Kavitha S, Natarajan Karthika, Thilagavathi G, Srinivas C R
Department of Dermatology, PSG Institute of Medical Sciences and Research, Coimbatore, Tamil Nadu, India.
Department of Textile and Fashion Technology, PSG College of Technology, Coimbatore, Tamil Nadu, India.
Int J Trichology. 2016 Oct-Dec;8(4):155-159. doi: 10.4103/0974-7753.203170.
Hair strength depends on various factors such as nutrition, environmental factors, sunlight, oiling, aging, conditioner, etc.
To compare the tensile strength and breaking point of the hair shaft between (1) vegetarian and nonvegetarian. (2) Those who regularly apply and those who do not apply oil. (3) Pigmented and nonpigmented hair, (4) childhood and elderly.
Hair fibers were mounted in tensile strength testing machine Zwick/Roell Z010 and gradual force was administered. The elongation of hair fiber in mm and the maximum force required to break the hair strand were recorded for each fiber.
Elasticity of the children's hair was more than the elasticity of adult ( = 0.05) although tensile strength in children hair was not statistically significant (>0.05). Similarly, the tensile strength was more among those who regularly consumed nonvegetarian food but the difference was not statistically significant ( > 0.05). There was no statistically significant difference in other groups ( > 0.05).
Elasticity in children hair is statistically more than elderly hair although there is no significant change in tensile strength.
头发强度取决于多种因素，如营养、环境因素、阳光、涂油、衰老、护发素等。
比较（1）素食者和非素食者之间、（2）经常涂油者和不涂油者之间、（3）有色素头发和无色素头发之间、（4）儿童和老年人之间毛干的抗张强度和断裂点。
将毛发纤维安装在Zwick/Roell Z010抗张强度试验机上，并施加逐渐增加的力。记录每根纤维以毫米为单位的伸长量以及拉断发丝所需的最大力。
儿童头发的弹性大于成年人头发的弹性（P = 0.05），尽管儿童头发的抗张强度无统计学意义（P>0.05）。同样，经常食用非素食食物者的抗张强度更高，但差异无统计学意义（P>0.05）。其他组之间无统计学显著差异（P>0.05）。
尽管抗张强度无显著变化，但儿童头发的弹性在统计学上高于老年人头发。
