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Influence of Wet Clothing on Thermal Protection

25. januar 2023 opdateret af: United States Army Research Institute of Environmental Medicine
The aim of this investigation is to provide guidance for assessing the influence of wet clothing, and its drying time, on body temperature responses during cold air exposure. Twelve healthy and fit adults (men and women aged 18-49) will complete this study. Four cold air exposures (41°F, 180 min) will be randomly conducted, each while wearing a different clothing ensemble that has been saturated by water. During each cold air exposure, you will be asked to rest for 60 min and perform weighted (38.5lbs) treadmill walking for up to 120 min.

Studieoversigt

Status

Rekruttering

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Participants, in their first visit, will undergo baseline weighted treadmill walking consisting of ~20 min of treadmill walking with a load of 77lbs followed by ~25 min of treadmill walking with a load of 38.5lbs. They will also have their body composition evaluated (DEXA) and be fit for each uniform ensemble. This first laboratory visit will require ~3 hrs.

On separate days, participants will complete 4 experimental trials. After being submerged up to the neck in warm water for two minutes, three of the trials will ask that the participant move to a 41°F air environment, stand with minimal movement for 60 min, complete 60 min of weighted (38.5lb) treadmill walking at 2 mph, and up to 4% grade, and then complete 60 min of weighted (38.5lb) treadmill walking at 2.5 mph and up to 4% grade. Each of these three experimental trial visits will require ~5 hrs.

A single trial will ask that after being saturated in warm water, participants enter a 41°F air environment, immediately begin weighted treadmill walking (38.5lbs) at 2.0mph and up to 4% grade for a duration of 60 min before standing with minimal movement for 60 min. This trial will require ~4 hrs.

During all experimental trials, the primary outcomes include core temperature, measured continuously using a small pill inserted as a rectal suppository, and skin temperature, measured continuously using 11 small skin attached sensors. Secondary outcomes include metabolic rate, heart rate, thermal perceptions, and changes in body mass.

Non-federally employed civilians may be eligible to be paid $13.50/hour for participation (for a total of up to $310).

Undersøgelsestype

Interventionel

Tilmelding (Forventet)

30

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiekontakt

Studiesteder

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år til 49 år (Voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • Military or civilian, male or female, between the ages of 18 (17 if active duty military) and 49 years.
  • Able to carry a rucksack weighing 35 kg (77lbs) for at least 20 minutes and able to carry a rucksack weighing 17.5kg (38.5lbs) for up to 120 minutes
  • In good health as determined by our OMSO (Office of Medical Support and Oversight) General Medical Clearance.
  • Vaccinated against COVID 19.
  • Willing to refrain from heavy exercise and alcoholic beverages for 24 hours before each testing session.
  • Willing to refrain from smoking or tobacco use for 8 hours before each testing session.
  • Willing to refrain from caffeine ingestion for 12 hours before each testing session.
  • Body fat percentage <18% for males, < 24% for females, once 6 individuals of higher body fat (18% or greater for males, 24% or greater for females) have completed the study.

Exclusion Criteria:

  • History of cold injuries.
  • Raynaud's syndrome.
  • Cold-induced asthma/bronchospasm.
  • Medications or dietary supplements that could alter cardiovascular, thermoregulatory, or vascular control.
  • Heart, lung, kidney, muscle, or nerve disorder(s).
  • Planned MRI during or within two days after completing the study.
  • Known allergy to adhesives.
  • Female and pregnant, planning to become pregnant, or breastfeeding.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Andet
  • Tildeling: Randomiseret
  • Interventionel model: Crossover opgave
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Improved Hot Weather Combat Uniform
Wearing the Improved Hot Weather Combat Uniform; Asked to perform 60 min of standing with minimal movement, 60 min weighted (38.5lb) treadmill walking at 2.0mph, up to 4% grade, 60 min weight (38.5lb) treadmill walking at 2.5mph, up to 4% grade.
Andet: Water-saturated Improved Hot Weather Combat Uniform
Water-saturated Improved Hot Weather Combat Uniform
Eksperimentel: Army Combat Uniform
Wearing the Army Combat Uniform; Asked to perform 60 min of standing with minimal movement, 60 min weighted (38.5lb) treadmill walking at 2.0mph, up to 4% grade, 60 min weight (38.5lb) treadmill walking at 2.5mph, up to 4% grade.
Andet: Water-saturated Army Combat Uniform
Water-saturated Army Combat Uniform
Eksperimentel: Army Combat Uniform + Silk Weights
Wearing the Army Combat Uniform + a base layer of silk weights; Asked to perform 60 min of standing with minimal movement, 60 min weighted (38.5lb) treadmill walking at 2.0mph, up to 4% grade, 60 min weight (38.5lb) treadmill walking at 2.5mph, up to 4% grade.
Andet: Water-saturated Army Combat Uniform + Silk Weights
Water-saturated Army Combat Uniform + Silk Weights
Eksperimentel: Army Combat Uniform- XR
Wearing the Army Combat Uniform; Asked to perform 60 min weighted (38.5lb) treadmill walking at 2.0mph, up to 4% grade, followed by 60 min of standing with minimal movement
Andet: Water-saturated Army Combat Uniform
Water-saturated Army Combat Uniform

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Core Temperature
Tidsramme: 5 hours
Core temperature will be measured using a temperature pill that is inserted as a rectal suppository.
5 hours
Skin Temperature
Tidsramme: 5 hours
Skin temperature will be measured using 11 different skin-attached temperature sensors.
5 hours

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Heart Rate
Tidsramme: 5 hours
Heart Rate will be measured using telemetry [beats per min]
5 hours
Oxygen Consumption/Metabolic Heat Production (MHP)
Tidsramme: flere 5 minutters samlinger op til 1 time
Iltforbrug og MHP vil blive vurderet ved hjælp af computerstyret indirekte kalorimetri [ml/kg/min; Watt pr. meter i kvadrat]
flere 5 minutters samlinger op til 1 time
Thermal Sensation (whole body, feet, and hands)
Tidsramme: multiple 1 minute collections up to 1 hour
Thermal sensation will be assessed using the American Society of Heating, Refrigerating and Air-conditioning Engineers Thermal Sensation Scale. This scale has numbers from -4 to +4 with every whole number accompanied by a verbal expression. The verbal expressions are used only to give the subject a relative feeling pertaining to the relative sensation. For example, -4 is associated with very cold whereas +4 is associated with very hot.
multiple 1 minute collections up to 1 hour
Thermal Comfort
Tidsramme: multiple 1 minute collections up to 1 hour
Thermal comfort will be assessed using a standard Thermal Comfort Scale. We will ask volunteers to rate how comfortable they feel with respect to temperature sensation. The scale has numbers ranging from 0 to 4 and with descriptors ranging from comfortable (0) to intolerable (4).
multiple 1 minute collections up to 1 hour
Perceived Skin Wetness
Tidsramme: multiple 1 minute collections up to 1 hour
Perceived Skin Wetness will be assessed using an adapted Skin Wetness Perception Scale. The scale ranges from 0 (extremely dry) to -6 (extremely wet; soaked).
multiple 1 minute collections up to 1 hour

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

United States Army Research Institute of Environmental Medicine

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

2. september 2021

Primær færdiggørelse (Forventet)

30. september 2023

Studieafslutning (Forventet)

30. september 2023

Datoer for studieregistrering

Først indsendt

24. maj 2022

Først indsendt, der opfyldte QC-kriterier

3. juni 2022

Først opslået (Faktiske)

8. juni 2022

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

27. januar 2023

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

25. januar 2023

Sidst verificeret

1. januar 2023

Mere information

Begreber relateret til denne undersøgelse

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • 21-12H

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