Dehydration Clinical Trial
Official title:
Biomarkers for Noninvasive Assessment of Human Hydration
Low levels of dehydration (the loss of body water corresponding to 2% of the body weight), deteriorate physical and cognitive performance and may also be linked to a number of chronic diseases. The standard test used for the assessment of hydration status is plasma osmolality. This blood test is invasive, requires time and laboratory equipment and is not accurate for isotonic dehydration. The goal of this project is to determine whether a new molecular technology, saliva-based Stress Response Profiling (SRP) biomarkers, could be used for non-invasive diagnostics of dehydration.
Dehydration, or the loss of body water, is a common health problem during military
operations, athletic events and illness, particularly in children and the elderly.
Warfighters frequently become dehydrated when training or fighting in hot and mountainous
environments because heat and high altitude increase body water losses. The negative
consequences of dehydration worsen as body water losses increase. Severe dehydration (>10%)
is a life-threatening emergency that may result in heat illness, seizures, permanent brain
damage or death. The most common type of dehydration is caused by sweat loss during heavy
physical labor or exercise (hypertonic dehydration). A different type of dehydration can be
caused by blood loss, burns, diarrhea, vomiting or diuretic drugs used for example by
diabetics (isotonic dehydration). Despite the critical importance of proper fluid balance to
human performance and health, no field-expedient, non-invasive dehydration test is available
for either form of dehydration. The ultimate goal of this project is to develop a
field-expedient, non-invasive test for both types of dehydration. The test will be sensitive
to 2% dehydration, a critical threshold for performance impairment and a statistically valid
decision point for hydration assessment.
Design: Fifteen volunteers will be first euhydrated (well-hydrated) and then moderately
dehydrated (2-4%) using two procedures. First, sweat loss during exercise in the heat
without fluids (hypertonic dehydration). Second, excessive urination stimulated by a
diuretic pill called Lasix (isotonic dehydration). SRP biomarkers in saliva samples will be
compared to changes in body weight, and to known hydration indicators in blood and urine.
Results will identify the best SRP biomarkers for diagnosing both types of dehydration and
compare accuracy of the new saliva test to the existing hydration indicators.
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Observational Model: Case-Only, Time Perspective: Cross-Sectional
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