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HyperthermiaNCT04596618

Impact of ICE on Exercise Performance in the Heat

A study testing Forearm cooling in people with Hyperthermia, run by University of Connecticut at 1 site in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

The purpose of this study is to determine the effects of intermittent forearm cooling on exercise performance in the heat. Read more about this study

Who is it for?
Ages 18 to 30 years, men onlyHealthy volunteers can take part
Conditions the study is for
Hyperthermia
What is being tested?
Forearm cooling
Type of treatment
Medical device
Could I receive a placebo?
No, everyone receives an active treatment
How many people
12 participants
Where
1 siteUnited States
Study dates
20 Oct 2020to 9 Dec 2020
Phase
Interventional
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 30 years
  • Men only
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • Cisgender male between the ages of 18-30 years
  • been cleared by the medical monitor for the study
  • VO2max >45ml/kg/min

Who cannot join

  • 1. have a current musculoskeletal injury that would limit their physical activity or preclude the participant from walking, jogging, running, sprinting, or cutting.
  • 2. Chronic health problems that affect your ability to thermoregulate (disorders affecting the liver, kidneys or the ability to sweat normally) 3. Fever or current illness at the time of testing 4. History of cardiovascular, metabolic, or respiratory disease 5. Current musculoskeletal injury that limits their physical activity 6. Currently taking a medication that is known to influence body temperature (amphetamines, antihypertensives, anticholinergics, acetaminophen, NSAIDs, aspirin) 7. Are a female 8. Have a history of heat related illness 9. Have any cold allergies or adverse reactions to the cold (i.e. cold urticaria, Raynaud's, cryoglobulinemia)

Trial locations and contacts

1 site in 1 country.

United States1 site
  • Gampel Pavilion

    Storrs, Connecticut, 06269-1110

Other trials in United States

About this study

Official title: Impact of Forearm Immersion Cooling Equipment (ICE) on Exercise Performance in the Heat

The purpose of this study is to determine the effects of intermittent forearm cooling on exercise performance in the heat.

Read the detailed description

The study will be completed in the following timeline:

Visit 1: Baseline and VO2max testing. Visit 2-3: Trial 1 and 2

Visit specific information is described below, however, specific data collection protocols for dependent variables and procedures are included below the description of the study design.

Visit 1: Baseline and VO2max Testing

Participants who are approved to participate will be scheduled for a baseline and VO2max testing day. Upon arrival to the lab, subjects will provide a urine sample in a clean urine cup. Urine specific gravity and urine color will be assessed. Nude body mass will be also be recorded. Privacy will be afforded for each participant while obtaining body mass measures by taking measurements with the participant alone in a private room behind a solid, closed door, and the research reading the scale outside of the room. Participants will only be permitted to continue to the VO2max test if the euhydrated criteria of a urine specific gravity (USG) <1.025 is met. If the participant arrives with a USG between 1.020 and 1.025, the subject will be asked to drink 500 mL of water to ensure proper hydration status. Height will be measured with a tape measure on Visit 1. Percent body fat will be calculated using a 3-site evaluation of skin fold thickness using skin fold calipers. A researcher will use appropriate grasping technique to measure skin fold thickness on the chest, tricep, and abdomen. This will take less than 5 minutes to complete. This information will be used to describe the subject demographics. Participants will also be asked to complete a maximal oxygen uptake (VO2max) test on a treadmill in a thermoneutral environment. This test will provide aerobic fitness levels of the participants. This visit will take approximately 1-2 hours.

Visit 2-3: Trials 1 and 2

Participant numbers will be randomly assigned, and trials will be ordered with a random number generator and assigned to a participant number. These orders will be counterbalanced between participants to ensure that there is not an order effect, and each participant will complete two trials as part of the study. Participants will be allowed to make-up trial visits if they are sick, suffer an injury or do not meet hydration requirements. Participants will be asked if they have a current illness or taking medications to determine whether they can complete the exercise trial. The participant's visit will be rescheduled if they have a fever, current illness or taking medications that influence body temperature.

