Human Hydration Status Monitoring
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ClinicalTrials.gov Identifier: NCT01124903 |
Recruitment Status :
Completed
First Posted : May 17, 2010
Last Update Posted : April 22, 2020
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Condition or disease | Intervention/treatment | Phase |
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Dehydration | Procedure: Dehydration | Not Applicable |
Well-recognized markers for static (one time) or dynamic (monitoring over time) dehydration assessment have not been rigorously tested for their usefulness in clinical, military, and sports medicine communities.
This study evaluated the components of biological variation and accuracy of potential markers in plasma, urine, saliva, and body mass, for static and dynamic dehydration assessment. Design: Eighteen healthy volunteers (13M, 5F) were studied while carefully controlling hydration and numerous pre-analytical factors. Biological variation was determined over three consecutive days using published methods. Atypical values based on statistical deviations from a homeostatic set-point were examined. Measured deviations in body fluid were produced using a separate, prospective dehydration experiment and evaluated by ROC analysis to quantify diagnostic accuracy.
All dehydration markers displayed substantial individuality and half displayed marked heterogeneity of intra-individual variation. Decision levels for all dehydration markers were within one standard deviation of the ROC criterion values and most were nearly identical to the prospective group means after dehydrating volunteers by 1.8 - 7.0% of body mass. However, only plasma osmolality (Posm) showed statistical promise for use in static dehydration assessment. A 301 ± 5 mmol/kg diagnostic decision level is proposed. Reference change values (RCV) of 9 mmol/kg (Posm), 0.010 (urine specific gravity, Usg), and 2.5% change in body mass (Bm) were also statistically valid for dynamic dehydration assessment at the 95% probability level.
Posm is the only useful marker for static dehydration assessment. Posm, Usg, and Bm are valid markers in the setting of dynamic dehydration assessment.
Study Type : | Interventional (Clinical Trial) |
Actual Enrollment : | 31 participants |
Allocation: | N/A |
Intervention Model: | Single Group Assignment |
Intervention Model Description: | single-sample pre-post design |
Masking: | Single |
Primary Purpose: | Basic Science |
Official Title: | Human Hydration Status Monitoring: Phase I |
Study Start Date : | January 2009 |
Actual Primary Completion Date : | February 2011 |
Actual Study Completion Date : | March 2011 |
Arm | Intervention/treatment |
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Experimental: Dehydration
Multiple measures of hydration status were made when subjects were normally hydrated (euhydrated) and when dehydrated. The diagnostic usefulness of the measures was determined.
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Procedure: Dehydration
Subjects were dehydrated by 2 - 7% of body mass over 3-5 hours using exercise-heat stress and fluid restriction.
Other Name: Hypohydration |
- Evidence of clinical dehydration [ Time Frame: 24 hours ]Dehydration was carefully imposed in healthy human subjects. The diagnostic usefulness of multiple classic and novel dehydration assessment measures was made.

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Ages Eligible for Study: | 18 Years to 39 Years (Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | Yes |
Inclusion Criteria:
- You are a member of the U.S. Army between 18-39 years of age
- You have passed the APFT within the previous 12 months
- You have completed and passed a recent medical physical exam
- You are willing to discuss with OMSO and the Principle Investigator (PI) all medications and supplements you are taking and you are willing to stop taking any supplements not approved by OMSO and the PI.
Exclusion Criteria:
- You have any physical problems that would make exercise difficult
- You have ever had a heat injury or have a history of having trouble in the heat
- You have an allergy to sulfa drugs
- You have been treated for dry eyes
- You are pregnant, planning on becoming pregnant during the study, or are presently lactating

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01124903
United States, Massachusetts | |
USARIEM | |
Natick, Massachusetts, United States, 01760-5007 |
Principal Investigator: | Samuel N Cheuvront, PhD | United States Army Research Institute of Environmental Medicine |
Responsible Party: | United States Army Research Institute of Environmental Medicine |
ClinicalTrials.gov Identifier: | NCT01124903 |
Other Study ID Numbers: |
H08-12 |
First Posted: | May 17, 2010 Key Record Dates |
Last Update Posted: | April 22, 2020 |
Last Verified: | April 2020 |
dehydration hypohydration diagnostic accuracy biological variation hydration assessment |
body mass osmolality plasma saliva urine |
Dehydration Water-Electrolyte Imbalance Metabolic Diseases Pathologic Processes |