations. PURPOSE: To test the hypothesis that GABA ingestion stimulates immunoreactive GH (irGH) and immunofunctional GH (ifGH) release at rest and that GABA augments the resistance exercise-induced irGH/ifGH responses. METHODS: Eleven resistance-trained ...
Kanaley Jill A - - 2008
PURPOSE OF REVIEW: To describe the effect of an acute bout of exercise on growth hormone responses and to discuss the effect of L-arginine supplementation on growth hormone responses. RECENT FINDINGS: Recent studies have shown that resting growth hormone responses increase with oral ingestion of L-arginine and the dose range ...
Vislocky Lisa M - - 2008
BACKGROUND: Although several studies have investigated gender differences in the substrate and endocrine responses during and following endurance exercise, few have studied sex differences during a more prolonged recovery period post endurance exercise. The purpose of this study was to compare and characterize the endocrine and substrate profiles of trained ...
Godfrey, R.J.
Background: Studies measuring human growth hormone (hGH) in blood during exercise have mainly used venous sampling. The invasive nature of this procedure makes evaluation of hGH impossible in various exercise environments. Objective: To determine whether capillary sampling could offer an alternative sampling method. Methods: Capillary and venous blood samples were ...
Ratamess Nicholas A - - 2007
The authors aimed to examine the acute hormonal and performance responses to resistance exercise with and without prior consumption of an amino acid/creatine/energy supplement. Eight men performed a resistance-exercise protocol at baseline (BL), 20 min after consuming a supplement (S) consisting of essential amino acids, creatine, taurine, caffeine, and glucuronolactone ...
Collomp K - - 2008
OBJECTIVE: To investigate the effects of short-term prednisolone ingestion combined with intense training on exercise performance, hormonal (adrenocorticotrophic hormone (ACTH), prolactin, luteinising hormone (LH), growth hormone (GH), thyroid-stimulating hormone (TSH), dehydroepiandrosterone (DHEA), testosterone, insulin) and metabolic parameters (blood glucose, lactate, bicarbonate, pH). METHODS: Eight male recreational athletes completed four cycling ...
Kyröläinen Heikki - - 2008
The purpose of the present study was to test the hypothesis that the magnitude of hormonal concentration alterations during a prolonged military field exercise with constant energy intake (EI) is influenced by changes in energy deficit (ED) induced by varying the exercise intensity. Basal serum hormone concentrations were measured in ...
Ghanbari-Niaki Abbass - - 2008
Obestatin is a 23 amino acid peptide recently isolated from rat stomach that is encoded by the same gene as ghrelin. Obestatin has opposite action to ghrelin on food intake and plays a role in energy balance. The purpose of the present study was to investigate the effect of a ...
Marzetti Emanuele - - 2008
Growth hormone (GH) supplementation at old age has been shown to improve body composition, although its effect on muscle performance is still debated. On the other hand, resistance training increases muscle mass and strength even when initiated at advanced age. In the present study, we investigated the effects of short-term ...
Cinar Vedat - - 2008
The effects of a 1-month exercise program and magnesium supplementation on the adrenocorticotropic hormone and cortisol levels were studied in young tae-kwon-do and sedentary subjects both at rest and exhaustion. The hormone levels were compared before and after supplementation with 10 mg of magnesium (as magnesium sulfate) per kilogram of ...
Hartman Mark L - - 2008
CONTEXT: Several studies have demonstrated an improvement in aerobic exercise capacity with 6 months of GH replacement in adults with GH deficiency (GHD). OBJECTIVE: The objective of the study was to determine whether improvements in aerobic exercise capacity with GH treatment in adults with GHD are related to changes in ...
Fayad Fouad - - 2008
We aimed to describe 3D scapular kinematics and scapulohumeral rhythm (SHR) in glenohumeral (GH) osteoarthritis shoulders compared to unaffected shoulders and to compare the abnormal scapular kinematic schema for GH osteoarthritis with that for frozen shoulder. Thirty-two patients with stiff shoulder (16 with GH osteoarthritis and 16 with frozen shoulder) ...
