Ibrahim Alaa I, Abdelsalam Mohammed S, Muaidi Qassim I, Hawamdeh Ziad M
Department of Physical Therapy, College of Applied Medical Sciences, University of Dammam, Kingdom of Saudi Arabia .
Int J Rehabil Res. 2013 Jun;36(2):118-26. doi: 10.1097/MRR.0b013e32835a23ff.
The aim of this study was to examine bilateral isometric muscle strength (IMS) in right-handed boys. To determine the association between the magnitudes of right handedness (MRH) and (a) the interside difference indexes of IMS of certain muscle categories, (b) age, and (c) some anthropometric characteristics. This was a cross-sectional study. A convenience sample of 94 right-handed boys between 6 and 10 years of age was investigated. The Edinburgh Handedness Inventory was used to evaluate hand dominance and its magnitude. IMS of eight muscle groups was measured and the interside difference was determined. Five interside difference indexes were calculated for the upper limb, lower limb, hand grip, key pinch, and total side. All interside difference indexes of IMS were less than 5%, in favor of the dominant right side. The majority (86.1%) of our boys scored high to moderate MRH, whereas the minority (13.8%) scored low MRH. The hand grip interside difference index (β=0.40, P=0.000), the key pinch interside difference index (β=0.23, P=0.003), age (β=0.24, P=0.034), and height (β=0.33, P=0.039) are the best set of predictors of the dominance score and in turn the MRH. The results of this study, carried out on right-handed boys aged 6-10 years, indicated a standard difference in IMS between dominant and nondominant sides of all studied muscle strength categories. Furthermore, it was found that the hand grip interside difference index, the key pinch interside difference index, age, and height could influence the MRH.
本研究旨在检测右利手男孩的双侧等长肌力（IMS）。确定右利手程度（MRH）与（a）某些肌肉类别的IMS双侧差异指数、（b）年龄以及（c）一些人体测量特征之间的关联。这是一项横断面研究。对94名6至10岁的右利手男孩进行了便利抽样调查。使用爱丁堡利手量表评估利手及其程度。测量了八组肌肉的IMS并确定了双侧差异。计算了上肢、下肢、握力、捏力和总体侧的五个双侧差异指数。所有IMS的双侧差异指数均小于5%，优势侧为右侧。我们的大多数男孩（86.1%）右利手程度为高到中度，而少数（13.8%）右利手程度较低。握力双侧差异指数（β=0.40，P=0.000）、捏力双侧差异指数（β=0.23，P=0.003）、年龄（β=0.24，P=0.034）和身高（β=0.33，P=0.039）是优势得分进而MRH的最佳预测指标组合。这项针对6至10岁右利手男孩的研究结果表明，在所有研究的肌肉力量类别中，优势侧和非优势侧的IMS存在标准差异。此外，还发现握力双侧差异指数、捏力双侧差异指数、年龄和身高会影响MRH。
