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Exercise Intensity and Heat Responses in Children and Youth

NCT07781592 · Status: ENROLLING_BY_INVITATION · Phase: NA · Type: INTERVENTIONAL · Enrollment: 12

Last updated 2026-08-24

No results posted yet for this study

Summary

Little is known about how children and youth regulate body temperature during exercise in the heat compared with young adults, including whether differences in whole-body heat exchange contribute to their responses. The goal of this clinical trial is to determine how exercise intensity affects thermoregulation in boys and girls aged 9-16 years compared with young adult men and women aged 20-25 years. Participants will complete three study visits in a hot environment of 36°C (degree Celcius (97°F, degree Farenheit)), performing light-, moderate-, and vigorous-intensity exercise corresponding to metabolic heat production of 120, 160, and 200 W/m² (w=watts, m=meter), respectively. During each visit, participants will complete four 15-minute bouts of exercise (i.e., bout 1, 2, 3 and 4 respectively) separated by 15-minute rest periods. Testing will be performed in a whole-body air calorimeter, a specialized chamber that precisely measures heat lost through evaporation and dry heat exchange and the amount of heat stored in the body. These measurements, together with core temperature and heart rate, will allow researchers to determine how increasing exercise intensity affects the body's ability to lose heat and whether these responses differ between children and youth and young adults.

Conditions

  • Body Temperature Changes
  • Heat Stress
  • Child Development
  • Heat
  • Physiological Stress

Interventions

OTHER

Low-Intensity Exercise in the Heat

Participants complete intermittent low-intensity exercise at a metabolic heat production of 120 W/m² (w=watts; m=meter) in a hot environment of 36°C (degree Celsius (97°F, degree Fahrenheit)).

OTHER

Moderate-Intensity Exercise in the Heat

Participants complete intermittent moderate-intensity exercise at a metabolic heat production of 160 W/m² in a hot environment of 36°C (97°F).

OTHER

Vigorous-Intensity Exercise in the Heat

Participants complete intermittent vigorous-intensity exercise at a metabolic heat production of 200 W/m² in a hot environment of 36°C (97°F).

Sponsors & Collaborators

  • University of Ottawa

    lead OTHER

Study Design

Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Model
CROSSOVER

Eligibility

Min Age
9 Years
Max Age
25 Years
Sex
FEMALE
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2026-07-21
Primary Completion
2027-04-30
Completion
2027-06-30

Countries

  • Canada

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07781592 on ClinicalTrials.gov