Por invitaciónNCT07781592Registro de ClinicalTrials.gov

Exercise Intensity and Heat Responses in Children and Youth

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

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LO ESENCIAL

De qué trata este estudio

El registro no identifica actualmente este estudio como reclutando. Consulta su estado antes de planificar una evaluación.

Tipo de estudio: De intervención
Fase: No aplica
Rango de edad: 9 años - 25 años
Sexo admitido: Femenino
Voluntarios sanos: Aceptados
Participantes: 12 Estimado

Estos son puntos de partida, no una decisión de elegibilidad. El equipo debe revisar todos los requisitos.

Las explicaciones y la navegación están en español. Los textos proporcionados por el registro, incluidos títulos, resúmenes y criterios, se conservan en su idioma original. Puedes pedir orientación en español a WCR.

Acerca de la investigación

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.

¿Quién podría participar?

La lista siguiente contiene el texto del patrocinador. Puede incluir condiciones, tratamientos previos, resultados de pruebas y otros requisitos. Aparecer en tu búsqueda no significa que califiques.

Inclusion Criteria:

Healthy male or female.
Aged 9-16 years or 20-25 years.
Habitually active, defined as participating in regular physical activity at least 3 times per week for at least 20 minutes per session over the previous 6 months.
Able to understand and communicate in English or French.
For participants younger than 18 years, written parental or guardian consent and participant assent are required.

Exclusion Criteria:

Acute illness at the time of testing (e.g., cold, flu, or infection).
History of a chronic medical condition that may affect thermoregulation, cardiovascular function, or exercise capacity (e.g., cardiovascular disease, metabolic disorders, respiratory disease including asthma requiring regular medication, or neurological disorders).
Use of medications known to affect thermoregulation, hydration status, or cardiovascular responses.
History of heat-related illness (e.g., heat exhaustion or heat stroke).
Digestive abnormalities or gastrointestinal conditions that may contraindicate ingestion of a telemetry pill.
Any condition that, in the opinion of the investigators, would compromise participant safety or the integrity of the data.

Entiende la evaluación inicial

Tratamiento, grupos y participación

El registro puede describir tratamientos y duración sin incluir un calendario completo. Pide al equipo las visitas, procedimientos, riesgos, costos y alternativas. Mantén tu atención habitual salvo que tu médico te indique un cambio.

Asignación: Asignación al azar
Enmascaramiento: Sin enmascaramiento

Low-intensity exercise

Participants will complete intermittent light-intensity exercise in a hot environment of 36°C (degree Celsius (97°F, degree Fahrenheit)). Exercise will be performed at a metabolic heat production of 120 W/m² (W=watts; m=meter) and will consist of four 15-minute exercise periods separated by 15-minute rest periods. Exercise workload will be individually adjusted to achieve the prescribed metabolic heat production.

Other: Low-Intensity Exercise in the Heat

Moderate-intensity exercise

Participants will complete intermittent moderate-intensity exercise in a hot environment of 36°C (97°F). Exercise will be performed at a metabolic heat production of 160 W/m² and will consist of four 15-minute exercise periods separated by 15-minute rest periods. Exercise workload will be individually adjusted to achieve the prescribed metabolic heat production.

Other: Moderate-Intensity Exercise in the Heat

Vigorous-intensity exercise

Participants will complete intermittent vigorous-intensity exercise in a hot environment of 36°C (97°F). Exercise will be performed at a metabolic heat production of 200 W/m² and will consist of four 15-minute exercise periods separated by 15-minute rest periods. Exercise workload will be individually adjusted to achieve the prescribed metabolic heat production.

Other: Vigorous-Intensity Exercise in the Heat

Low-Intensity Exercise in the Heat OTHER

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)).

Moderate-Intensity Exercise in the Heat OTHER

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

Vigorous-Intensity Exercise in the Heat OTHER

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

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