Exercise in Extreme Hot Weather Conditions

Background: Core body temperature increases in hot climates due to exercise workload, disrupting heat gain and loss of balance. The human thermoregulatory system regulates core body temperature through factors such as metabolic heat production, air temperature, humidity, and clothing. The study investigates physiological thermoregulatory responses in semiprofessional athletes during walking and jogging in different climatic conditions. Methods: A factorial experimental interventional design was used to evaluate different physical activity (low (L)=5 km/h and high (H)=8 km/h) and climatic conditions within the Thermal Environment Laboratory at Lund University, Sweden. The temperature within the climatic chamber was set at 40°C and 31°C, with a relative humidity of 20% and 70%, (hot dry (HD) and hot humid (HW), respectively, to account for a 28°C WBGT. The study used independent T-tests, ANOVA and simple linear regression models to analyse the physiological responses of semiprofessional athletes under different test conditions, comparing gender differences.

NCT Number	NCT07307391
Lead Sponsor	University of Valladolid
Conditions	Heat Acclimation and Thermotolerance, Heat Effect
Enrollment	6 participants
Start Date	2025-07-07
Primary Completion	2025-12-10 (estimated)
Study Completion	2025-12-12 (estimated)
Updated on ClinicalTrials.gov	2025-12-31