METHOD FOR EVALUATING SKIN STIFFENING EFFECT

摘要

PROBLEM TO BE SOLVED: To obtain high correlative relation with sensory evaluation and also to easily attain measurement by measuring the thickness of skin. SOLUTION: Skin consists of three layers, that is, a cuticle, a corium and a hypodermis. The total thickness of the three is measured and a skin stiffening effect is evaluated by the increase and decrease rate. It is favorable that the total thickness of the cuticle and the corium among them is measured since correlation with a skin stiffening feeling by human sense is high and, especially, the measurement of the thickness of the corium is favorable. Measurement is easily attained in vivo by a method for analyzing an image through the use of an ultrasonic wave measuring instrument as the one for measuring skin thickness and it is favorable as precision is high. The increase and decrease rate in skin thickness measured in this way is provided with high correlative relation with the skin stiffening feeling. The feeling is increased when skin becomes thinner and it is lost when skin becomes thick.