A novel method to measure skin mechanical properties with three-dimensional digital image correlation

Area of Science:

• Biomechanical Engineering
• Dermatology
• Optical Measurement Techniques

Background:

• Assessing skin mechanical properties is crucial for the skincare industry.
• Non-invasive optical techniques offer high accuracy in tracking skin deformation.
• Understanding skin biomechanics aids in product development and efficacy assessment.

Purpose of the Study:

• To evaluate the efficacy of Digital Image Correlation (DIC) in measuring skin mechanical properties.
• To compare DIC metrics with conventional instruments like the Cutometer®.
• To investigate the reproducibility and sensitivity of the DIC method for skin analysis.

Main Methods:

• A study involving female subjects (25-65 years old) utilized DIC with a refined speckle pattern.
• Skin deformation was quantified under unidirectional force application.
• DIC measurements were performed alongside Cutometer® readings for comparative analysis.

Main Results:

• DIC successfully clustered subjects based on statistically significant differences in six key mechanical property metrics.
• Measurement random errors were consistently below 6%, significantly smaller than observed inter-subject variations.
• Several DIC displacement metrics demonstrated good agreement with Cutometer® parameters.

Conclusions:

• Digital Image Correlation (DIC) is a viable method for differentiating skin with varying mechanical qualities.
• DIC metrics provide novel insights into skin biomechanics, complementing existing assessment tools.
• Advantages of DIC include accurate measurements, large analysis areas, and direct visualization.