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Behavioural Intervention

Pre-Cooling for Heat Stress

N/A

Recruiting

Led By Glen P Kenny, PhD

Research Sponsored by University of Ottawa

Eligibility Criteria Checklist

Specific guidelines that determine who can or cannot participate in a clinical trial

Must have

Healthy young males (18-30 years)

Be between 18 and 65 years old

Must not have

Physical restriction limiting physical activity

Sedentary

Timeline

Screening 3 weeks

Treatment Varies

Follow Up final 15 minutes of the 60 minutes exercise bout

Awards & highlights

No Placebo-Only Group

Summary

"This trial aims to understand how pre-cooling the body with cold-water immersion can improve endurance exercise performance in hot environments. By lowering the body's core temperature before exercise, individuals may be able to exercise

Who is the study for?

This trial is for individuals who can safely perform moderate-intensity cycling and are interested in how pre-cooling strategies might affect their body's heat exchange during exercise in hot conditions. Specific eligibility criteria were not provided.

What is being tested?

The study tests the effect of pre-cooling the body with cold-water immersion before exercising in a hot environment, compared to no cooling. It measures how this affects the body's ability to lose heat while cycling for an hour at moderate intensity.

What are the potential side effects?

Potential side effects may include discomfort from cold exposure during pre-cooling and possible heat stress symptoms like fatigue or dizziness during exercise. However, detailed side effects were not specified.

Eligibility Criteria

Inclusion Criteria

You may be eligible if you check “Yes” for the criteria below

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I am a healthy male aged between 18 and 30.

Exclusion Criteria

You may be eligible for the trial if you check “No” for criteria below:

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I have a physical condition that limits my activity.

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I lead a mostly inactive lifestyle.

Timeline

Screening ~ 3 weeks3 visits

Treatment ~ Varies

Follow Up ~ final 15 minutes of the 60 minutes exercise bout

Screening ~ 3 weeks

Treatment ~ Varies

Follow Up ~final 15 minutes of the 60 minutes exercise bout

This trial's timeline: 3 weeks for screening, Varies for treatment, and final 15 minutes of the 60 minutes exercise bout for reporting.

Treatment Details

Study Objectives

Study objectives can provide a clearer picture of what you can expect from a treatment.

Primary study objectives

Body heat storage during the 60-minute exercise bout

Core temperature at end of exercise

Dry heat loss at end exercise

+11 more

Secondary study objectives

Heart rate variability at end of exercise

Awards & Highlights

No Placebo-Only Group

All patients enrolled in this study will receive some form of active treatment.

Trial Design

2Treatment groups

Experimental Treatment

Active Control

Group I: Pre-CoolingExperimental Treatment1 Intervention

Participants will undergo a cold-water immersion (\~17°C) to elicit a decrease in rectal temperature by 0.5°C from baseline values. Thereafter, once the target temperature is achieved, participants will complete 60 min of continuous moderate-intensity cycling (200 W/m2) in the heat (wet-bulb globe temperature of 29°C; 37.5°C and 35% relative humidity).

Group II: No CoolingActive Control1 Intervention

Participants will complete 60 min of continuous semi-recumbent cycling at a fixed metabolic heat load (200 W/m2) in the heat (wet-bulb globe temperature of 29°C; 37.5°C and 35% relative humidity) (Control condition) without pre-cooling.

0 / 3Eligibility criteria met