Heat stiffening, : Occurs at temperature above 65C. Much more intense than rigor mortis.
Heat causes stiffening of the muscles, because the tissue preoteins are denatured and coagulated. The stiffening remains until the muscles and ligaments soften from decomposition and the normal rigor mortis does not occur.
Cold stiffening,: When a body is exposed to freezing temperatures, the tissues become frozen and stiff due to freezing of the body fluids and solidification of subcutaneous fat simulating rigor.If the body is placed in a warm atmosphere, the stiffness disappears and after a time, the normal rigor mortis occurs rapidly and passes off quickly.
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