Acute Exercise With Overdressing

Completed · Not applicable

Conditions studied: Heat Stress, Exertional, Heat Acclimation and Thermotolerance

In brief

The purpose of this study is to determine if exercise with extra clothing in a gym-like environment can increase body temperatures appropriately to help people adapt to the heat.

Key facts

Study ID

NCT07080853

Run by

United States Army Research Institute of Environmental Medicine

People needed

23

Starts

2023-06-22

Expected to finish

2025-04-28

Last updated by the study team

2025-12-24

Who can join

Age: 18 and older, up to 45. Sex: any. Healthy volunteers: accepted.

You may qualify if…

• Male or female, age 18-45
• Females must be premenopausal
• Body mass index 18.5-30.0 kg m-2
• In good health as determined by the Office of Medical Support \& Oversight (OMSO) General Medical Clearance
• Performs aerobic exercise at least 2 times per week and capable of running 2 miles in under 16:00 (8 minute mile pace)
• Willing to abstain from exercise and alcoholic beverages for 24 hours before each study visit.
• Willing to abstain from caffeine for 12 hours prior to all study visits.
• Willing to abstain from food for 2 hours prior to all study visits.
• Willing to abstain from nicotine/tobacco for at least 8 hours prior to all study visits.
• Have supervisor approval if permanent party military or a federal employee at U.S. Army Natick Soldier System Center

You may not qualify if…

• Females who are pregnant or planning to become pregnant during the study
• Taking dietary supplements, prescriptions, or over the counter medication, other than a contraceptive (unless approved by OMSO \& PI)
• Abnormal blood count during OMSO medical screening (For example: hemoglobin (Hb) outside of the typical normal values reported by LabCorp in accordance with OMSO (Normal [Hb] Males = 12.6-17.7 g/dL; Females = 11.1-15.9 g/dL) or hematocrit (Hct) outside of the normal ranges (Normal Hct Males = 37.5-51.0%; Females = 34.0-46.6%) levels, presence of abnormal blood chemicals (hemoglobin S or sickle cell traits)
• Any history of pulmonary or cardiovascular disease
• Any history of asthma
• Current or recent respiratory tract or sinus infections (< 1 month prior)
• History of heat intolerance or orthostatic intolerance
• Diagnosed and/or treated for fluid/electrolyte imbalance within the last 30 days
• History of obstructive disease of the gastrointestinal tract including (but not limited to) diverticulosis, diverticulitis and inflammatory bowel disease, peptic ulcer disease, Crohn's disease, ulcerative colitis.
• Scheduled MRI during testing
• Allergies to adhesives (e.g., medical tape).

Where it is running

• US Army Research Institute of Environmental Medicine — Natick, Massachusetts, United States

Full record on ClinicalTrials.gov

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