- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02084797
V2 Receptor Effects on Fluid Regulation and Performance
April 6, 2016 updated by: Tamara Hew-Butler, Oakland University
Revisiting the Human Sweat Gland - Does Arginine Vasopressin Modulate Sweat Sodium Concentration Via the V2 Receptor?
This primary aim of this study was to critically assess whether or not sweat water content and sodium concentration were acutely regulated by dynamic changes in antidiuretic hormone (arginine vasopressin or AVP) acting on the Vasopressin 2 receptor (V2R) during exercise.
Secondary aims were to evaluate running performance and core temperature to further characterize the role of AVP in the coordinated balance of fluid and temperature homeostasis during exercise.
The primary hypothesis was that activation of the V2R in sweat glands would result in water reabsorption and fluid conservation during endurance exercise.
Study Overview
Status
Completed
Conditions
Intervention / Treatment
Detailed Description
Ten healthy habitual runners (> 50km running per week) between 18-60 years of age participated in this double blind randomized control trial.
Each subject presented to the exercise lab on four separate occasions.
Trial 1 was a familiarization trial to determine each subject's maximal aerobic capacity and peak treadmill running speak (VO2 Peak test).
Trials 2, 3 and 4 utilized the same exact protocol, differing only in pharmacological intervention.
In a randomized, double-blind order (both participant and investigator blinded to the intervention), either a placebo pill, the V2 receptor antagonist tolvaptan (Samsca™, 30mg tablet), or the V2 receptor agonist desmopressin (DDAVP™, 0.2mg tablet) was ingested along with the CorTemp™ Core Temperature Sensor two hours before commencement of the Exercise Trial with 240mL of bottled water.
The exercise protocol consisted of 60 minutes of treadmill running at 60% of peak speed (steady-state) followed by a performance test (the VO2 Peak test).
Blood, saliva and urine, were collected before the exercise trial (baseline) and again after both the steady-state run and performance runs.
Sweat was obtained from sweat patches after both the steady-state and performance runs.
Core temperature, fluid intake, performance time, body weight, thirst and sodium palatability ratings were also assessed.
Free access to water was allowed during the trial and all urine produced during the trial was measured and collected.
The main outcome measure was sweat sodium concentration.
Study Type
Interventional
Enrollment (Actual)
10
Phase
- Not Applicable
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
-
-
Michigan
-
Rochester, Michigan, United States, 48309
- Oakland University
-
-
Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
18 years to 60 years (Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion Criteria:
- Healthy (no acute or chronic medical conditions or regular prescription medication use), habitual (>50km/week)
- Distance runners between the ages of 18-60 years.
Exclusion Criteria:
- Individuals with chronic medical problems which require regular prescription medication
- Runners with pre-existing kidney problems
- Unable to sense thirst
- Difficulty swallowing
- Gastrointestinal disorders
- History of fainting associated with blood draw.
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Double
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: all study participants
All study participants received all interventions.
V2R Antagonist: 30mg Tolvaptan tablet ingested 2 hours before exercise.
V2R agonist: 0.2mg DDAVP tablet ingested 2 hours before exercise Placebo
|
All ten subjects were used as their own controls in this double-blind, randomized controlled trial assessing the effect of the V2R on sweat sodium concentration via use of a V2R blocker (antagonist), stimulator (agonist), against a placebo (drug naive state).