Díaz López B - - 2007
Melatonin secretion can be influenced by acute exercise. Using female Syrian hamsters we assessed the influence of physical exercise in the serum melatonin rhythm. Melatonin concentrations were determined by RIA. After a gradually increased training program in which experiments were performed at the end of the light phase of the ...
Berg U - - 2007
OBJECTIVE: To study interstitial IGF-I concentrations in resting and exercising skeletal muscle in relation to the circulating components of the IGF-IGF binding protein (IGFBP) system. DESIGN AND METHODS: Seven women performed endurance exercise with 1 leg (Ex-leg) for 1 h. The resting leg (Rest-leg) served as a control. IGF-I was ...
Kilic Mehmet - - 2007
OBJECTIVE: The aim of this study was to determine how exercise affects thyroid hormones and testosterone levels in sedentary men receiving oral zinc for 4 weeks. METHODS: The study included 10 volunteers (mean age, 19.47+/-1.7 years) who did not exercise. All subjects received supplements of oral zinc sulfate (3 mg/kg/day) ...
Barnard R James - - 2007
Epidemiological studies report that regular physical activity can reduce the risk for prostate cancer. This study was conducted to investigate possible mechanisms to explain the epidemiological data. Serum from sedentary controls or men with regular (5 days/week) aerobic exercise was used to stimulate lymph node cancer of the prostate (LNCaP) ...
Duclos Martine - - 2007
Activation of the hypothalamo-pituitary-adrenal (HPA) axis and of the growth hormone/insulin-like growth factor-1 (GH/IGF-1) axis represents a physiological response to the energetic, metabolic, vascular, and sometimes neurophysiologic or psychological needs of exercise. Long-lasting increased and (or) decreased secretion of cortisol (the end-product of the HPA axis) or of GH is ...
De Palo Elio F - - 2008
BACKGROUND: Human growth hormone (hGH) responds to bouts of exercise by increasing, while the insulin-like growth factor-I (IGF-I) responses are conflicting. METHODS: Twenty well-trained male cyclists completed a brief duration exercise (A: warm up+increasing workload until exhaustion, lasting 25 min) and a medium duration exercise (B: warm up+70-80%VO(2 max)+increasing workload ...
Copeland J L - - 2008
The purpose of this research was to compare changes in circulating levels of total IGF-I and IGFBP-3 during continuous, moderate-intensity exercise (CE) and high-intensity interval exercise (IE) of equal duration. Ten healthy males completed 2 exercise sessions and a resting control session (R) in random order. The CE was 20 ...
Micmacher E - - 2008
BACKGROUND: The use of growth hormone (GH) in deficient adults has already been demonstrated to result in several benefits regarding metabolic parameters, body composition and quality of life. Due to the similarities between GH deficiency in adults and the aging process, the concept of somatopause has emerged. OBJECTIVES: Correlate the ...
Gibney James - - 2007
The syndrome of adult GH deficiency and the effects of GH replacement therapy provide a useful model with which to study the effects of the GH/IGF-I axis on exercise physiology. Measures of exercise performance including maximal oxygen uptake and ventilatory threshold are impaired in adult GH deficiency and improved by ...
Arlettaz Alexandre - - 2007
PURPOSE: To examine the prednisolone's ergogenic and metabolic effects during submaximal exercise. METHODS: Ten recreational male athletes completed two cycling trials at 70-75% peak O2 consumption until exhaustion after either placebo (Pla, lactose) or oral prednisolone (Pred, 60 mg.d(-1) for 1 wk) treatment, according to a double-blind and randomized protocol. ...
de Graaf-Roelfsema E - - 2007
Overtraining is an imbalance between training and recovery leading to symptoms associated with a neuroendocrine dysbalance called the overtraining syndrome, a disease characterized by behavioral, emotional and physical symptoms similar with depression. Although the prevalence of overtraining is high in human and equine athletes, at present no sensitive and specific ...
