López-Nicolás Manuel, García-Vidal José A, Medina-Mirapeix Francesc, Sánchez-Onteniente Joaquín P, Berná Mestre Juan D, Martín-San Agustín Rodrigo, Escolar-Reina María P
Department of Dermatology, Stomatology, Radiology and Physical Medicine, University of Murcia, Murcia, Spain.
Department of Physiotherapy, University of Murcia, Murcia, Spain.
PeerJ. 2019 Nov 7;7:e8028. doi: 10.7717/peerj.8028. eCollection 2019.
The aim of this study was to evaluate the effect of different ergonomic supports on the muscle activity of two trunk muscles while a group of dentists performed a common dental procedure on a phantom head, divided into three tasks.
A one-way repeated measures study (ANOVA) was conducted on a group of 36 dentists. The middle trapezius and lumbar erector spinae muscles were measured with and without the use of different ergonomic supports (ergonomic stool, magnification lenses and both) using a portable surface electromyography (sEMG) device. Intraclass correlation coefficients (ICCs) and the absolute standard error of measurement (SEM) were used to establish the reliability of the baseline measures without ergonomic supports.
The sEMG showed excellent ICCs (ranging from 0.92 to 0.99) and SEM. Bonferroni post hoc tests showed differences between the three ergonomic supports ( < 0.001) in both muscles studied. The lowest muscle activity measurement occurred with the isolated used of magnification lenses. The use of the ergonomic stool increased the muscle activity of the middle trapezius and lumbar erector spinae muscles to a greater extent than the magnification lenses. The combination of the ergonomic stool and the magnification lenses produced a different effect on each muscle.
本研究的目的是评估在一组牙医对模拟人头进行一项常见牙科操作（分为三项任务）时，不同人体工程学支撑对两块躯干肌肉肌肉活动的影响。
对一组36名牙医进行单向重复测量研究（方差分析）。使用便携式表面肌电图（sEMG）设备，在使用和不使用不同人体工程学支撑（人体工程学凳子、放大镜片以及两者皆用）的情况下，测量斜方肌中部和竖脊肌。组内相关系数（ICC）和测量的绝对标准误差（SEM）用于确定在没有人体工程学支撑时基线测量的可靠性。
表面肌电图显示出优异的组内相关系数（范围为0.92至0.99）和测量的绝对标准误差。Bonferroni事后检验显示，在所研究的两块肌肉中，三种人体工程学支撑之间存在差异（<0.001）。单独使用放大镜片时，肌肉活动测量值最低。与放大镜片相比，使用人体工程学凳子在更大程度上增加了斜方肌中部和竖脊肌的肌肉活动。人体工程学凳子和放大镜片的组合对每块肌肉产生了不同的影响。
