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de Lucio M, Leng Y, Hans A, Bilionis I, Brindise M, Ardekani AM, Vlachos PP, Gomez H. Modeling large-volume subcutaneous injection of monoclonal antibodies with anisotropic porohyperelastic models and data-driven tissue layer geometries. J Mech Behav Biomed Mater 2023; 138:105602. [PMID: 36529050 DOI: 10.1016/j.jmbbm.2022.105602] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 11/22/2022] [Accepted: 11/29/2022] [Indexed: 12/13/2022]
Abstract
Subcutaneous injection of therapeutic monoclonal antibodies (mAbs) has become one of the fastest-growing fields in the pharmaceutical industry. The transport and mechanical processes behind large volume injections are poorly understood. Here, we leverage a large-deformation poroelastic model to study high-dose, high-speed subcutaneous injection. We account for the anisotropy of subcutaneous tissue using of a fibril-reinforced porohyperelastic model. We also incorporate the multi-layer structure of the skin tissue, generating data-driven geometrical models of the tissue layers using histological data. We analyze the impact of handheld autoinjectors on the injection dynamics for different patient forces. Our simulations show the importance of considering the large deformation approach to model large injection volumes. This work opens opportunities to better understand the mechanics and transport processes that occur in large-volume subcutaneous injections of mAbs.
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Affiliation(s)
- Mario de Lucio
- School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette IN 47907, USA
| | - Yu Leng
- School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette IN 47907, USA
| | - Atharva Hans
- School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette IN 47907, USA
| | - Ilias Bilionis
- School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette IN 47907, USA
| | - Melissa Brindise
- School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette IN 47907, USA
| | - Arezoo M Ardekani
- School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette IN 47907, USA
| | - Pavlos P Vlachos
- School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette IN 47907, USA
| | - Hector Gomez
- School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette IN 47907, USA.
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Yoshida Y, Matsumura N, Yamada Y, Yamada M, Yokoyama Y, Miyamoto A, Nakamura M, Nagura T, Jinzaki M. Three-Dimensional Quantitative Evaluation of the Scapular Skin Marker Movements in the Upright Posture. SENSORS (BASEL, SWITZERLAND) 2022; 22:6502. [PMID: 36080957 PMCID: PMC9460682 DOI: 10.3390/s22176502] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 08/22/2022] [Accepted: 08/26/2022] [Indexed: 06/15/2023]
Abstract
Motion capture systems using skin markers are widely used to evaluate scapular kinematics. However, soft-tissue artifact (STA) is a major limitation, and there is insufficient knowledge of the marker movements from the original locations. This study explores a scapular STA, including marker movements with shoulder elevation using upright computed tomography (CT). Ten healthy males (twenty shoulders in total) had markers attached to scapular bony landmarks and underwent upright CT in the reference and elevated positions. Marker movements were calculated and compared between markers. The bone-based and marker-based scapulothoracic rotation angles were also compared in both positions. The median marker movement distances were 30.4 mm for the acromial angle, 53.1 mm for the root of the scapular spine, and 70.0 mm for the inferior angle. Marker movements were significantly smaller on the superolateral aspect of the scapula, and superior movement was largest in the directional movement. Scapulothoracic rotation angles were significantly smaller in the marker-based rotation angles than in the bone-based rotation angles of the elevated position. We noted that the markers especially did not track the inferior movement of the scapular motion with shoulder elevation, resulting in an underestimation of the marker-based rotation angles.