Enevoldsen Lotte H - - 2007
To determine whether blockade of the exercise-induced increase in growth hormone (GH) secretion may affect the regional lipolytic rate in the post-exercise recovery period, the aim of the present experiments was to study the effect of infusion of the somatostatin analogue octreotide on the s.c., abdominal adipose tissue metabolism, before, ...
Kraemer William J - - 2007
The purpose of this study was to determine the influence of a comprehensive multi-component nutritional supplement on performance, hormonal, and metabolic responses to an acute bout of resistance exercise. Nine healthy subjects ingested either Muscle Fuel (MF) or a matched placebo (PL) for 7 days. Subjects then reported to the ...
- - 2007
To assess the changes in counterregulatory hormones overnight after an afternoon of structured exercise or sedentary activity in children with type 1 diabetes mellitus (T1DM), the Diabetes Research in Children Network (DirecNet) studied 50 children (10 to <18 yr) with T1DM in five clinical research centers on two separate days ...
Galvão D A - - 2008
This study examined the effect of 20 weeks resistance training on a range of serum hormones and inflammatory markers at rest, and following acute bouts of exercise in prostate cancer patients undergoing androgen deprivation. Ten patients exercised twice weekly at high intensity for several upper and lower-body muscle groups. Neither ...
Williams Joseph B - - 2007
We measured resting and peak metabolic rates (RMR and PMR, respectively) during development of chicks of seven species of shorebirds: least sandpiper (Calidris minutilla; adult mass 20-22 g), dunlin (Calidris alpina; 56-62 g), lesser yellowlegs (Tringa flavipes; 88-92 g), short-billed dowitcher (Limnodromus griseus; 85-112 g), lesser golden plover (Pluvialis dominicana; ...
Arlettaz A - - 2008
OBJECTIVE: To examine whether acute glucocorticoid (GC) intake alters performance and selected hormonal and metabolic variables during submaximal exercise. METHODS: In total, 14 recreational male athletes completed two cycling trials at 70-75% maximum O(2) uptake starting 3 h after an ingestion of either a lactose placebo or oral GC (20 ...
Jürimäe Jaak - - 2007
The aim of the present investigation was to investigate plasma ghrelin response to acute maximal exercise in elite male rowers. Eight elite male rowers performed a maximal 6000-m rowing ergometer test (mean performance time: 19 mins 52 secs; 1192.1 +/- 16.4 secs), and venous blood samples were obtained before, immediately ...
Erskine Julie - - 2007
Whole body vibration (WBV) has been proposed as an alternative exercise stimulus to produce adaptive responses similar to resistance exercise. Few studies have analysed acute hormonal responses to WBV. Purpose To evaluate neuromuscular and hormonal responses to an acute bout of isometric half-squat exercise with and without superimposition of WBV. ...
Parmentier Eric - - 2007
The biomineralization of otoliths results mainly from the release of soluble Ca(2+), which is in turn precipitated as CaCO(3) crystals. In some Carapidae, sagittae sections have been shown to reveal a three-dimensional asymmetry with a nucleus close to the sulcal side, an unusual position. This study seeks to understand otolith ...
Messier S P - - 2007
OBJECTIVE: This preliminary study sought to determine whether using 1500/1200mg of glucosamine hydrochloride and chondroitin sulfate (GH/CS) is effective, both separately and combined with exercise, compared to a placebo plus exercise program in improving physical function, pain, strength, balance, and mobility in older adults with knee osteoarthritis (OA). METHODS: This ...
Müller Thomas - - 2007
Acute levodopa (LD) application and exercise release human growth hormone (GH). An earlier trial showed, that combined stimulus of exercise and LD administration is the best provocative test for GH response in healthy participants. Objective was to show this combined effect of LD application and exercise on GH response and ...
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