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KMID : 0351619670080010001
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Kyungpook Medical Journal
1967 Volume.8 No. 1 p.1 ~ p.14
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ELASTICITY OF HUMAN SKIN
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Abstract
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The various previous methods for measurement of skin elasticity seem to be unsatisfactory in the light of the correctness and applicability. For this reason, a new method for measurement of skin elasticity in human subjects was deviced and its reliability was tested. A circular cup, plexiglas made, inside diameter of 29 mm, is glued tightly on the skin of upper forearm. A definite amount of the normal saline filled in the cup is withdrawn successibly up to the total amount of 1.6 ml and thereafter the saline is reintroduced into the cup. The negative pressure created in the cup by the volume change Is recorded with transducer-recorder system in the groups of boys, young males, young females, old males and older males. The results obtained are summerized as follows.
1. The general shape of the pressure-volume curve of skin is parabolic ; the stretch of the skin is nearly linear under the low pressure range and lasser under the high pressure.
2. The pressure-volume curves of skin reveal a phenomenon of hysteresis ; considerable time is required for complete stretching under a pressure being longer time for higher pressure, higher pressure is required for stretching the skin at the increasing pressure by withdrawing the fluid in the cup than that at the decreasing pressure under the same cup volume.
3. The relationships between pressure and skin excursion ; pressure and degree of stretching ; pressure and tension developed in the stretched skin ; degree of stretching and tension of skin were obtained in each group of subjects.
4. The concept of compliance was introduced to evaluate the distensibility of the skin. The values of compliance, m1/cmH₂O, for the circular skin of 29mm in diameter, calculated in each group are about ; boys, 0.08 ; young male, 0.04 ; young ; female, 0.1 ; old male, 0.05 ; older male, 0.1.
5. The Young moduluses of skin in each group of subjects calculated from the tension-length curves and the estimated skin thickness are ranged from 3×10^(6) to 8×10^(6) dynes/㎠. And the Young modulus in a excised cadaver skin determined from the actually measured values is about 8×10^(6) dynes/㎠. This suggests that the value of Young modulus estimated in intact subjects by the proposed method is probably close to the real value.
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KEYWORD
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