BLOOD FLOW IN FACIAL SKIN 505 Table III Correlation Coefficients Between Blood Flow Parameters and Surface Parameters on the Forehead Linear Correlation coefficient Exponential Blood flow parameters Parameters No. in group F .... Fi ..... I• F,,in F,,•x Fp .... :L 0.105 0.004 -0.032 0.063 0.089 sWa 40 0.118 0.063 0.000 0.094 0.118 0.089 0.055 0.055 0.095 0.089 sWP 40 0.104 0.077 0.100 0.134 0.130 0.145 0.126 0.063 0.110 0.126 sWt 40 0.148 0.134 0.104 0.130 0.148 0.105 0.045 -0.032 0.063 0.089 sWq 40 0.118 0.063 0.000 0.094 0.118 RELATIONSHIP BETWEEN BLOOD FLOW AND SURFACE MORPHOLOGY IN THE CHEEK Table IV shows the correlations between the blood flow parameters and surface mor- phology parameters of the cheek. Significant negative correlations were observed be- tween the surface morphology parameters sWp and sWt and all blood flow parameters, between sWa and all blood flow parameters except parameter Fmi n and Fpost_L , and between sWq and parameter Fmi n. Figure 4 shows the relationship between the surface morphology parameter sWp and the blood flow parameter Finter_L, which showed the highest correlation, in the cheek. Figure 5 shows the relationship between the surface morphology parameters sWa and the blood flow parameter Frest. Figure 6 shows close-up photographs of representative replicas. Table IV Correlation Coefficients Between Parameters of Blood Flow and Surface Parameters in the Cheek Parameters No. in group F .... Linear Correlation coefficient Exponential Blood flow parameters Fmter-L Fmin Fmax Fpost-L -0.298 sWa 40 -0.362* -0.401'* sWp 40 -0.476*** -0.373* sWt 40 -0.459*** -0.055 sWq 40 -0.187 -0.255 -0.195 -0.221 -0.217 -0.311' -0.235 -0.257 -0.253 -0.404** -0.378* -0.356* -0.349* -0.510'*** -0.509**** -0.429*** -0.432*** -0.367* -0.336* -0.327* -0.324* -0.479*** -0.458*** -0.406** -0.410'* 0.134 0.310' 0.000 0.032 0.148 -0.130 -0.089 *p 0.05' **p 0.01 ***p 0.005 ****p 0.001.

506 JOURNAL OF COSMETIC SCIENCE 300[ ß y = 142.63 * 10^(-7.4730e-3x) r= •.510 200 ]© 10 20 30 40 50 60 Blood flow parameter Finter-L Figure 4. Relationship between the surface morphology parameter sWp and the blood flow parameter Fi ..... L in the cheek. 100' 80' 60' 40' S1 y = 26.707 * 10^(-3.4332e-3x) r=- -0.362 0 20 40 60 80 100 Blood flowparameter Frest Figure 5. Relationship between the surfacemorphology parametersWa and the blood flow parameter in the cheek. RELATIONSHIP BETWEEN BLOOD FLOW IN THE CHEEK AND SKIN MORPHOLOGY IN PERIPHERAL REGIONS Table V shows correlations between the blood flow parameters in the cheek and the surface morphology parameters in several peripheral regions of the cheek (e.g. the corner of the mouth, the nasolabial groove, the lower eyelid, and the outer corner of the eye). No correlation was observed in the lower eyelid, in the nasolabial groove, or in the outer corner of the eye. Correlations were observed in many blood flow parameters (but not in Fmin) at the corner of the mouth. Figure 7 shows the relationship between sWq and the blood flow parameter Fma x at the corner of the mouth. RELATIONSHIPS BETWEEN SKIN ELASTICITY, BLOOD FLOW PARAMETERS, AND THE SKIN MORPHOLOGY OF THE CHEEK The elasticity of the cheek skin did not correlate with any of the blood flow or mor- phological parameters (data not shown). RELATIONSHIPS BETWEEN THE WATER CONTENT OF THE STRATUM CORNEUM, BLOOD FLOW PARAMETERS, AND THE SKIN MORPHOLOGY OF THE CHEEK The water content of the stratum corneum of cheek skin showed no correlation with any of the blood flow or morphological parameters (data not shown).