Mathematical model to estimate the increase in firefighters’ core temperature during firefighting activity with a portable calorimeter

We developed a mathematical model to estimate the increase in firefighters’ core body temperature from energy expenditure (EE) measured by accelerometry to prevent heat illness during firefighting. Wearing firefighter personal protective equipment, seven male subjects aged 23–42 years underwent a graded walking test on a treadmill while esophageal temperature (Tes) and skin temperature were measured with thermocouples and EE was measured with a...