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Frontiers of Hormone Research

Joseph A M J L Janssen
Physical exercise may be vital to the maintenance of the endocrine system with aging and its helps to restore loss of activity of the endocrine system with aging. There is evidence that physical exercise induces activity of the growth hormone-insulin-like growth factor-1 axis and so produces anabolic effects in skeletal muscles. Mechano growth factor (MGF), a locally produced isoform of IGF-1, has been hypothesized to be important for the maintenance of skeletal muscles with aging. Short-term high-resistance exercise results in an increase of MGF mRNA in young but not in elderly subjects...
2016: Frontiers of Hormone Research
Erick Richmond, Alan D Rogol
The impact of exercise training on the neuroendocrine control of the pituitary in the developing child is complex and the exact mechanisms are not fully understood. Multiple determinants influence adaptive hypothalamic-pituitary secretory responses to physical stress, namely, training intensity and duration, nutrition and energy balance, gender, age, sex, and sexual maturation status. The increase in growth hormone (GH) in response to acute exercise is dependent on pubertal status; children in more advanced pubertal stages respond with larger peak GH concentrations compared to those in earlier stages...
2016: Frontiers of Hormone Research
Paolo Moghetti, Elisabetta Bacchi, Corinna Brangani, Silvia Donà, Carlo Negri
Exercise has a powerful action on metabolism, and adaptation of the body to changes induced by exercise is fundamental to be able to provide the energy required for muscle contraction and physiological functions of vital tissues. Depending on the intensity and duration of exercise, different mechanisms are called on to make energy available, and under homeostatic control, this is guaranteed by rapid and coordinated changes in the secretion of several hormones. Molecular mechanisms controlling muscle function and fiber phenotype are related to the specific mode of muscle activation...
2016: Frontiers of Hormone Research
Natalia Cano Sokoloff, Madhusmita Misra, Kathryn E Ackerman
The hypothalamic-pituitary-gonadal (HPG) axis is essential for adequate responses to exercise and training both acutely and chronically. Both testosterone and estrogen play leading roles in neuromuscular adaptation to exercise in males and females. The purpose of this chapter is to illustrate the physiological and pathological changes that occur in the HPG axis secondary to exercise and training. In males, testosterone increases with acute bouts of exercise, but long-term effects are less clear, with evidence of lower testosterone in endurance athletes...
2016: Frontiers of Hormone Research
Martine Duclos, Antoine Tabarin
Exercise represents a potent physiological stimulus upon the hypothalamo-pituitary adrenal (HPA) axis. Two major factors modulate the HPA axis response to exercise: intensity and duration. Endurance training per se does not induce permanent hypercortisolism as endurance-trained subjects have similar biological markers of HPA axis activity in resting condition as healthy untrained men. However, during a challenge of the HPA axis, endurance-trained subjects demonstrate an adaptation of the HPA axis activity to repeated exercise resulting from decreased tissular sensitivity to glucocorticoids...
2016: Frontiers of Hormone Research
Anthony C Hackney, Hope C Davis, Amy R Lane
This chapter addresses what is known about the endocrine system components growth hormone (GH)-insulin-like growth factor (IGF) axis, thyroid axis, and prolactin relative to exercise and exercise training. Each one of these hormone axes contributes to the maintenance of homeostasis in the body through impact on a multitude of physiological systems. The homeostatic disruption of exercise causes differing responses in each hormone axis. GH levels increase with sufficient stimulation, and IGFs are released in response to GH from the anterior pituitary providing multiple roles including anabolic properties...
2016: Frontiers of Hormone Research
Federico Ponzetto, Sylvain Giraud, Nicolas Leuenberger, Julien Boccard, Raul Nicoli, Norbert Baume, Serge Rudaz, Martial Saugy
Over the past few years, the World Anti-Doping Agency (WADA) has focused its efforts on detecting not only small prohibited molecules, but also larger endogenous molecules such as hormones, in the view of implementing an endocrinological module in the Athlete Biological Passport (ABP). In this chapter, the detection of two major types of hormones used for doping, growth hormone (GH) and endogenous anabolic androgenic steroids (EAASs), will be discussed: a brief historical background followed by a description of state-of-the-art methods applied by accredited anti-doping laboratories will be provided and then current research trends outlined...