Participants will complete two trials on two separate days in a randomized counter balanced order:

Trial Cooling Intervention

  1. Passive Cooling
  2. Forearm Immersion

The exercise protocol, cooling intervention, and performance battery portions of this study will be conducted in a climatic chamber with ambient temperature approximately 30-40C and relative humidity at approximately 40-60%. Participants will drink approximately 1.4L of water throughout the exercise trial. Upon arrival to the lab, participants will be asked to indicate if they have consumed alcohol or caffeine in the last 24 hours and 12 hours, respectively. They will not be asked to specify exactly what they have consumed, but if they provide a positive indication, their trial will be rescheduled for another day. Participants will provide a small urine sample in a clean urine cup, and a nude body mass will be measured. Upon arrival to the lab, hydration status will be assessed by urine specific gravity, nude body mass and urine color. Participants will only be permitted to continue to the exercise trial if the euhydrated criteria of a urine specific gravity (USG) <1.025 is met. If the participant arrives with a USG between 1.020 and 1.025, the subject will be asked to drink 500 mL of water to ensure proper hydration status. Participants will be given instructions at the prior visit about how to obtain desired hydration status for the upcoming trial. Participants will insert a rectal probe and wear a heart rate monitor strap. Researchers will insert the esophageal probe. Additionally, participants will wear 4-site skin temperature sensors. Researchers will apply the skin temperature sensors with medical tape to the participants' chest, upper arm, thigh, and calf.

Participants will enter the environmental chamber and sit for 10 minutes to become equilibrated. Participants will wear a metabolic mask during this time to assess baseline metabolic heat production. The environmental chamber will be set to 35C ambient temperature, 50% relative humidity. After baseline measures of heart rate, rectal temperature, and metabolic heat production, participants will complete the perceptual indices. Participants will also complete an environmental symptoms questionnaire (ESQ).

The trial will consist of three, 20-minute exercise bouts consisting of walking, running, and sprinting at varying speeds ranging approximately 20-90% of their VO2max. Followed by a 12-minute "half-time" consisting of passive rest. Participants will then complete three more 20-minute exercise bouts consisting of walking, running, and sprinting at varying speeds ranging approximately 20-90% of their VO2max, for a total of six 20-minute bouts.

Each 20-minute exercise bout with be followed by a 3-minute break where cooling will occur. Participants will be allowed to drink 750mL of water throughout each exercise half for a total of 1.4L. The participant will be cooled for approximately 3 minutes after each 20-minute exercise bout with their assigned cooling modality. Rectal temperature, esophageal temperature, skin temperature, heart rate, perceptual measures, and metabolic heat production will be collected at various time points before, during, and after exercise and cooling. Following the completion of the six 20-minute exercise bouts, participants will perform the performance battery. The performance battery will consist of an agility test, grip strength test, broad-jump test, sprint test, and 1-mile time trial test.

Passive Cooling: Participants will be asked to sit in a chair in the climate chamber for passive cooling.

Forearm immersion: The participant will place both of their forearms in approximately 15C water during forearm immersion.

Each trial will be approximately 3 hours.

All devices will be properly cleaned according to manufacturer's instruction prior to use by other participants.

Conditions
Hyperthermia
Being tested
Forearm cooling
Medical subject headings
Hyperthermia

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Forearm coolingDevice

    forearm cooling will be performed for active cooling assessment.

Study groups in NCT04596618
Study groupRoleWhat they receive
Forearm CoolingActive comparatorParticipants will be actively cooled during rest breaks.
Receives: Device: Forearm cooling
No Forearm CoolingNo interventionParticipants will participant in "passive cooling" where they sit in a chair during rest.

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Change in Rectal Temperature

    Rectal thermometer will be self-inserted by participant to assess core temperature

    Measured: Measured continuously during the duration of the trial (total 150 minutes)

  2. Change in Mean Skin Temperature

    4 skin temperature sensors will be placed on the subject (chest, shoulder, thigh, calf)

    Measured: Measured continuously during the duration of the trial (total 150 minutes)

  3. Change in Heart Rate

    A heart rate monitor will be worn by participant throughout exercise/cooling protocol

    Measured: Measured continuously during the duration of the trial (total 150 minutes)

  4. Change in Esophageal Temperature

    An esophageal thermometer will be inserted by the researchers to assess participants esophageal temperature.

    Measured: Measured continuously during the duration of the trial (total 150 minutes)

  5. Change in Rating of Perceived Exertion (RPE)

    6-20 scale that indicates how hard the participant feels they are working. 6 represents rest and 20 represents maximal exertion. A high score indicates more perceived exertion.

    Measured: Measured every 5 minutes during the duration of the trial (total 150 minutes)

  6. Change in Thermal Sensation (TS)

    0-8 Scale (cold to hot) that indicated how cold or hot the participate feels. 0 = extremely cold, 8 = extremely hot.

    Measured: Measured every 5 minutes during the duration of the trial (total 150 minutes)

  7. Change in Perception of Fatigue

    0-10 (no fatigue to extreme fatigue) Scale that indicates how fatigued the participate feels. High score indicates more fatigue (negative outcome).

    Measured: Measured every 5 minutes during the duration of the trial (total 150 minutes)

  8. Change in Perception of Thirst

    0-9 (no thirst to extreme thirst) Scale that indicates how thirsty the subject feels. A higher score is considered a negative outcome.

    Measured: Measured every 5 minutes during the duration of the trial (total 150 minutes)

  9. Environmental Symptoms

    An environmental symptoms questionnaire to indicate they feel (hot, lethargic, irritable) with the scale ranging from Not at all, a little, somewhat, moderate, a lot, to extreme.

    Measured: Before the start of exercise block 1

  10. Environmental Symptoms

    An environmental symptoms questionnaire to indicate they feel (hot, lethargic, irritable) with the scale ranging from Not at all, a little, somewhat, moderate, a lot, to extreme.

    Measured: After completion of the performance battery, at time point 180min.

  11. Quick-Board Agility

    Agility will be assessed by number of foot taps within 10seconds and then number of hops within 10seconds.

    Measured: After the end of 3min cooling period block 6

  12. Broad Jump

    Participants will attempt to jump as far forward as they can 3 times, measured in centimeters.

    Measured: after the quick-board agility, at time point 153minutes

  13. Grip Strength

    Participants will squeeze a hand held dynamometer 3 times, measured in kilograms

    Measured: after the Broad jump test, at time point 155minutes

  14. Sprints

    On a non-motorized treadmill, participants will sprint for 6sec followed by 24sec of rest, repeat 3 times, belt revolutions will be measured.

    Measured: after the grip strength test, at time point 160minutes

  15. One Mile Timed Trial

    On a motorized treadmill, participants will run at a self-selected pace until they run a distance of 1-mile, time measured in minutes

    Measured: after the sprint test, at time point 170minutes

  16. Metabolic heat production

    Using a metabolic mask and metabolic cart, metabolic heat production will be collected.

    Measured: Measured during the last 5 minutes of each exercise block for a total of six measurements for a total of 36minutes.

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted22 Oct 2020
  2. Study start20 Oct 2020
  3. Primary completion9 Dec 2020
  4. Study completion9 Dec 2020

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Crossover
Model description
Participants receive two cooling treatments on separate study visits: 1) passive cooling 2) forearm immersion cooling
Masking
None (open label)
Enrolment
12 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT04596618
Sponsor's protocol ID
H20-0092
Status last verified
Dec 2020
First submitted
1 Oct 2020
Last updated
21 Dec 2020
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No

Questions about this trial

What is this clinical trial studying?

A study testing Forearm cooling in people with Hyperthermia, run by University of Connecticut at 1 site in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 3 inclusion and 2 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 21 Dec 2020. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Change in Rectal Temperature (time frame: Measured continuously during the duration of the trial (total 150 minutes)). The study lists 16 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 21 Dec 2020.

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