Evaluating and testing hydration status is increasingly requested by rehabilitation, sport, military and performance-related activities. Besides commonly used biochemical hydration assessment markers within blood and urine, which have their advantages and limitations in collection and evaluating hydration status, there are other potential markers present within saliva, sweat or tear. This literature review focuses on body fluids saliva, sweat and tear compared to blood and urine regarding practicality and hydration status influenced by fluid restriction and/or physical activity. The selected articles included healthy subjects, biochemical hydration assessment markers and a well-described (de)hydration procedure. The included studies (n=16) revealed that the setting and the method of collecting respectively accessing body fluids are particularly important aspects to choose the optimal hydration marker. To obtain a sample of saliva is one of the simplest ways to collect body fluids. During exercise and heat exposures, saliva composition might be an effective index but seems to be highly variable. The collection of sweat is a more extensive and time-consuming technique making it more difficult to evaluate dehydration and to make a statement about the hydration status at a particular time. The collection procedure of tear fluid is easy to access and causes very little discomfort to the subject. Tear osmolarity increases with dehydration in parallel to alterations in plasma osmolality and urine-specific gravity. But at the individual level, its sensitivity has to be further determined.
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http://dx.doi.org/10.1038/ejcn.2017.136 | DOI Listing |
Anasthesiol Intensivmed Notfallmed Schmerzther
January 2025
After severe trauma, but also perioperatively, massive bleeding is associated with increased morbidity and mortality. In severely injured patients, hemorrhagic shock remains to be the main cause of death in addition to traumatic brain hemorrhage. In non-cardiac surgery, a surgical bleeding complication increases perioperative morbidity (intensive care length of stay, acute renal failure, infections, thromboembolic complications) by a factor of three to four and mortality by a factor of six.
View Article and Find Full Text PDFPoult Sci
January 2025
College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China; Key Laboratory of Animal Production, Product Quality and Security, Ministry of Education, Changchun 130118, China; Jilin Key Laboratory of Animal Nutrition and Feed Science, Changchun 130118, China. Electronic address:
Hesperidin exhibits promising potential as a feed additive for augmenting gastric acid secretion in animals. Gastrointestinal function is essential for animal growth and the efficient digestion of dietary nutrients, with gastric acid secretion serving as one of its critical components. The secretion of gastric acid, together with other digestive fluids and substances, significantly influences the digestion and absorption of animal feed, which in turn affects growth performance.
View Article and Find Full Text PDFPediatr Allergy Immunol
January 2025
The Nutrition Innovation Centre for Food and Health, School of Biomedical Sciences, Ulster University, Coleraine, Northern Ireland, UK.
Background: Studies investigating associations between prenatal polyunsaturated fatty acid status (PUFAs), in particular the anti-inflammatory n-3 PUFAs, and the development of childhood asthma have yielded conflicting results.
Objective: To determine the associations between maternal fish intake (a rich source of the n-3 PUFAs), maternal or cord PUFAs with the prevalence of childhood asthma in a high fish-eating population.
Methods: We examined these associations between fish intake and PUFA concentrations with childhood asthma prevalence in the Seychelles Child Development Study Nutrition Cohort 2, a large observational study in a high fish-eating population.
J Exp Med
February 2025
Brain Immunology and Glia (BIG) Center, Washington University in St. Louis, St. Louis, MO, USA.
Dysfunctional lymphatic drainage from the central nervous system (CNS) has been linked to neuroinflammatory and neurodegenerative disorders, but our understanding of the lymphatic contribution to CNS fluid autoregulation remains limited. Here, we studied forces that drive the outflow of the cerebrospinal fluid (CSF) into the deep and superficial cervical lymph nodes (dcLN and scLN) and tested how the blockade of lymphatic networks affects CNS fluid homeostasis. Outflow to the dcLN occurred spontaneously in the absence of lymphatic pumping and was coupled to intracranial pressure (ICP), whereas scLN drainage was driven by pumping.
View Article and Find Full Text PDFFront Cell Infect Microbiol
January 2025
Department of Neurology, Harrison International Peace Hospital, Hengshui, China.
Purpose: Varicella zoster virus-related encephalitis (VZV-RE) is a rare and often misdiagnosed condition caused by an infection with the VZV. It leads to meningitis or encephalitis, with patients frequently experiencing poor prognosis. In this study, we used metagenomic next-generation sequencing (mNGS) to rapidly and accurately detect and identify the VZV pathogen directly from cerebrospinal fluid (CSF) samples, aiming to achieve a definitive diagnosis for encephalitis patients.
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