Abstract: The heart rate of participants and air consumption rate of breathing apparatus were monitored in real time under different fatigue levels and five typical tactical moves. The tactical moves were loaded traveling on a flat ground, low-posture searching, stretcher carrying, traveling in a confined space, and loaded stair climbing. As demonstrated by the results, the air consumption rate increased with increasing fatigue level and peaked at 3.02 MPa/min for loaded stair climbing under fatigue level Ⅴ; Meanwhile, the service life of the breathing apparatus was the shortest at approximately 9.93 min. A fire scenario simulation was conducted based on experimental data to solve the problem of significant differences between the actual and theoretical usage times of air respirators.

Key words: tactical movements, air breathing apparatus, air consumption rate, heart rate analysis