Heat, Heat Stress
Conditions
Keywords
ultra-endurance
Brief summary
Military personnel are called upon to serve in hot, dry or humid climates, which places great demands on their ability to tolerate heat. Induced heat stress can impair performance and lead to pathologies. Faced with the challenges of global warming, this issue is becoming increasingly important in the practice of sport. While hyperthermia is known to impair endurance performance, the underlying thermophysiological responses and regulatory mechanisms during prolonged exercise remain poorly understood. The effects of hyperthermia on mental performance raise questions about the degradation of interoceptive capacities and the deleterious impact on behavioral regulation, an important component of thermal risk management in ultra-endurance exercise. What's more, despite the muscular and hydromineral consequences (rhabdomyolysis, renal failure, dehydration) of prolonged exercise, few data are available on recovery kinetics. A better understanding of the factors conditioning recovery quality could help limit the deleterious consequences of ultra-endurance exercise.
Interventions
OTHERPassive heat exposure
Participants will be exposed to heat in a chamber.
OTHERActive heat exposure
Participants will participate to a 6-hour run.
Sponsors
Direction Centrale du Service de Santé des Armées
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to 37 Years
Healthy volunteers
Yes
Inclusion criteria
* Healthy individuals * BMI between 18 and 25 kg/m2 * Weight ≥ 51 kg * Minimum training volume 6 days/7, aerobic * Participation in a running competition ≥ 6hours * Having given informed consent
Exclusion criteria
* Presence or history of medical pathology * Presence of significant deviation from normal electrocardiogram values * History of heat stroke * Known intolerance to heat * Inability to swallow a capsule or refusal of rectal probe * Alcohol consumption exceeding the equivalent of 3 glasses of wine per week * Consumption of narcotics * Smoking \> 0.5 pack of cigarettes per day * On usual medication * Pregnant or breast-feeding women * Protected adult, under legal protection, guardianship or curatorship, or unable to give personal written consent
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Degree of correlation between core temperature measured at the end of passive heat exposure and that measured at the end of active heat exposure | Through study completion (1 month) | Core temperature will be measured in every participants at the end of passive heat exposure and at the end of active heat exposure. A correlation analysis will be performed on these measurements. |
Countries
France
Outcome results
None listed