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Affiliation(s)
- Yuki Yoshida
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Noboru Matsumura
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Yoshitake Yamada
- Department of Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Minoru Yamada
- Department of Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Yoichi Yokoyama
- Department of Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Azusa Miyamoto
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Masaya Nakamura
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Takeo Nagura
- Department of Orthopedic Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Masahiro Jinzaki
- Department of Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
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Diosa JG, Moreno R, Chica EL, Villarraga JA, Tepole AB. Changes in the three-dimensional microscale topography of human skin with aging impact its mechanical and tribological behavior. PLoS One 2021; 16:e0241533. [PMID: 34242217 PMCID: PMC8270165 DOI: 10.1371/journal.pone.0241533] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Accepted: 05/11/2021] [Indexed: 11/19/2022] Open
Abstract
Human skin enables interaction with diverse materials every day and at all times. The ability to grasp objects, feel textures, and perceive the environment depends on the mechanical behavior, complex structure, and microscale topography of human skin. At the same time, abrasive interactions, such as sometimes occur with prostheses or textiles, can damage the skin and impair its function. Previous theoretical and computational efforts have shown that skin's surface topography or microrelief is crucial for its tribological behavior. However, current understanding is limited to adult surface profiles and simplified two-dimensional simulations. Yet, the skin has a rich set of features in three dimensions, and the geometry of skin is known to change with aging. Here we create a numerical model of a dynamic indentation test to elucidate the effect of changes in microscale topography with aging on the skin's response under indentation and sliding contact with a spherical indenter. We create three different microrelief geometries representative of different ages based on experimental reports from the literature. We perform the indentation and sliding steps, and calculate the normal and tangential forces on the indenter as it moves in three distinct directions based on the characteristic skin lines. The model also evaluates the effect of varying the material parameters. Our results show that the microscale topography of the skin in three dimensions, together with the mechanical behavior of the skin layers, lead to distinctive trends on the stress and strain distribution. The major finding is the increasing role of anisotropy which emerges from the geometric changes seen with aging.
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Affiliation(s)
- Juan G. Diosa
- Mechanical Engineering Department, Universidad de Antioquia, Medellín, Colombia
| | - Ricardo Moreno
- Mechanical Engineering Department, Universidad de Antioquia, Medellín, Colombia
| | - Edwin L. Chica
- Mechanical Engineering Department, Universidad de Antioquia, Medellín, Colombia
| | - Junes A. Villarraga
- Mechanical Engineering Department, Universidad de Antioquia, Medellín, Colombia
| | - Adrian B. Tepole
- School of Mechanical Engineering, Purdue University, West Lafayette, Indiana, United States of America
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana, United States of America
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Wu Y, Tanaka T. Objective and quantitative measurement of skin micro-relief by image analysis and application in age-dependent changes. Skin Res Technol 2021; 27:1072-1080. [PMID: 34117804 PMCID: PMC9291164 DOI: 10.1111/srt.13060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 03/17/2021] [Accepted: 04/20/2021] [Indexed: 12/11/2022]
Abstract
BACKGROUND Skin micro-relief has been researched by a variety of devices and methods, which usually are expensive or complicated. On the other hand, skin micro-relief relates to quite a few parameters, and it is hard to evaluate all of them at the same time. In the study, all parameters related to skin micro-relief are extracted and evaluated by image analysis. MATERIALS AND METHODS Skin micro-relief evaluation was divided into four aspects: (a) Tamura features method was used to evaluate skin surface. (b) Morphological transform was applied to extract skin pores. (c) Watershed transform was applied to extract skin furrows. (d) labeling operation was used to evaluate the number, area and average area of skin closed polygons. Then, cheek images from 163 healthy Japanese females (0-70 years old) are analyzed to explore the age-dependent changes. RESULTS Most parameters increased as age went on with significant differences, such as skin surface coarseness, contrast, skin pore number, area, average area, skin furrow width, skin closed polygon area and skin closed polygon average area. Skin coarseness has a strong correlation with pore area. CONCLUSION The method proposed in the study provided a comprehensive and effective assessment of skin micro-relief.
