Heat stress is one of the main factors for firefighters’ injuries. According to statistics, 70% of firefighters’ accidents in the United States are related to heat stress. Heat stress may cause firefighters to have serious consequences such as heat cramps, dehydration, increased burden on the cardiovascular system, nervousness, irritability, and decreased judgment. Therefore, foreign countries have started to monitor the changes in the physiological indicators of firefighters in firefighting simulation activities. Researching widely.
1. Studies have found that heat stress has a significant impact on the cardiovascular system of firefighters. With the accumulation of heat inside the fire suit, a lot of sweating will cause a decrease in blood flow, especially a decrease in plasma volume. At the same time, the increase in body temperature will cause vasodilation and increase the diameter of blood vessels, causing more blood to accumulate in the venous system and return. The blood of the heart is reduced, which leads to a rapid decrease in blood flow or blood pressure. The heart cannot provide enough blood to meet the needs of muscles, myocardium and brain for blood supply. It is easy to cause chest tightness and heart attacks. Heart disease is the death of firefighters. The main reason.
2. The Norwegian research institute found that the symptoms of chronic fatigue syndrome are very similar to the chronic symptoms of long-term workers under heat stress. Common symptoms include muscle discomfort, headache, collapse, language disorders, logic and memory disorders, and lack of concentration. Medical research has shown that continuous exposure to heat causes extreme fatigue.
3. Tests have shown that the heat stress generated by firefighting protective clothing during firefighting operations will cause the firefighters’ body temperature, heart rate, pulse, etc. to rise rapidly, and heat fatigue will accelerate; they are impatient, and the error rate of judgment of the situation is significantly increased; Electrolyte imbalance in the body and increased potassium, sodium and other elements may cause diarrhea, vomiting, kidney failure, etc.
It can be seen that the excessive thermal protection of firefighters by fire-extinguishing protective clothing is not conducive to the safety and health of firefighters. Therefore, the phenomenon of excessive thermal protection should be avoided as much as possible to effectively reduce the thermal damage caused to firefighters.