Hasil untuk "Physiology"

M. Steriade, R. McCarley

R. Huey

J. Cheeseman

M. Papetti, I. Herman

M. Abdel‐Tawwab, Mohamed N. Monier, S. Hoseinifar et al.

J. Prosser

C. Paton, J. Ntambi

D. Curran-Everett

J. Siddiqui, N. Partridge

E. Gibson

Y. Yuana, A. Sturk, R. Nieuwland

Body fluids contain surprising numbers of cell-derived vesicles which are now thought to contribute to both physiology and pathology. Tools to improve the detection of vesicles are being developed and clinical applications using vesicles for diagnosis, prognosis, and therapy are under investigation. The increased understanding why cells release vesicles, how vesicles play a role in intercellular communication, and how vesicles may concurrently contribute to cellular homeostasis and host defense, reveals a very complex and sophisticated contribution of vesicles to health and disease.

G. Hofmann, A. Todgham

Paul Ansdell, Kevin Thomas, K. Hicks et al.

What is the topic of this review? We review sex differences within physiological systems implicated in exercise performance; specifically, how they integrate to determine metabolic thresholds and fatigability. Thereafter, we discuss the implications that these sex differences might have for long‐term adaptation to exercise. What advances does it highlight? The review collates evidence from recent physiological studies that have investigated sex as a biological variable, demonstrating that the physiological response to equivalent ‘dosages’ of exercise is not the same in males and females; thus, highlighting the need to research diversity in physiological responses to interventions.

B. McNab, James H. Brown

Lindsay B. Baker, Anthony S. Wolfe

The purpose of this paper is to review the physiological mechanisms determining eccrine sweat composition to assess the utility of sweat as a proxy for blood or as a potential biomarker of human health or nutritional/physiological status. This narrative review includes the major sweat electrolytes (sodium, chloride, and potassium), other micronutrients (e.g., calcium, magnesium, iron, copper, zinc, vitamins), metabolites (e.g., glucose, lactate, ammonia, urea, bicarbonate, amino acids, ethanol), and other compounds (e.g., cytokines and cortisol). Ion membrane transport mechanisms for sodium and chloride are well established, but the mechanisms of secretion and/or reabsorption for most other sweat solutes are still equivocal. Correlations between sweat and blood have not been established for most constituents, with perhaps the exception of ethanol. With respect to sweat diagnostics, it is well accepted that elevated sweat sodium and chloride is a useful screening tool for cystic fibrosis. However, sweat electrolyte concentrations are not predictive of hydration status or sweating rate. Sweat metabolite concentrations are not a reliable biomarker for exercise intensity or other physiological stressors. To date, glucose, cytokine, and cortisol research is too limited to suggest that sweat is a useful surrogate for blood. Final sweat composition is not only influenced by extracellular solute concentrations, but also mechanisms of secretion and/or reabsorption, sweat flow rate, byproducts of sweat gland metabolism, skin surface contamination, and sebum secretions, among other factors related to methodology. Future research that accounts for these confounding factors is needed to address the existing gaps in the literature.

Rachael M. Heuer, M. Grosell

L. P. Manavalan, Satish K. Guttikonda, L. Tran et al.

Mateusz Matwiejuk, Hanna Myśliwiec, Agnieszka Miklosz et al.

Growth hormone (GH) is an ancestral hormone secreted from the anterior pituitary gland. In adulthood, it is essential to regulate metabolism. GH synthesis and secretion are regulated in a complex manner, primarily through the actions of hypothalamic neuropeptides (GHRH and somatostatin) that integrate hormonal, metabolic, and neurogenic signals. Currently, recombinant human GH is widely used to treat growth hormone deficiency (GHD) and numerous non-GHD disorders, such as short stature and catabolic conditions. Conversely, an excess of GH may lead to different and severe conditions, such as acromegaly, gigantism, Carney complex, McCune–Albright syndrome, neurofibromatosis, and multiple endocrine neoplasia type 1. In patients with growth hormone excess disorders or those treated with GH, skin manifestations are common and can include skin thickening, coarsened facial features, skin tags, oily skin, and excessive sweating. These dermatological changes result from the direct actions of GH and IGF-1 (insulin-like growth factor 1) on skin cells and appendages, leading to increased collagen synthesis and connective tissue expansion. This review focuses on the various skin symptoms associated with these disorders caused by GH excess. This narrative review summarizes recent findings on the management of skin lesions in GH-treated patients and in those with GH excess, highlighting the benefits, side effects, and limitations of current therapies.

D. Giussani

C. Hartzell, Ilva Putzier, J. Arreola