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Affiliation(s)
- Yue Wu
- Graduate School of Science and Technology, Keio University, Yokohama, Japan
| | - Toshiyuki Tanaka
- Faculty of Science and Technology, Keio University, Yokohama, Japan
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5
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Skin Aging Estimation Scheme Based on Lifestyle and Dermoscopy Image Analysis. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9061228] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Besides genetic characteristics, people also undergo a process of skin aging under the influence of diverse factors such as sun exposure, food intake, sleeping patterns, and drinking habits, which are closely related to their personal lifestyle. So far, many studies have been conducted to analyze skin conditions quantitatively. However, to describe the current skin condition or predict future skin aging effectively, we need to understand the correlation between skin aging and lifestyle. In this study, we first demonstrate how to trace people’s skin condition accurately using scale-invariant feature transform and the color histogram intersection method. Then, we show how to estimate skin texture aging depending on the lifestyle by considering various features from face, neck, and hand dermoscopy images. Lastly, we describe how to predict future skin conditions in terms of skin texture features. Based on the Pearson correlation, we describe the correlation between skin aging and lifestyle, and estimate skin aging according to lifestyle using the polynomial regression and support vector regression models. We evaluate the performance of our proposed scheme through various experiments.
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6
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Lee K, Kim M, Kim K. 3D skin surface reconstruction from a single image by merging global curvature and local texture using the guided filtering for 3D haptic palpation. Skin Res Technol 2018; 24:672-685. [DOI: 10.1111/srt.12584] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/01/2018] [Indexed: 11/28/2022]
Affiliation(s)
- K. Lee
- 3D Information Processing Lab.; Department of Electronics and Information Engineering; Korea University; Seoul Korea
| | - M. Kim
- 3D Information Processing Lab.; Department of Electronics and Information Engineering; Korea University; Seoul Korea
| | - K. Kim
- Haptic Engineering Research Lab.; Department of Information and Telecommunication Engineering; Incheon National University; Incheon Korea
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7
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Moon C, Lee O. Age‐dependent skin texture analysis and evaluation using mobile camera image. Skin Res Technol 2018; 24:490-498. [DOI: 10.1111/srt.12459] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/04/2018] [Indexed: 11/28/2022]
Affiliation(s)
- C.‐I. Moon
- Department of Medical IT EngineeringCollege of Medical SciencesSoonchunhyang University Asan Korea
| | - O. Lee
- Department of Medical IT EngineeringCollege of Medical SciencesSoonchunhyang University Asan Korea
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8
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Kim DH, Oh GN, Kwon IH, Seo SH, Kye YC, Ahn HH. Relationship between skin color and solar elastosis in aged Asian skin: A colorimetric-pathologic correlation. Microsc Res Tech 2017; 80:1073-1077. [PMID: 28602047 DOI: 10.1002/jemt.22901] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2016] [Revised: 05/04/2017] [Accepted: 05/28/2017] [Indexed: 11/11/2022]
Abstract
Aged skin is reported to be associated with unattractive skin color changes and solar elastosis. However, comparative studies have not documented the possible correlation between the two factors. This study investigated the plausible relationship between the facial skin color of elderly Asians and solar elastosis. A total of 22 skin specimens were collected from 22 Korean patients who underwent cheek skin biopsies. Skin color was quantitatively measured using colorimetric photography techniques to produce CIE L*a*b* values; the degree of solar elastosis was quantifiably assessed using a histologic grading scale. These values were used to investigate a correlation between the CIE L*a*b* coordinates and solar elastosis grade. The solar elastosis grade increased according to patient age (r = 0.67, p = .0006). However, the extent of solar elastosis was not statistically correlated with the CIE L*a*b* values, including L*, a*, and b* (r = 0.02, p = .95; r = 0.15, p = 0.50; r = -0.07, p = 0.76, respectively). The results showed that the solar elastosis grade increased, according to patient age, because of cumulative actinic damage. However, colorimetric skin color data did not correlate with the degree of solar elastosis. Therefore, cutaneous color changes and solar elastosis are separate, age-related phenomena. Physicians should be aware of the possible histologic changes in actinically damaged facial skin, regardless of the skin color.
