Thermal modulation of skin friction at the finger pad.
Thermal modulation of skin friction at the finger pad.
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DOI：
10.1016/j.jmbbm.2023.106072
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发表时间：
2023-08
影响因子：
3.9
通讯作者：
A. Valenza;K. Rykaczewski;Daniel M. Martinez;A. Bianco;S. Caggiari;Peter R. Worsley;D. Filingeri
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文献类型：
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作者：
A. Valenza;K. Rykaczewski;Daniel M. Martinez;A. Bianco;S. Caggiari;Peter R. Worsley;D. Filingeri
初步人体研究表明，降低皮肤温度可以最大限度地降低机械引起的皮肤损伤的风险。然而，冷却增强皮肤对压力和剪切力的耐受性的机制仍然知之甚少。我们假设皮肤冷却到热中性条件以下将减少皮肤-材料界面的动摩擦。为了检验我们的假设，我们测量了 8 名健康年轻人 (29±5 岁) 的热预处理食指垫在正常负载 (5N) 下在保持在三种不同温度（38、24 和 16°C）的板上滑动的摩擦系数。为了量化皮肤组织的温度分布，我们使用 3D 表面扫描和光学相干断层扫描来开发具有解剖学代表性的手指热模型。我们的组级数据表明，具有热影响组织（深度达 8 毫米）的滑动手指在板温度为 16°C（即下降 32%）和 24°C（即下降 13%）时所经历的摩擦力分别显着低于 38°C 时的摩擦力 (p<0.01)。这种现象在参与者中一致发生（即 N = 6/8，75%），并且在滑动过程中皮肤水合作用没有大的变化。我们互补的实验和理论结果为皮肤摩擦的热调节提供了新的见解，可用于开发热技术以在机械载荷和剪切下保持皮肤的完整性。
Preliminary human studies show that reduced skin temperature minimises the risk of mechanically induced skin damage. However, the mechanisms by which cooling enhances skin tolerance to pressure and shear remain poorly understood. We hypothesized that skin cooling below thermo-neutral conditions will decrease kinetic friction at the skin-material interface. To test our hypothesis, we measured the friction coefficient of a thermally pre-conditioned index finger pad sliding at a normal load (5N) across a plate maintained at three different temperatures (38, 24, and 16 °C) in 8 healthy young adults (29±5y). To quantify the temperature distribution of the skin tissue, we used 3D surface scanning and Optical Coherence Tomography to develop an anatomically representative thermal model of the finger. Our group-level data indicated that the sliding finger with thermally affected tissues (up to 8 mm depth) experienced significantly lower frictional forces (p<0.01) at plate temperatures of 16 °C (i.e. 32% decrease) and 24 °C (i.e. 13% decrease) than at 38 °C, respectively. This phenomenon occurred consistently across participants (i.e. N = 6/8, 75%) and without large changes in skin hydration during sliding. Our complementary experimental and theoretical results provide new insights into thermal modulation of skin friction that can be employed for developing thermal technologies to maintain skin integrity under mechanical loading and shearing.