Influence of Wet Clothing on Thermal Protection
調査の概要
状態
状態
条件
条件
介入・治療
介入・治療
詳細な説明
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).
研究の種類
研究の種類
入学 (予想される)
入学
段階
段階
- 適用できない
連絡先と場所
研究連絡先
研究連絡先
- 名前:Afton D Seeley, Ph.D.
- 電話番号:508-206-2423
- メール:afton.d.seeley.civ@health.mil
研究場所
-
-
Massachusetts
-
Natick、Massachusetts、アメリカ、01760
- 募集
- USARIEM
-
コンタクト:
- Afton D Seeley, Ph.D.
- 電話番号:508-206-2423
- メール:afton.d.seeley.civ@health.mil
-
-
参加基準
適格基準
適格基準
就学可能な年齢
健康ボランティアの受け入れ
受講資格のある性別
説明
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.
研究計画
研究はどのように設計されていますか?
デザインの詳細
- 主な目的:他の
- 割り当て:ランダム化
- 介入モデル:クロスオーバー割り当て
- マスキング:なし(オープンラベル)
アーム数
武器と介入
参加者グループ / アーム参加者グループ / アーム |
介入・治療介入・治療 |
|---|---|
|
実験的: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.
|
Water-saturated Improved Hot Weather Combat Uniform
|
|
実験的: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.
|
Water-saturated Army Combat Uniform
|
|
実験的: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.
|
Water-saturated Army Combat Uniform + Silk Weights
|
|
実験的: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
|
Water-saturated Army Combat Uniform
|
この研究は何を測定していますか?
主要な結果の測定
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
Core Temperature
時間枠:5 hours
|
Core temperature will be measured using a temperature pill that is inserted as a rectal suppository.
|
5 hours
|
|
Skin Temperature
時間枠:5時間
|
Skin temperature will be measured using 11 different skin-attached temperature sensors.
|
5時間
|
二次結果の測定
二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
Heart Rate
時間枠:5 hours
|
Heart Rate will be measured using telemetry [beats per min]
|
5 hours
|
|
酸素消費/代謝熱産生 (MHP)
時間枠:複数の 5 分間コレクション (最大 1 時間)
|
酸素消費量と MHP は、コンピューター化された間接熱量測定 [ml/kg/分;ワット/平方メートル]
|
複数の 5 分間コレクション (最大 1 時間)
|
|
Thermal Sensation (whole body, feet, and hands)
時間枠: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
時間枠: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
時間枠: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
|
協力者と研究者
スポンサー
スポンサー
研究記録日
主要日程の研究
研究開始 (実際)
研究開始
一次修了 (予想される)
一次修了
研究の完了 (予想される)
研究の完了
試験登録日
最初に提出
最初に提出
QC基準を満たした最初の提出物
QC基準を満たした最初の提出物
最初の投稿 (実際)
最初の投稿
学習記録の更新
投稿された最後の更新 (実際)
投稿された最後の更新
QC基準を満たした最後の更新が送信されました
QC基準を満たした最後の更新が送信されました
最終確認日
最終確認日
詳しくは
この情報は、Web サイト clinicaltrials.gov から変更なしで直接取得したものです。研究の詳細を変更、削除、または更新するリクエストがある場合は、register@clinicaltrials.gov。 までご連絡ください。 clinicaltrials.gov に変更が加えられるとすぐに、ウェブサイトでも自動的に更新されます。