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Affiliation(s)
- Dai Hyun Kim
- Department of Anatomy, Korea University College of Medicine, Seoul, Korea
| | - Ga Na Oh
- Ogana Skin Clinic, Seoul, Republic of Korea
| | - In Hyuk Kwon
- Department of Dermatology, Korea University College of Medicine, Seoul, Korea
| | - Soo Hong Seo
- Department of Dermatology, Korea University College of Medicine, Seoul, Korea
| | - Young Chul Kye
- Department of Dermatology, Korea University College of Medicine, Seoul, Korea
| | - Hyo Hyun Ahn
- Department of Dermatology, Korea University College of Medicine, Seoul, Korea
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9
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Ma L, Tan Y, Zheng S, Li J, Jiang C, Chen Z, Wang X. Correlation study between image features and mechanical properties of Han Chinese facial skin. Int J Cosmet Sci 2016; 39:93-100. [PMID: 27490521 DOI: 10.1111/ics.12356] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 07/27/2016] [Indexed: 10/21/2022]
Affiliation(s)
- L. Ma
- Skin and Cosmetic Research Department Shanghai Skin Disease Hospital Shanghai 200443 China
| | - Y. Tan
- Skin and Cosmetic Research Department Shanghai Skin Disease Hospital Shanghai 200443 China
| | - S. Zheng
- Skin and Cosmetic Research Department Shanghai Skin Disease Hospital Shanghai 200443 China
| | - J. Li
- Skin and Cosmetic Research Department Shanghai Skin Disease Hospital Shanghai 200443 China
| | - C. Jiang
- Skin and Cosmetic Research Department Shanghai Skin Disease Hospital Shanghai 200443 China
| | - Z. Chen
- Skin and Cosmetic Research Department Shanghai Skin Disease Hospital Shanghai 200443 China
| | - X. Wang
- Skin and Cosmetic Research Department Shanghai Skin Disease Hospital Shanghai 200443 China
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10
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Kim DH, Rhyu YS, Ahn HH, Hwang E, Uhm CS. Skin microrelief profiles as a cutaneous aging index. Microscopy (Oxf) 2016; 65:407-414. [DOI: 10.1093/jmicro/dfw019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 05/18/2016] [Indexed: 11/14/2022] Open
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11
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Shih H. A precise automatic system for the hair assessment in hair-care diagnosis applications. Skin Res Technol 2015; 21:500-7. [DOI: 10.1111/srt.12220] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/14/2015] [Indexed: 11/30/2022]
Affiliation(s)
- H. Shih
- Human-Computer Interaction Multimedia Laboratory; Department of Electrical Engineering; Yuan Ze University; Taoyuan Taiwan
- The Innovation Center for Big Data and Digital Convergence; Yuan Ze University; Taoyuan Taiwan
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12
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Dynamic analysis of modified transcutaneous lower blepharoplasty based on biochemical and biophysical principles. Ann Plast Surg 2014; 71:634-8. [PMID: 23435414 DOI: 10.1097/sap.0b013e3182583f1a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In this study, we analyzed the key parameters of modified transcutaneous lower blepharoplasty based on multidisciplinary principles (biochemical findings and biophysical wrinkling theory). A total of 408 female patients received our subciliary lower blepharoplasty between March 2002 and January 2010. The severity of the eyebags (dynamic wrinkle numbers and prolapse) was evaluated through preoperative and postoperative photography, whereas the excised lower eyelid skin specimens from 56 patients were investigated with hematoxylin and eosin staining. The modified techniques produced significant improvements in the severity of eyebags in all age groups (P < 0.001). Poor surgical outcome was found to correlate significantly with preoperative dynamic wrinkle numbers (P < 0.001). Age, dynamic wrinkle numbers, and prolapse correlated significantly with dermal fiber density (P = 0.004, 0.000, and 0.000, respectively) but not epidermal, rete ridge, and dermal thickness or the number of rete ridges. In conclusion, modified transcutaneous lower blepharoplasty provides significant improvement to dynamic wrinkles and prolapse in the eyebags. Periorbital aging progressively disturbs the dermal compactness (fiber density) until the structure can no longer hold its integrity at the critical age (around the age of 40).
