LG Household & Health Care (LG H&H), Seoul, Korea.
Skin Res Technol. 2021 Nov;27(6):1017-1022. doi: 10.1111/srt.13051. Epub 2021 Jun 3.
Reduction in skin elasticity due to aging causes skin sagging and wrinkles. Although there are various objective and reliable techniques for measuring skin elasticity, it is difficult to obtain a visual representation of skin elasticity with them. Therefore, we developed a novel device, the Swing anglemeter, and analyzed its effectiveness for measuring skin elasticity of the cheek.
Forty-five healthy Korean women (age, 23-60 years) participated. The Swing anglemeter works by dropping a rubber ball on a subject's cheek, which draws a curve as it collides with the cheek. After recording the movement of the ball using the slow-motion function on a mobile phone, we defined the maximum angle at which the ball bounces off the skin as the elastic angle, using frame-by-frame video analysis. Changes in the elastic angle were assessed according to age, and correlation with the Ballistometer results (Dia-stron Ltd., Andover, UK) was analyzed for validation.
Elastic angles differed significantly (P < .001) according to age. A negative correlation was found between the elastic angle and age (r = -.799, P < .001). Compared with the Ballistometer measurements, the elastic angle was negatively correlated with alpha (r = -.570, P < .001); it was positively correlated with the mean coefficient of restitution and area (r = .602, P < .001 and r = .535, P < .001, respectively).
The elastic angle is a useful parameter for reflecting skin elasticity, both quantitatively and visually. Our method can help subjects understand their skin elasticity status. Therefore, we expect the device will be utilized in various fields within the cosmetic industry.
由于衰老导致皮肤弹性降低，会引起皮肤松弛和皱纹。虽然有各种客观可靠的技术可以测量皮肤弹性，但很难用这些技术来直观地表示皮肤弹性。因此，我们开发了一种新型设备——Swing 角度计，并分析了其测量脸颊皮肤弹性的有效性。
共有 45 名健康的韩国女性（年龄 23-60 岁）参与了研究。Swing 角度计的工作原理是让一个橡胶球落在受试者的脸颊上，当球与脸颊碰撞时，它会画出一条曲线。使用手机的慢动作功能记录球的运动后，我们将球反弹离开皮肤的最大角度定义为弹性角度，通过逐帧视频分析来确定。根据年龄评估弹性角度的变化，并分析与 Ballistometer 结果（Dia-stron Ltd.，Andover，UK）的相关性以进行验证。
弹性角度根据年龄差异显著（P <.001）。弹性角度与年龄呈负相关（r = -.799，P <.001）。与 Ballistometer 测量值相比，弹性角度与 alpha 呈负相关（r = -.570，P <.001）；与平均恢复系数和面积呈正相关（r =.602，P <.001 和 r =.535，P <.001）。
弹性角度是反映皮肤弹性的有用参数，既可以定量反映，也可以直观反映。我们的方法可以帮助受试者了解自己的皮肤弹性状况。因此，我们预计该设备将在化妆品行业的各个领域得到应用。
