Clinical trial NCT05098925: Study of Thermoregulatory Processes in Ultra-endurance Runners in a Hot and Humid Environment
Official title: Study of Thermoregulatory Processes in Ultra-endurance Runners in a Hot and Humid Environment
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Intensive Sport
Lead sponsor: Centre Hospitalier Universitaire de la Réunion
Sponsor class: OTHER
First posted: 2021-10-28
Enrollment: 80
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: PREVENTION

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.


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

Primary outcomes:
measure: Core temperature measurement
timeFrame: during 3 days of the race
measure: Natremia measurement
timeFrame: during 3 days of the race
measure: Hydration saliva measurement
timeFrame: during 3 days of the race
measure: Hydration by weight measurement
timeFrame: during 3 days of the race
Secondary outcomes:
Other outcomes:
Locations:
city: Saint-Denis
country: Réunion
facility: CHU Réunion
Study officials:
affiliation: Centre Hospitalier Universitaire de La REUNION
name: Nicolas Bouscaren, MD
role: PRINCIPAL_INVESTIGATOR
References: