消費者使用含傳明酸化粧保養品
對其皮膚狀況變化自覺之研究

研究背景：傳明酸及維他命C衍生物在臨床已證實具有美白成分，為化粧保養品中允許添加之物。目前鮮少研究探討消費者在化粧保養品介入後，對於其自覺感受及實際膚質狀況改變量的差別。研究目的：本研究主要探討消費者在化粧保養品使用前後對其自覺膚質狀況及實際膚質狀況改變量的差別。研究方法：本研究以追蹤型研究法(longitudinal study)，調查30-65歲女性於化粧保養品使用前後自覺及實際膚質狀況的改變量。每位受測者於化粧保養品使用前接受問卷調查及VISIAR膚質檢測：連續使用化粧保養品八週後再進行一次問卷調查及VISIAR膚質檢測，最後追蹤完成者有40位。以Paired t方法檢定化粧品介入前後對自我感覺膚質的變化量及膚質檢測儀測量的改變量的情況，並以Cohen’s Effect Size(ES)計算自我感覺與膚質檢測儀測量的膚質前測及後測改變的效果值。研究結果：在使用化粧保養品後，受測者在斑點（ES=0.22）、皺紋（ES=0.24）、紋理（ES=0.31）及毛孔（ES=0.21）皆達顯著性減少。在自覺膚質狀況方面，受測者在化粧保養品使用後自覺有膚色不均問題（ES=0.75）、皮膚不平滑問題（ES=0.76）、皮膚發紅問題（ES=0.41）、皺紋問題（ES=0.58）及毛孔粗大（ES=0.75）等問題皆達顯著性減少。結論：本研究發現美白化粧保養品使用，除可改善實際膚質狀況，同時也可讓使用者感受到膚質狀況的改變，此研究結果可作為未來化粧品相關研究的參考資訊。關鍵字：美白；自覺；化粧品；皮膚

關鍵字

美白；自覺；化粧品；皮膚

並列摘要

Background: Tranexamic acid and vitamin C derivatives are important reagents in cosmetic skin-whitening products. There is however limited research focusing on the difference of objective testing and consumers’ self-perceived facial skin status when they use whitening cosmetic products. Aims: The purpose was to determine the responsiveness of objective testing and consumers’ self-perceived facial skin status when they use whitening cosmetic products. Methods: A total of 40 volunteers were photographed using the VisiaR machine and completed questionnaires at pre- and post-operation (8 weeks after receiving whitening cosmetic products). VisiaR digital image analysis and questionnaires were used for assessment of facial skin status. The responsiveness of objective and self-perceived measures was assessed by paired t test and Effect Size (ES). Results: There were improvements with regard to the surface spot (ES=0.22), wrinkles (ES=0.24), texture (ES=0.31) and pores (ES=0.21) after using cosmetic products. For self-perceived measures, there were significant improvements in pigmented spots (ES=0.75), rough complexion (ES=0.76), red complexion (ES=0.41), wrinkle (ES=0.58) and obvious pores (ES=0.75). Conclusions: This study suggests that the whitening cosmetic product is associated with improvements of objective testing and consumers’ self-perceived facial skin status. The results could be provided as available information for cosmetic investigations in the future. Key words: whitening; self-perceived; cosmetic; skin