Department of Orthodontics, Matsumoto Dental University, Shiojiri, Nagano, Japan.
J Oral Rehabil. 2012 Jun;39(6):399-404. doi: 10.1111/j.1365-2842.2011.02268.x. Epub 2011 Nov 24.
The objectives of this study were to quantitatively evaluate the gender differences in the lip-closing force (LCF) generated during pursing-like lip-closing movement using a multidirectional LCF measurement system in healthy young adults. In 40 healthy subjects (20 women, 20 men; median age = 26·5 years, range = 22-41 years), LCF was recorded in eight directions during the performance of a voluntary pursing-like lip-closing task in four measurement sessions. The correlations between the total sum of the forces generated in all eight directions [total LCF (TLCF)] and each directional LCF (DLCF) and those between opposing DLCF were statistically analysed. The TLCF obtained from the highly reproducible measurements acquired in the four different sessions was normally distributed in both genders. The TLCF in men was significantly greater than that in women. Among the eight pairs of opposing DLCF, seven pairs of opposing DLCF showed significant correlations in men, while five pairs were significantly correlated in women. In men, no significant difference was observed between opposing DLCF; however, three pairs of opposing DLCF were significantly different in women. The present results quantitatively indicate that there are gender differences in the magnitude and directional specificity of the LCF produced during pursing-like lip-closing movement in healthy young adults.
本研究旨在使用多向唇闭合力（LCF）测量系统定量评估健康年轻成年人在进行类吮吸唇闭合运动时产生的LCF 的性别差异。在 40 名健康受试者（20 名女性，20 名男性；中位年龄=26.5 岁，范围 22-41 岁）中，在四个测量阶段中，在进行自愿类吮吸唇闭合任务时，在八个方向上记录 LCF。对在所有八个方向上产生的总力之和[总 LCF（TLCF）]与每个方向 LCF（DLCF）之间以及相反 DLCF 之间的相关性进行了统计学分析。在四个不同阶段获得的高度可重复测量中获得的 TLCF 在两性中均呈正态分布。男性的 TLCF 明显大于女性。在 8 对相反的 DLCF 中，男性中有 7 对相反的 DLCF 呈显著相关性，而女性中有 5 对呈显著相关性。在男性中，相反的 DLCF 之间没有观察到显著差异；然而，在女性中，有三对相反的 DLCF 有显著差异。本研究结果定量表明，在健康年轻成年人进行类吮吸唇闭合运动时，LCF 的大小和方向特异性存在性别差异。