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13
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Trojahn C, Dobos G, Schario M, Ludriksone L, Blume-Peytavi U, Kottner J. Relation between skin micro-topography, roughness, and skin age. Skin Res Technol 2014; 21:69-75. [PMID: 24889351 DOI: 10.1111/srt.12158] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/08/2014] [Indexed: 11/28/2022]
Abstract
BACKGROUND The topography of the skin surface consists of lines, wrinkles, and scales. Primary and secondary lines form a network like structure that may be identified as polygons. Skin surface roughness measurements are widely applied in dermatological research and practice but the relation between roughness parameters and their anatomical equivalents are unclear. This study aimed to investigate whether the number of closed polygons (NCP) per measurement field can be used as a reliable parameter to measure skin surface topography. For this purpose, we analysed the relation between skin surface roughness parameters and NCP in different age groups. METHODS Images of the volar forearm skin of 38 subjects (14 children, 12 younger, and 12 older adults) were obtained with the VisioScan VC98. The NCP was counted by three independent researchers and selected roughness parameters were measured. Interrater reliability of counting the number of closed polygons and correlations between NCP, roughness parameters, and age were calculated. RESULTS The mean NCP/mm² in children was 3.1 (SD 1.1), in younger adults 1.0 (SD 0.7), and in older adults 1.0 (SD 0.9). The interrater reliability was 0.9. A negative correlation of NCP/mm² with age was observed, whereas measured roughness parameters were positively associated with age. NCP/mm² was weakly related to skin roughness. CONCLUSION The NCP/mm² is a reproducible parameter for characterizing the skin surface topography. It is proposed as an additional parameter in dermatological research and practice because it represents distinct aspects of the cutaneous profile not covered by established roughness parameters.
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Affiliation(s)
- C Trojahn
- Department of Dermatology and Allergy, Clinical Research Center for Hair and Skin Science, Charité-Universitätsmedizin Berlin, Berlin, Germany
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14
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Choi YH, Kim D, Hwang E, Kim BJ. Skin texture aging trend analysis using dermoscopy images. Skin Res Technol 2014; 20:486-97. [DOI: 10.1111/srt.12143] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/05/2014] [Indexed: 11/27/2022]
Affiliation(s)
- Y.-H. Choi
- School of Electrical Engineering; Korea University; Seoul Korea
| | - D. Kim
- School of Electrical Engineering; Korea University; Seoul Korea
| | - E. Hwang
- School of Electrical Engineering; Korea University; Seoul Korea
| | - B. J. Kim
- Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
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15
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Ryu JH, Seo YK, Boo YC, Chang MY, Kwak TJ, Koh JS. A quantitative evaluation method of skin texture affected by skin ageing using replica images of the cheek. Int J Cosmet Sci 2014; 36:247-52. [PMID: 24697841 DOI: 10.1111/ics.12120] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Accepted: 02/13/2014] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Skin texture is a fine structure of skin surface where the hill and furrow were crossed to form a star shape. This study was performed to establish a quantitative evaluation method of skin texture affected by skin ageing using replica images of the cheek. METHODS After producing replicas of the left cheek areas of 80 female subjects, representative replica images were chosen to establish six-level facial skin texture index. Using this new index, skin texture of different-aged subjects was visually assessed by multiple examiners. The number of star configurations was also analysed using the same replica images. Other factors contributing to skin texture, such as skin elasticity, roughness, dermal density, moisture and gloss, were also analysed. RESULTS The concordance between skin texture scores evaluated by three researchers was high (0.896), and there was a high correlation between skin texture score and age (r = 0.642). The number of star configurations showed high correlations with skin texture scores (r = 0.753) and with age (r = 0.776). Skin texture scores were highly correlated with skin roughness and dermal density, but not with moisture, gloss and elasticity. CONCLUSION This study suggests that visual grading of skin texture score based on new facial skin texture index and quantification of star configurations will be useful in evaluating skin ageing.
