Physiological tests on firefighters whilst using protective clothing

Area of Science:

• Occupational Health and Safety
• Thermal Physiology
• Protective Clothing Technology

Background:

• Firefighter operations involve intense physical exertion and exposure to adverse thermal environments.
• Protective clothing properties can significantly impact a firefighter's ability to perform occupational tasks.
• Understanding the thermal burden imposed by different protective suits is crucial for firefighter well-being.

Purpose of the Study:

• To compare the heat load and physiological strain experienced by firefighters wearing two types of protective clothing.
• To evaluate the impact of ambient temperature on the thermal performance of barrack (B) and special-purpose (S) firefighter clothing.

Main Methods:

• Physiological heat strain parameters and subjective ratings were measured in a climate chamber.
• Tests were conducted with firefighters performing diversified effort while wearing B clothing and S clothing.
• Two ambient air temperatures were used: 20°C and 30°C.

Main Results:

• At 20°C, S clothing showed a small increase in physiological strain and subjective ratings compared to B clothing.
• At 30°C, the differences in physiological parameters and subjective ratings between S and B clothing were substantial.
• The watertight layer and protective structure of S clothing significantly impede the body's ability to dissipate heat.

Conclusions:

• Special-purpose (S) firefighter clothing imposes a greater heat burden, particularly at higher ambient temperatures.
• The design of S clothing, while offering protection, significantly hinders thermoregulation, increasing heat strain.
• Further research into advanced materials and designs is needed to mitigate heat stress in protective gear.