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Influence of Wet Clothing on Thermal Protection

25. januar 2023 oppdatert av: 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.

Studieoversikt

Status

Rekruttering

Forhold

Intervensjon / Behandling

Detaljert 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).

Studietype

Intervensjonell

Registrering (Forventet)

30

Fase

  • Ikke aktuelt

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiekontakt

Studiesteder

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

18 år til 49 år (Voksen)

Tar imot friske frivillige

Nei

Kjønn som er kvalifisert for studier

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

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Primært formål: Annen
  • Tildeling: Randomisert
  • Intervensjonsmodell: Crossover-oppdrag
  • Masking: Ingen (Open Label)

Våpen og intervensjoner

Deltakergruppe / Arm
Intervensjon / Behandling
Eksperimentell: 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.
Annen: Water-saturated Improved Hot Weather Combat Uniform
Water-saturated Improved Hot Weather Combat Uniform
Eksperimentell: 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.
Annen: Water-saturated Army Combat Uniform
Water-saturated Army Combat Uniform
Eksperimentell: 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.
Annen: Water-saturated Army Combat Uniform + Silk Weights
Water-saturated Army Combat Uniform + Silk Weights
Eksperimentell: 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
Annen: Water-saturated Army Combat Uniform
Water-saturated Army Combat Uniform

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
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
Tiltaksbeskrivelse
Tidsramme
Heart Rate
Tidsramme: 5 hours
Heart Rate will be measured using telemetry [beats per min]
5 hours
Oksygenforbruk/metabolsk varmeproduksjon (MHP)
Tidsramme: flere 5 minutters samlinger opptil 1 time
Oksygenforbruk og MHP vil bli vurdert ved hjelp av datastyrt indirekte kalorimetri [ml/kg/min; Watt per meter i kvadrat]
flere 5 minutters samlinger opptil 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
Termisk komfort
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

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

United States Army Research Institute of Environmental Medicine

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Faktiske)

2. september 2021

Primær fullføring (Forventet)

30. september 2023

Studiet fullført (Forventet)

30. september 2023

Datoer for studieregistrering

Først innsendt

24. mai 2022

Først innsendt som oppfylte QC-kriteriene

3. juni 2022

Først lagt ut (Faktiske)

8. juni 2022

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

27. januar 2023

Siste oppdatering sendt inn som oppfylte QC-kriteriene

25. januar 2023

Sist bekreftet

1. januar 2023

Mer informasjon

Begreper knyttet til denne studien

Ytterligere relevante MeSH-vilkår

Andre studie-ID-numre

  • 21-12H

Plan for individuelle deltakerdata (IPD)

Planlegger du å dele individuelle deltakerdata (IPD)?

Nei

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Studerer et amerikansk FDA-regulert medikamentprodukt

Nei

Studerer et amerikansk FDA-regulert enhetsprodukt

Nei

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