녹차 추출물의 피부 적용이 여드름 피부의 상태 변화에 미치는 영향

Abstract

ABSTRACT

The effects of green tea extracts to skin with acnes - Targering subjects who are female high school students -

Lim, Sun Hee Skincare and obesity management major Graduate school of lifetime welfare, Sungshin Women's University

This study did not experiment the changes that consuming green extract has made, but the changes that was made by applying it directly on to the skin.

This study was conducted throughout 8 weeks from May 27th to July 15th to high school girls residing in Seoul who has acne problems treated by green tea extracts, and those who were treated professionally. The differences in their skin conditions were compared in order to find out how green tea extracts fight against acne.

Subjects in this study were divided into two groups, 24 people who were treated professionally (control group) and 24 people who were treated with green tea extracts only (experimental group).

The test results are as follow.

1. Profile of the subjects Subjects are high school girls, experimental group with average age of 16.96 years, and control group with average age of 16.75 years; both groups of subjects are considered teen age girls. Experimental group has average height of 161.52cm and average weight of 57.46kg. Control group has average height of 162.38cm and average weight of 60.5kg. There are no significant difference found in their average age, height, and weight. In addition, there were no significant differences found in their life style and diet habits.

2. Subject’s skin awareness and skin managing habits Survey conducted before the study showed that they had more than average amount of interest in skin care, but most of them have never experienced professional skin care and did their skin care by themselves at home. Most of the subject answered that they use sun screens. 3. Conditions of subject’s skin Skin test conducted to the subjects before the study proved that there were no significant difference among the subjects in their oiliness in their T-zone and U-zone, roughness of the skin, wrinkles, pigment and sebum.

4. Changes made to subject’s skin After testing the oiliness of the subjects, it was found that experimental group’s U-zone has increased by 20.8%, but T-zone has decreased by 20.6%. Control group’s U-zone has increased by 54.0%, but T-zone has decreased by 16.7%. There were no significant difference statistically in U-zone, but T-zone did show some changes (p<0.01) and test showed that green tea extracts were comparably more effective at decreasing the amount of oil in T-zone.

In roughness test of the subjects, experimental group showed decrease of 11.1%, and control group showed 9.7% (p<0.01), test result shows that experimental group using green tea extracts had better results against roughness of the skin compared to the control group.

In the wrinkle test of the subjects, there were no significant difference found between two groups, but wrinkle seemed to be diminishing throughout the test in both groups (p<0.01).

In the pigment test of the subjects, both experimental and control group showed significant amount of decrease over the period of this test (p<0.05).

In the sebum test of the subjects, both experimental and control group showed significant amount of difference over the period of this test (p<0.001)., but only experimental group showed noticeable decrease at week 8.

5. Subject’s satisfaction after the study After conducting a survey of subject's satisfaction and comparing the results, pain in the skin (p<0.01), dryness of the skin, dead dry cell on the skin, skin swelling (p<0.05) statically showed significant changes. In area such as stinging on the skin, rashness on the skin, itchiness on the skin, skin troubles and future plan on professional skin care showed more satisfaction on experimental group.

The result of this test which is applying green tea extracts on to the skin to fight against skin with acne proved that green tea extract therapy has better satisfaction rate compared to other skin care therapy which causes pain and ache that discomfort users. Green tea extracts clearly has better result in the stand point of psychological view of users. It is believed that self care using green tea extracts is a very good alternative to professional skin care for teenagers who cannot afford expensive professional skin care.