Anyone suffering from a sports injury knows that one must put ice on the area immediately. Moreover, the recommended icing time is 20 -minute intervals. Assuming the structure for a muscular region shown in Figure P6.40, is there any reason behind this 20-minute rule? How deep does the ice temperature penetrate into the body? 

Properties:

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kskin 0.37 W/m K kat = 0.37 W/m K kmuscle 0.41 W/m K - Cpskin = 3600 J/kg K Cpfat = 3600 J/kg K Cpuscle 3750 J/kg K = Pskin = 998 kg/m Pfat = 998 kg/m Pmuscle 1100 kg/m =