- ICH GCP
- Registre américain des essais cliniques
- Essai clinique NCT05409937
Influence of Wet Clothing on Thermal Protection
Aperçu de l'étude
Statut
Les conditions
Description détaillée
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).
Type d'étude
Inscription (Anticipé)
Phase
- N'est pas applicable
Contacts et emplacements
Coordonnées de l'étude
- Nom: Afton D Seeley, Ph.D.
- Numéro de téléphone: 508-206-2423
- E-mail: afton.d.seeley.civ@health.mil
Lieux d'étude
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Massachusetts
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Natick, Massachusetts, États-Unis, 01760
- Recrutement
- USARIEM
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Contact:
- Afton D Seeley, Ph.D.
- Numéro de téléphone: 508-206-2423
- E-mail: afton.d.seeley.civ@health.mil
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Critères de participation
Critère d'éligibilité
Âges éligibles pour étudier
Accepte les volontaires sains
Sexes éligibles pour l'étude
La description
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.
Plan d'étude
Comment l'étude est-elle conçue ?
Détails de conception
- Objectif principal: Autre
- Répartition: Randomisé
- Modèle interventionnel: Affectation croisée
- Masquage: Aucun (étiquette ouverte)
Armes et Interventions
Groupe de participants / Bras |
Intervention / Traitement |
|---|---|
|
Expérimental: 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.
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Water-saturated Improved Hot Weather Combat Uniform
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Expérimental: 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.
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Water-saturated Army Combat Uniform
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Expérimental: 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.
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Water-saturated Army Combat Uniform + Silk Weights
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Expérimental: 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
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Water-saturated Army Combat Uniform
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Que mesure l'étude ?
Principaux critères de jugement
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
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Core Temperature
Délai: 5 hours
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Core temperature will be measured using a temperature pill that is inserted as a rectal suppository.
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5 hours
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Skin Temperature
Délai: 5 hours
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Skin temperature will be measured using 11 different skin-attached temperature sensors.
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5 hours
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Mesures de résultats secondaires
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
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Heart Rate
Délai: 5 hours
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Heart Rate will be measured using telemetry [beats per min]
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5 hours
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Consommation d'oxygène/Production de chaleur métabolique (MHP)
Délai: plusieurs collectes de 5 minutes jusqu'à 1 heure
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La consommation d'oxygène et le MHP seront évalués à l'aide de la calorimétrie indirecte informatisée [ml/kg/min ; Watts par mètre carré]
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plusieurs collectes de 5 minutes jusqu'à 1 heure
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Thermal Sensation (whole body, feet, and hands)
Délai: multiple 1 minute collections up to 1 hour
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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.
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multiple 1 minute collections up to 1 hour
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Thermal Comfort
Délai: multiple 1 minute collections up to 1 hour
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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).
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multiple 1 minute collections up to 1 hour
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Perceived Skin Wetness
Délai: multiple 1 minute collections up to 1 hour
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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).
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multiple 1 minute collections up to 1 hour
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Collaborateurs et enquêteurs
Dates d'enregistrement des études
Dates principales de l'étude
Début de l'étude (Réel)
Achèvement primaire (Anticipé)
Achèvement de l'étude (Anticipé)
Dates d'inscription aux études
Première soumission
Première soumission répondant aux critères de contrôle qualité
Première publication (Réel)
Mises à jour des dossiers d'étude
Dernière mise à jour publiée (Réel)
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière vérification
Plus d'information
Termes liés à cette étude
Termes MeSH pertinents supplémentaires
Autres numéros d'identification d'étude
- 21-12H
Plan pour les données individuelles des participants (IPD)
Prévoyez-vous de partager les données individuelles des participants (DPI) ?
Informations sur les médicaments et les dispositifs, documents d'étude
Étudie un produit pharmaceutique réglementé par la FDA américaine
Étudie un produit d'appareil réglementé par la FDA américaine
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