Ergonomic Requirements and Fit Testing
topic
EN 469 and NFPA 1971 ergonomic requirements include minimum range of motion measurements for arm raise, forward bend, and squat movements performed by human test subjects wearing the complete clothing ensemble, with minimum acceptable range of motion percentages compared to baseline unclothed measurements ensuring that clothing bulk and stiffness do not impair firefighter mobility to levels compromising operational capability or increasing injury risk during firefighting activities.
Role
Ensures that thermal protection is provided without the mobility restriction that would impair firefighter performance and safety during search and rescue, hose advancement, and ladder climbing operations where restricted movement increases physical effort, fatigue rate, and injury risk, with ergonomic testing addressing the fundamental tension between maximising thermal insulation through additional batting layers and maintaining the mobility and dexterity required for effective structural firefighting.