Impact of fabric moisture transfer properties on physiological heat strain of firefighters during simulated rescue training

The study was aimed at investigating the thermo physiological responses and the change of heat strain when wearing two different designs of uniform with specific fabric properties and PPE (Personal protection equipment) in rescue operation of firefighters. Method: 10 healthy male firefighters performed the training according to the guideline and procedure of formal training in Fire Services Department to simulate the actual rescue condition. In order to investigate the actual situation of the rescue operation, simulated high temperature and humid condition were controlled by the chamber. The existing PPE and two sets of uniforms, Set 1 and Set 2 were used in the study. Measurement: Core temperature, heart rate, micro-climate temperature and humidity, and mean skin temperature were collected in each study. PSI values was calculated using the formula developed by Moran. Result: The Core temperature, heart rate, skin temperature and micro-climate condition were increased significantly during the training sessions compared to the resting sessions. PSI values result in moderate to high levels of heat stain during the simulated firefighting activity.