2016: Frontiers of Hormone Research
Marisa Porrini, Cristian Del Boʼ
Great interest is currently shown for the contribution of nutrition to optimize training and athletic performance, and a considerable debate exists about the potential ergogenic value of several dietary supplements. However, most of the products used by athletes do not provide sufficient scientific evidence regarding their efficacy in enhancing physical performance as well as their specificity of action and safety. For this reason, sport nutrition professionals need skills in evaluating the scientific value of papers and advertisements on ergogenic aids and supplements in order to support athletes in their choice...
2016: Frontiers of Hormone Research
Wolfgang Jelkmann
Total hemoglobin (Hb) mass is an important determinant of aerobic power. The glycoprotein erythropoietin (Epo) promotes the production of red blood cells (RBCs). The present article reviews the regulation of erythropoiesis and ways of its manipulation. The various Epos, e.g. recombinant human (rh)Epo and (epoetin), and their long-acting analogues can be misused by cheating athletes, but the drugs are detectable by chemical tests, because their glycan isoform structures differ from those of endogenous Epo. Still, anti-doping control has become more difficult, since additional erythropoiesis-stimulating agents have become available (Epo mimetics, activin inhibitors, and small-molecule chemical drugs activating EPO expression)...
2016: Frontiers of Hormone Research
Adam R Nicholls, Richard I G Holt
Human growth hormone (GH) was first isolated from the human pituitary gland in 1945 and found to promote the growth of children with hypopituitarism. Since the formation of the World Anti-Doping Association, human GH has appeared on the list of forbidden substances. There is a significant amount of anecdotal evidence that human GH is misused by athletes to enhance performance, and there have been a number of high-profile cases of GH use in professional sport. GH secretagogues (GH-Ss), which increase GH secretion, and insulin-like growth factor (IGF-1), which mediates many of the effects of GH, are also misused, although there is less evidence for this...
2016: Frontiers of Hormone Research
Rakesh Iyer, David J Handelsman
Androgen abuse is the most potent and prevalent form of sports doping detected. It originated from the early years of the Cold War as an epidemic confined to drug cheating within elite power sports. In the decades following the end of the Cold War, it has become disseminated into an endemic based within the illicit drug subcultures serving recreational abusers seeking cosmetic body sculpting effects. Within sports, both direct androgen abuse (administration of androgens), as well as indirect androgen abuse (administration of nonandrogenic drugs to increase endogenous testosterone), is mostly readily detectable with mass spectrometry-based anti-doping urine tests...
2016: Frontiers of Hormone Research
Rosario Pivonello, Maria Cristina De Martino, Davide Iacuaniello, Chiara Simeoli, Giovanna Muscogiuri, Francesco Carlomagno, Monica De Leo, Alessia Cozzolino, Annamaria Colao
Cushing's syndrome (CS) is a severe chronic and systemic condition caused by endogenous or exogenous excess of glucocorticoids, associated with increased morbidity and mortality. Patients with active CS suffer from many metabolic alterations, including visceral obesity, systemic arterial hypertension, impairment of glucose metabolism and dyslipidemia. Additionally, in these patients several cardiovascular abnormalities, i.e. atherosclerosis, clotting disorders, left ventricular hypertrophy, concentric remodeling and diastolic dysfunction have been documented...
2016: Frontiers of Hormone Research
Fritz-Line Vélayoudom-Céphise, Magali Haissaguerre, Antoine Tabarin
Primary adrenal hypercortisolism is mainly due to cortisol-producing adrenocortical adenomas, bilateral micronodular or macronodular disease, and adrenal carcinomas. Important advances in the pathophysiology of primary adrenal hypercortisolism have been made in the last few years, partly through the use of new molecular biology tools. Most adrenal abnormalities leading to increased cortisol production involve somatic or germinal mutations of genes encoding elements of the cyclic AMP/protein kinase A signaling pathway, as shown in adrenal adenomas in 2014...
