Prueba de esfuerzo a 44°C y 80 % de humedad.del traje con hielo

humedad Summary Objective: to compare the fatigue in a stress test at high tem- perature and humidity in eight healthy volunteers. Methods: the time of pedaling in the ergometer cycle was mea- sured to know the exercises efficiency at 30 km/h until the vol- unteers presented exhaustion or their heart frequency increased > 160 beating per minute. A basal test in the tunnels ventilation of the Naica mine at 37.5 °C and 40 % of humidity was done. We repeat the stress test at the entrance of the cave, where temperature was 44 °C and 80 % of humidity. We compared using the protector equipment with ice and cold air breathing suit.