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Affiliation(s)
- J H Ryu
- Dermapro Ltd., Skin Research Center, 4F Jiho B/D, Bangbaejoongang-Ro 30, Seocho-Gu, Seoul, Korea
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16
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Kim YM, Ku B, Jung CJ, Kim JU, Jeon YJ, Kim KH, Kim JY. Constitution-specific features of perspiration and skin visco-elasticity in SCM. Altern Ther Health Med 2014; 14:24. [PMID: 24422750 PMCID: PMC3897972 DOI: 10.1186/1472-6882-14-24] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2013] [Accepted: 01/10/2014] [Indexed: 11/10/2022]
Abstract
BACKGROUND Human skin properties have been used as an important diagnostic component in traditional medicine as they change with health conditions. Sasang constitutional medicine (SCM) puts emphasis on the recognition of the constitution-specific skin features prior to the diagnostic decision of health. In this work, in search of skin-characteristics effectively reflecting SCM features, we compared several skin properties such as perspiration, visco-elasticity, elasticity, and elasticity hysteresis, in several candidate body parts. METHODS We conducted a clinical study in which a total of 111 healthy females aged 50 - 70 years participated with their Sasang constitution (SC) types determined objectively by the Sasang constitutional analytic tool. Perspiration on the skin surface was estimated by using a capacitance sensor to measure the amount of moisture on the palm, forehead, and philtrum before and after a heating stimulus. We acquired the visco-elasticity, elasticity, and elasticity hysteresis at the forearm by Dermalab's elasticity sensing device. An analysis of covariance (ANCOVA) was conducted to evaluate the effect of SC on the nine skin features acquired. RESULTS The visco-elasticity of the forearm of the Soeum-in (SE) group was significantly lower than that of the Taeeum-in (TE) group (F = 68.867, p < 0.001), whereas the elasticity hysteresis of the SE group was higher than that of the TE group (F = 10.364, p < 0.01). The TE group had more perspiration on the forehead than the SE group (F = 9.050, p < 0.01). The SE group had a large perspiration difference between the philtrum and the forehead compared with the TE group (F = 7.892, p < 0.01). CONCLUSIONS We found four significant skin features that reflect the inherent constitutional attributes of the TE and SE groups in accordance with SCM literature; the visco-elasticity, elasticity hysteresis, perspiration on the forehead and philtrum. Our findings are based on a novel interpretation of the SCM literature and will contribute to developing the constitutional health status evaluation system in SCM.
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17
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Oh GN, Yoon JH, Kye HS, Kim DH, Kim JY, Choi JE, Seo SH, Kye YC, Ahn HH, Rhyu IJ. 3D reconstruction of skin pathological tissue: the understanding of microrelief pattern and dermal ridge. Skin Res Technol 2013; 20:213-7. [PMID: 23981137 DOI: 10.1111/srt.12108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/18/2013] [Indexed: 11/28/2022]
Abstract
AIM Most studies about the structures of the human skin have been on the general histologic features of the skin. The purpose of this study was to understand the relationship between the microrelief (MR) pattern and histologic structure of the human skin, and to find the usefulness of the three-dimensional reconstruction (3DR) technique of pathological skin tissue. MATERIALS, SUBJECTS, AND METHODS Human skin specimens were obtained from the medial forearm, abdomen, and volar aspects of the finger tips of cadavers. Two-dimensional surface-viewed images of the skin showing MR patterns were obtained using dry dermoscopy. Histologic structures of the skin were evaluated by 3D images obtained using the 3DR technique. RESULTS MR was deeper and wider in the abdomen than in the medial side of the forearm. In the medial side of the forearm, 10.27 rete ridges were distributed in a plateau, on average. In the abdomen, about 14.37 rete ridges were distributed in a plateau. From 3DR technique, MR pattern thought to be a superordinate concept to rete ridges. CONCLUSION The 3DR technique was useful and may allow a better understanding of the pathogenetic changes in the skin surface in aging skin.