2016: Frontiers of Hormone Research
Katerina Simunkova, Eystein S Husebye
Glucocorticoid treatment in adrenal insufficiency remains a challenge since many patients complain of fatigue, reduced health-related quality of life and working ability. Moreover, there is a fear of increased mortality and morbidity related to adrenal crises and chronic overexposure to glucocorticoids. In order to counter these negative effects on daily life and future health, recent recommendations speak for lower replacement doses and administration forms that attempt to mimic the circadian variation in cortisol...
2016: Frontiers of Hormone Research
Iacopo Chiodini, Valentina Morelli
Subclinical hypercortisolism (SH) is a condition of mild cortisol excess, found in the 5-30% of patients with adrenal incidentalomas, defined as silent adrenal masses diagnosed throughout radiological examinations performed for unrelated diseases. Generally, the diagnosis of SH is supported by the presence of high cortisol levels after a 1-mg dexamethasone suppression test, low adrenocorticotropic hormone levels, altered cortisol circadian rhythm and 24-hour urinary free cortisol levels higher than the upper reference value...
2016: Frontiers of Hormone Research
Mabel Yau, Ahmed Khattab, Dix Poppas, Lucia Ghizzoni, Maria New
Congenital adrenal hyperplasia (CAH) describes a family of disorders that comes from enzymatic deficiencies in cortisol production, with 21-hydroxylase deficiency causing ∼90% of cases. Distinction is made between the severe classical form and milder nonclassical form of CAH. Molecular genetic analysis is used to confirm the hormonal diagnosis. A high rate of genotype-phenotype disconcordance has been found in 21-hydroxylase deficiency. The goal of treatment is to replace with synthetic glucocorticoids and mineralocorticoids and suppress adrenal androgen production...
2016: Frontiers of Hormone Research
Miguel Debono, John D Newell-Price
The diagnosis of Cushing's syndrome is challenging to endocrinologists as patients often present with an insidious history, together with subtle external clinical features. Moreover, complications of endogenous hypercortisolism, such as visceral obesity, diabetes, hypertension and osteoporosis, are conditions commonly found in the population, and discerning whether these are truly a consequence of hypercortisolism is not straightforward. To avoid misdiagnosis, a careful investigative approach is essential. The investigation of Cushing's syndrome is a three-step process...
2016: Frontiers of Hormone Research
Stephanie Burger-Stritt, Alina Pulzer, Stefanie Hahner
For a long time it has been assumed that patients with chronic adrenal insufficiency under established replacement therapy have a normal life expectancy and a normal everyday life. Recent studies now indicate both an impairment of quality of life (QoL) with a negative impact on daily life and increased mortality in a significant number of patients. The clinical presentation of patients varies considerably. While some neither suffer from reduced QoL nor from adrenal crisis, others are significantly more affected by the disease...
2016: Frontiers of Hormone Research
Francesca Pecori Giraldi, Alberto G Ambrogio
The distinction between Cushing's syndrome and pseudo-Cushing is a major clinical challenge. Indeed, any endocrinologist used to dealing with Cushing's syndrome has certainly faced this dilemma more than once and is aware that there are no clear-cut solutions. Several factors contribute to this ongoing quandary, such as unbalanced epidemiology, overlap in clinical features and inherent variability in test responses. Thus, extreme care has to be taken in both excluding and confirming Cushing's syndrome in patients with mild clinical features and borderline laboratory alterations...
2016: Frontiers of Hormone Research
Federica Guaraldi, Ioannis Karamouzis, Rita Berardelli, Valentina D'Angelo, Alessia Rampino, Clizia Zichi, Ezio Ghigo, Roberta Giordano
Adrenal failure secondary to hypothalamic-pituitary disease is a common although underestimated and underdiagnosed condition, with serious consequences. Corticotropin deficiency can be isolated or more frequently occur in association with other pituitary hormones deficiencies. The most frequent endogenous cause of secondary adrenal insufficiency (SAI) is a tumor of the hypothalamic-pituitary region, usually associated with panhypopituitarism secondary to tumor growth or to its treatment with surgery or irradiation...
2016: Frontiers of Hormone Research
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