Effect of Cardiorespiratory Fitness Level on Physiological Responses and Task Performance During a High-Rise Firefighting Task

Abstract

Objectives To determine the impact of cardiorespiratory fitness (CRF) on physiological and performance outcomes during a 120-m vertical high-rise ascent in firefighters with CRF levels at or above (higher-fit (HF)) and below (lower-fit (LF)) the national recommended minimum physical employment standard ( O2max 42.3 ml·kg-1·min-1). Methods Twenty-eight firefighters completed two high-rise firefighting trials (continuous and discontinuous ascent with pre-determined 1-min rest breaks). Task time (TT), heart rate (HR), ratings of perceived exertion (RPE), core body temperature (CT) and thermal comfort (TC) were recorded at predetermined elevations. Results TT was significantly longer in both trials for the LF group. RPE and TC were also significantly higher in the LF group, with three times more LF firefighters being unable to complete the ascent without sounding their low-air alarm. Conclusions Higher CRF improves performance and efficiency during stair-climbing in simulated high-rise firefighting tasks.