Body Solid Seated
Body Solid Seated
If your hands are currently receiving burns in a fire automatic, can you loosen your seat belt?
This question relates to fire safety in motor racing. Quick background: Costumes Fire / gloves / etc. receive a standardized "IFC" notation. The lowest score IFC (IFC-1) gives you three seconds the protection of a second degree burn in a 1800 degree fire – a fire of typical gasoline. SFI-5 gives you ten seconds, IFC-10 gives you nineteen seconds, etc. I heard that if your hands are receiving burns, your hand will curl into a fist, which leaves you unable to loosen your seat belt. I ask my race series to change their rules by increasing the heat to low suit and notes glove SFI SFI-1 to-5. We recently had a pilot died when he was trapped in his burning race car. My question is … Is the hand Curling true? If so, what are the technical / medical procedures for this situation? I want to present solid information for the organization sanctioning when I ask the increased protection of racing gloves. Jeff Abilene, TX
I would say that this could be due to the same reaction you get when you die. Rigor Mortis. Instead of coming slowly, the fire accelerates the reaction. It would be more because of the fire damaged the muscles that control the hand are located in the forearm. As the fire kills the muscle of the biochemical reactions in muscle would lead them to contract – And freezing fingers. Instead of a fist, I think the fingers remain straight and stiff, unable to move the flexor and extensor muscles acting against each others. The biochemical cause of rigor mortis is hydrolysis of ATP, the source of chemical energy necessary for movement in the muscle tissue. Myosin molecules devoid of ATP become permanently adherent to actin filaments to form actomyosin complex, causing muscles to become rigid. After the pH of the muscle has become 5.5, release of autolytic enzymes stored in lysosomes takes place. Proteolytic enzymes are major cathepsins and calpain. These enzymes act at the myofibrillar proteins and hydrolyse. Consequently, the actomyosin complex is broken down and the muscles become "Soft" again. This is known as resolution of rigor. Http://en.wikipedia.org/wiki/Rigor_mortis your local medical examiner would be a better source information and I am sure they would be happy to help.
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