Study of Thermoregulatory Processes in Ultra-endurance Runners in a Hot and Humid Environment

NCT ID: NCT05098925

Last Updated: 2022-04-01

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 80 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2021-10-19
• Study Completion Date: 2021-12-31

Brief Summary

Human beings are characterized by their extraordinary ability to thermoregulate.

During a physical exercise, only 20% of the energy provided by the substrates is converted into muscular mechanical work. The remaining 80% is released as heat. In temperate environments, so-called metabolic heat is dissipated by several physical phenomena (radiation, conduction, convection and evaporation). However, if the dissipation capacity (in a hot and humid environment for example) is lower than the production of metabolic heat, the body temperature increases progressively until exercise stops or heat-related pathologies develop. This pathological entity defined by the acronym EHI for Exertional Heat Illness gather a wide spectrum of clinical forms ranging from oedema or heat rash, to muscle cramps, to syncope; up to more serious forms such as heat exhaustion or heat stroke during exercise.

Heatstroke during exercise is the second most common cause of death in athletes after heart disease.

However, the results of the epidemiological studies and the recommendations are limited to events with effort durations or distances not exceeding those of the marathon. They therefore do not consider ultra-endurance disciplines.

These disciplines, defined by durations of effort of at least 6 hours, have specific characteristics (duration of effort, intensity, steep gradients, exotic destinations, extreme environments) which means that extrapolation of the results and knowledge of the physiology of thermoregulation from "classic" endurance events, such as marathons, to ultra-endurance events is hazardous. There are therefore significant areas of uncertainty in understanding the thermoregulatory function, prevalence of EHI (Exertional Heat Illness) and health implications of ultra-endurance running in a hot environment. This is the context of ERUPTION-2.

Conditions

Intensive Sport

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: PREVENTION
• Blinding Strategy: NONE

Study Groups

Intervention

Study of Thermoregulatory Processes in Ultra-endurance Runners in a Hot and Humid Environment

Group Type: EXPERIMENTAL

Biological testing

Intervention Type: OTHER

Blood sampling, microcapillary sampling, temperature monitoring, saliva testing, EHI questionnaire

Interventions

Biological testing

Blood sampling, microcapillary sampling, temperature monitoring, saliva testing, EHI questionnaire

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• Runners participating in " La diagonale des fous " race of the "Grand Raid" 2021 on Reunion Island

Exclusion Criteria

• Runners who do not understand French

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Centre Hospitalier Universitaire de la Réunion

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Nicolas Bouscaren, MD

Role: PRINCIPAL_INVESTIGATOR

Centre Hospitalier Universitaire de La REUNION

Locations

CHU Réunion

Saint-Denis, , Reunion

Countries

Reunion

Other Identifiers

2021/CHU/25

Identifier Type: -

Identifier Source: org_study_id