Other Names:
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Sweat Sodium Concentration Obtained After the Steady-state Portion of the Trial
Time Frame: 4 study trials (4 weeks)
|
Changes in sweat sodium concentration will parallel changes in urine sodium concentration with use of the V2R antagonist, agonist and placebo if the primary hypothesis is true (sweat sodium is regulated by the V2R, similar to how urine sodium is regulated by principle cells located within in the kidney collecting duct)
|
4 study trials (4 weeks)
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Urine Sodium Concentration After the Steady-state Portion of the Trial
Time Frame: 4 study trials (4 weeks)
|
Changes in urine sodium concentration after use of the V2R antagonist, agonist and placebo interventions will verify whether or not pharmacologic activation or inhibition was successfully induced.
|
4 study trials (4 weeks)
|
Blood Sodium Concentration
Time Frame: 4 study trials (4 weeks)
|
Measurement of blood sodium concentration will determine if normonatremia (blood sodium concentrations within the normal physiological range of 135-145mmol/L) were maintained throughout the trial with appropriate fluid intake during the V2R antagonist, agonist and placebo intervention trials.
|
4 study trials (4 weeks)
|
Saliva Sodium Concentration
Time Frame: 4 trials (4 weeks)
|
Measurement of salivary sodium concentration will allow us to determine if the V2R antagonist, agonist and placebo interventions activate aquaporin-5 (AQP5) water channels that are also located in sweat glands.
If the V2R acts on the sweat glands through AQP5, there should be parallel changes in sweat, urine and saliva sodium concentrations with each pharmaceutical intervention.
|
4 trials (4 weeks)
|
Other Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Body Weight
Time Frame: 4 trials (4 weeks)
|
Changes in body weight during the V2R antagonist, agonist and placebo conditions will provide researchers with an additional measure of overall fluid balance (fluid in versus fluid out) as well as an estimate of overall sweat water losses.
|
4 trials (4 weeks)
|
Core Temperature
Time Frame: 4 trials (4 weeks)
|
Measurement of core temperature using an ingestible CorTemp sensor during the V2R antagonist, agonist and placebo trials will allow researchers to assess if fluid homeostasis and thermoregulation were intertwined in response to each pharmacological intervention.
|
4 trials (4 weeks)
|
Thirst Rating
Time Frame: 4 trials (4 weeks)
|
To determine if fluid intake behaviors were appropriately regulated in response to the V2R antagonist, agonist and placebo conditions during exercise.
|
4 trials (4 weeks)
|
Sodium Palatability Ratings
Time Frame: 4 weeks (4 trials)
|
To determine if sodium preference ratings were appropriately regulated in response to the V2R antagonist, agonist and placebo conditions during exercise.
|
4 weeks (4 trials)
|
Performance
Time Frame: 4 trials (4 weeks)
|
To determine if exercise performance, as determined by overall exercise time, was affected in response to the V2R antagonist, agonist and placebo conditions.
|
4 trials (4 weeks)
|
Fluid Intake
Time Frame: 4 weeks (4 trials)
|
To determine if fluid intake behaviors were appropriately regulated in response to the V2R antagonist, agonist and placebo conditions during exercise.
|
4 weeks (4 trials)
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Collaborators
Investigators
- Principal Investigator: Tamara D Hew-Butler, PhD, Oakland University
- Study Director: Joseph G Verbalis, MD, Georgetown University
Publications and helpful links
The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start
June 1, 2011
Primary Completion (Actual)
October 1, 2011
Study Completion (Actual)
October 1, 2012
Study Registration Dates
First Submitted
March 10, 2014
First Submitted That Met QC Criteria
March 11, 2014
First Posted (Estimate)
March 12, 2014
Study Record Updates
Last Update Posted (Estimate)
May 12, 2016
Last Update Submitted That Met QC Criteria
April 6, 2016
Last Verified
April 1, 2016
More Information
Terms related to this study
Additional Relevant MeSH Terms
- Metabolic Diseases
- Water-Electrolyte Imbalance
- Hyponatremia
- Hypernatremia
- Physiological Effects of Drugs
- Molecular Mechanisms of Pharmacological Action
- Natriuretic Agents
- Hemostatics
- Coagulants
- Vasoconstrictor Agents
- Antidiuretic Hormone Receptor Antagonists
- Antidiuretic Agents
- Tolvaptan
- Vasopressins
- Arginine Vasopressin
Other Study ID Numbers
- RAM#4713
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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