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Objective:To measure the skin color parameters of Chinese women with non-invasive instruments test, and to validate assessment scales (VAS) and image analysis. Skin tone index (STI) of Chinese women was created by PLS-VIP method, and then used to the overall evaluation of Chinese women skin color.Methods:The skin color scale by VAS, parameters measured by tristumulus colorimeter, narrow-band-simple reflectance meter and image analysis were administered at the cheek of 60 famle subjects. The correlations among all the parameters collected by the instruments and scales by VAS were investigated, and then the main impact factors of skin color grade were analyzed. The STI model was created by principal component analysis and further tested.Results:With b value exception, skin color score was significantly correlated with the instrument parameters. The absolute values of coefficients were from 0.6898 to 0.8648. Int, L, BS, MI and EI were the most important parameters which influenced the consumer＇s perception of skin visual color. The SWI=0.47*Int+ 0.47*L+ 0.43*BS-0.44MI-0.43EI was created by PLS-VIP. The coefficient between SWI and skin color scale was -0.834 ( P<0.0001). Conclusions:STI could be effectively and comprehensively representative of the degree of skin color change.
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Objective To investigate the applicability of clinical grade and a non-contact measurement method in evaluation of underneath eye wrinkles and to compare two methods.Methods A lot of 46 healthy Chinese women were recruited for this study.Underneath eye wrinkles severity was evaluated using clinical grade and a non-contact measurement method.The correlations were calculated for clinical grade and non-contact measurement parameters and age.The non-contact measurement parameters were classified by factor analysis.The correlations between age,clinical grade and factors were analyzed.Results The correlation coefficient between clinical grade in comparison to subject's age was 0.818.The parameters getting from non contact measurement were obviously correlated with age and clinical grade except SEr and SEsc;the correlation coefficients between parameters and age were-0.601 to 0.605;the correlation cofficients between parameters and clinical grade were-0.630 to 0.570.The non-contact measurement parameters could be classified into two factors;one represented wrinkle depth and roughness;the other represented wrinkle width and counts.These two factors were also obviously correlated with age and clinical grade.Conclusions Clinical grade and non contact measurement methods are both applicable in evaluation of underneath eye wrinkles.The parameters getting from two methods are obviously correlated with each other.
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Objective To estimate the differences between face and hand skin and age correlation in females aged 23-46 years living in Shanghai.Methods 139 women aged 23-46 years from Shanghai attended this program.The water content,pH,TEWL and elasticity of cheek,forehead,hand back of and palm were evaluated by non-invasive skin test instruments.Results The skin water content of these four parts from high to low were forehead,cheek,hand back and palm,and they were different from each other significantly.The pH of cheek was the highest,and forehead was the lowest;there was no significant difference between hand back and palm.TEWL of palm was the high-est,and cheek was the lowest;the difference between forehead and hand back was inconsistent in different age groups.The elasticity of cheek was the highest.There was no significant difference in R2 between forehead,hand back and cheek.The condition of R5 and R7 was different between younger group and older group.In young group the cheek was the highest,and palm was the lowest.In older group,cheek and forehead,palm and hand back began to converge.In addition to the elasticity of cheek and hand back,other parameters of other parts had no significantly difference between different age groups,and also had no significant correlation.Conclusions The cheek has the best skin barrier,elasticity and the highest pH,and the elasticity of cheek decreases with age.The forehead has the highest water content and lowest pH,TEWL and the elasticity of hand back are close to the forehead,and the elasticity of hand back decreases with age.The palm has the highest TEWL and lowest water content.Its total recovery amount in the elastic curve is higher,but the elastic ratio in the recovery is the lowest.