| Properties | After normal sleep (baseline) | After sleep deprivation | p-value |
| Skin hydration (a.u.) |
|
|
|
| Cheek | 65.53 ± 2.15 | 62.00 ± 2.08** | 0.003 |
| Eye | 78.74 ± 1.78 | 77.00 ± 1.33 | 0.139 |
| Lip | 56.67 ± 1.45 | 46.35 ± 1.68*** | 0.000 |
| Transepidermal water loss (g/m2h) |
|
|
|
| Cheek | 22.97 ± 0.75 | 23.79 ± 0.73** | 0.002 |
| Eye | 19.56 ± 0.75 | 20.33 ± 0.80** | 0.001 |
| Elasticity (R7, a.u.) |
|
|
|
| Cheek | 0.343 ± 0.007 | 0.322 ± 0.007*** | 0.000 |
| Eye | 0.365 ± 0.013 | 0.353 ± 0.011* | 0.033 |
| Skin desquamation (pixel) |
|
|
|
| Cheek | 175550.83 ± 3318.48 | 180680.50 ± 3034.80** | 0.001 |
| Translucency (K, a.u.) |
|
|
|
| Cheek | 2356.46 ± 66.88 | 2262.90 ± 57.91** | 0.003 |
| Facial pore (pixel) |
|
|
|
| Cheek | 6173.54 ± 567.66 | 6713.00 ± 609.68* | 0.012 |
| Skin tone (L*, a.u.) |
|
|
|
| Cheek | 70.72 ± 0.60 | 70.00 ± 0.51* | 0.011 |
| Eye (dark eye circle) | 65.70 ± 0.94 | 65.54 ± 0.88 | 0.332 |
| Lip | 46.40 ± 0.61 | 46.30 ± 0.66 | 0.790 |
| Skin blood flow (a.u.) |
|
|
|
| Eye | 0.89 ± 0.04 | 0.74 ± 0.03*** | 0.000 |
| Lip | 1.94 ± 0.15 | 1.78 ± 0.11 | 0.160 |