The Effect of Ventilated Vest on Thermoregulation During Exercise in Hot
Trial Snapshot
- Phase
- Not Applicable
- Sponsor
- Sheba Medical Center
- Enrollment
- 10
- Locations
- 1
- Primary Endpoint
- Heat tolerance test
Study Overview
Brief Summary
The purpose of this preliminary experiment is to measure the effect of a novel ventilation system on the physiological strain during exercise in high heat load while wearing ballistic protective vest. Ten young and healthy participants will participate in the study. They will all go through a six days heat acclimation period in a heat chamber according to a valid protocol. Afterwards they will be randomly exposed to 4 conditions during four separate consecutive days.
Detailed Description
Ten young and healthy civilian participants will participate in the study. They will all go through a six days heat acclimation period in a heat chamber according to a valid protocol. After heat acclimation the participant will be randomly exposed to 4 conditions during four separate consecutive days: 1) walking on a treadmill for two hours in hot-wet conditions (30OC, 70% RH) while wearing military uniforms and a vest (control group); 2) walking on a treadmill for two hours in hot-dry conditions (40OC, 30% RH) while wearing military uniforms and a vest (control group); 3) walking on a treadmill for two hours in hot-wet conditions (30OC, 70% RH) while wearing military uniforms and a vest with a ventilator (experimental group); 4) walking on a treadmill for two hours in hot-dry conditions (40OC, 30% RH) while wearing military uniforms and a vest with a ventilator (experimental group). During the heat exposures, rectal temperature, skin temperature and heart rate will be continuously monitored. Subjective comfort measures, heat strain indices, sweat rate and sweat evaporation will be also measured/calculated. The differences in the above measures, during exposure to exercise in the heat between ventilator and no ventilator will be then analyzed.
Study Design
- Study Type
- Interventional
- Allocation
- Na
- Intervention Model
- Single Group
- Primary Purpose
- Basic Science
- Masking
- None
Eligibility Criteria
- Ages
- 21 Years to 28 Years (Adult)
- Sex
- Male
- Accepts Healthy Volunteers
- Yes
Inclusion Criteria
- •age 21-28
- •after medical checkup
- •after signing concent form
Exclusion Criteria
- •heart disease
- •respiratory disease
- •baseline bp above 140/90 mmHg
- •sleep disorders
- •anhydrosis
- •skin disease
- •acute illness in last 3 days prior to the examination
Outcomes
Primary Outcomes
Heat tolerance test
Time Frame: 1 year
The test is performed in a climatic chamber at a temperature of 40oC and 40% relative humidity. During the test, the subject walks on a treadmill at a speed of 5 km/hr at a 2% grade for 2h. Body core temperature and heart rate are continuously monitored, and sweat rate is computed from body weight prior to and after the test, corrected for fluid intake. Heat intolerance is determined when body core temperature elevates above 38.5oC, when heart rate elevates above 150 bpm, or when either does not tend to reach a plateau.
Maximal oxygen consumption test
Time Frame: 1 year
Volunteer's oxygen consumption (VO2) will be monitored continuously with a metabolic chart (ZAN), while running for 10 min on a treadmill under comfortable environmental conditions.
Secondary Outcomes
- Skin temperature(1 year)
- Rectal temperature(1 year)
- Heart rate(1 year)
Investigators
Dr. Barliz Adato
Head Physician at the Institute of Military Physiology, Heller Institute of Medical Research
Sheba Medical Center