Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
NA
8 participants
INTERVENTIONAL
2013-05-31
2013-12-31
Brief Summary
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Detailed Description
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Procedure. Eight participants will be cooled in 8°C water on three occasions and then warmed by each of three warming conditions. The study will include following specific procedures: Anthropometric data which includes age, weight, height, and measurements of skinfold thickness at four sites- biceps, triceps, subscapularis, and suprailiac will be collected. Participant's heart rate and electrocardiogram will be monitored continuously throughout the experiment.
Participants will be instrumented as follows:
1. About 12 heat flux disks (2 cm in diameter) will be taped to the skin on the arms, legs, torso, head etc. to measure skin temperature and heat transfer from the skin.
2. Three ECG leads will be affixed to the skin.
3. Core temperature will be measured with a disposable esophageal thermocouple. A thin, flexible tube will be inserted through the nose, to midway down the esophagus at the level of the heart.
4. Oxygen consumption will be continuously measured with a metabolic cart. Participants will be asked to wear a face mask which will collect the expired breath during the cooling as well as the rewarming periods.
Conditions: The three treatment methods are as follows.
A. Spontaneous rewarming (Shivering only) - In this control condition, no external heat will be provided and the participant will rewarm spontaneously with the heat produced from shivering.
B. Warm water distal extremities immersion - Distal arms and legs will be immersed in warm water at 45°C for rewarming.
C.Fluidotherapy distal extremities rewarming - Distal arms and legs will be immersed in Fluidotherapy equipment for rewarming at 50°C.
Rewarming procedures will be administered either for a period of 60 minutes or until core temperature returns to normal values ( ̴ 36.5-37˚C). Following that, participants will be placed in a warm water bath (40-42˚C).
Research Design: Each of the three experimental trials, separated by at least 48 hours. On each of the three trials, participants will be immersed up to the level of the sternal notch in 8˚C for up to 60 minutes or until the core temperature falls to 35˚C. The participant will then exit the water, be dried off and rewarmed with either lie inside a vapor barrier within a hooded sleeping bag with the head inside the hood, or sitting with their distal arms and legs immersed in either Fluidotherapy at 50°C or warm water at 45°C. The rewarming will be administered for 60 minutes or until the core temperature returns to normal values (̴36.5-37˚C). The order of warming methods will follow a balanced design.
Conditions
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Study Design
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NA
SINGLE_GROUP
TREATMENT
NONE
Interventions
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Fluidotherapy warming device
Device uses airborne heated cellulose particles which are blown against the skin to provide convective warming.
Other Intervention Names
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Eligibility Criteria
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Inclusion Criteria
Exclusion Criteria
* any symptoms caused by cold exposure
18 Years
45 Years
ALL
Yes
Sponsors
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University of Manitoba
OTHER
Responsible Party
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Dr.Gordon Giesbrecht
Professor
Locations
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University of Manitoba
Winnipeg, Manitoba, Canada
Countries
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Other Identifiers
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NSERC 2011-6
Identifier Type: OTHER_GRANT
Identifier Source: secondary_id
B2013:039
Identifier Type: -
Identifier Source: org_study_id