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Affiliation(s)
- Ga Na Oh
- Department of Dermatology, College of Medicine, Korea University, Seoul, Korea
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18
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Liao CK, Tsai FC, Fong TH, Hu CM, Wei PL, Su CH. Damage from periorbital ageing to the multilayered structures and resilience of the skin in Chinese population. Int J Exp Pathol 2013; 94:188-94. [PMID: 23441675 DOI: 10.1111/iep.12019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Accepted: 01/09/2013] [Indexed: 11/29/2022] Open
Abstract
Ageing dynamically disrupts the multilayered supporting components of the skin that are held together by cell adhesion molecules (CAMs). Skin specimens from 33 female Chinese patients undergoing lower blepharoplasty were divided into three age groups and examined by haematoxylin and eosin (H&E) staining, immunohistochemistry (IHC) and Elastica-van Gieson (EVG) stains, western blotting, surface electron microscopy (SEM) and biomechanical tension analysis. The SEM density (skin surface topology) showed a negative linear relationship with age. The triangular pattern of the skin surface in the younger group gradually broke down into quadrangular and irregular patterns in the older group. Collagens and elastic fibres in the dermis showed anisotropy and decreased density in the older groups compared with the younger group, especially in the papillary dermis. Anisotropy means that physical properties differ according to the direction of measurement. E-cadherin and integrin αv (whose functions are to bind epidermal and dermal elements respectively) increased and decreased, respectively, in the oldest group. Skin resilience decreased significantly in this group under repetitive stress. In conclusion, a loss of skin surface textures, integrin αv expressions, epidermal-dermal connections and dermal compactness led to the multilayered structure of the skin becoming separated. This in turn decreased resilience during ageing. These findings may therefore explain why aged skins cannot tolerate repetitive facial expressions, and why this action produces further dynamic wrinkles.
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Affiliation(s)
- Chuh-Kai Liao
- Graduate Institute of Medical Sciences, Department of Family Medicine, Taipei Municipal Wan Fang Hospital, College of Medicine, Taipei Medical University, Taipei, Taiwan.
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Gao Q, Yu J, Wang F, Ge T, Hu L, Liu Y. Automatic measurement of skin textures of the dorsal hand in evaluating skin aging. Skin Res Technol 2013; 19:145-51. [DOI: 10.1111/srt.12025] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/10/2012] [Indexed: 11/29/2022]
Affiliation(s)
- Qian Gao
- Department of Environmental Health; School of Public Health; China Medical University; Shenyang China
| | - Jiaming Yu
- The Fourth Affiliated Hospital of China Medical University; Shenyang China
| | - Fang Wang
- Department of Environmental Health; School of Public Health; China Medical University; Shenyang China
| | - Tiantian Ge
- Department of Environmental Health; School of Public Health; China Medical University; Shenyang China
| | - Liwen Hu
- Department of Environmental Health; School of Public Health; China Medical University; Shenyang China
| | - Yang Liu
- Department of Environmental Health; School of Public Health; China Medical University; Shenyang China
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Relationship between microstructure of the skin surface and surface reflection based on geometric optics. J Dermatol Sci 2012; 66:225-32. [DOI: 10.1016/j.jdermsci.2012.03.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2011] [Revised: 02/20/2012] [Accepted: 03/24/2012] [Indexed: 12/11/2022]
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Pena Ferreira MR, Costa PC, Bahia FM. Efficacy of anti-wrinkle products in skin surface appearance: a comparative study using non-invasive methods. Skin Res Technol 2010; 16:444-9. [DOI: 10.1111/j.1600-0846.2010.00458.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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