Ibrahim Alaa I, Muaidi Qassim I, Abdelsalam Mohammed S, Hawamdeh Ziad M, Alhusaini Adel A
Assistant Professor, Department of Physical Therapy, College of Applied Medical Sciences, University of Dammam, Dammam, KSA.
J Manipulative Physiol Ther. 2013 Nov-Dec;36(9):633-43. doi: 10.1016/j.jmpt.2013.08.009. Epub 2013 Oct 18.
The purpose of this study was to evaluate the isometric muscle strength (IMS) and dynamic balance in early- and middle-school-age boys and to assess the strength of association between the dynamic balance scores and 6 different IMS indexes.
This is a cross-sectional study of a convenience sample of 94 boys who were 6 to 10 years of age and classified into an early school age (6-8 years) group (n = 50) and a middle school age (8-10 years) group (n = 44). Balance was tested using a Biodex Balance System. Anteroposterior Stability Index, Mediolateral Stability Index, and Overall Stability Index were recorded. IMS of 11 muscle groups was measured with a handheld dynamometer and categorized into 6 different muscle strength indices.
The mean (SD) values of anteroposterior, mediolateral, and overall stability indexes observed for all study boys were 1.9 ± 1.0, 1.2 ± 0.7, and 2.5 ± 1.2 respectively. In the middle school age group, strong positive relationships were detected between the overall stability index and trunk, lower limb, anti-gravity, pro-gravity, and total strength indexes (r = -0.86/P < .001, r = -0.91/P < .001, r = -0.88/P < .001, r = -0.83/P < .001, and r = -0.84/P < .001 respectively), while no significant relationship was detected with the upper limb strength index (r = 0.159/P = .303). In the early school age group, moderate positive relationships were detected between the overall stability index and anti-gravity, lower limb, and total strength indexes (r = -0.404/P = .004, r = -0.356/P = .011, and r = -0.350/P = .013 respectively).
Dynamic balance did not appear to be mature by the age of 10 years. Better balance skills were recorded in the mediolateral direction than in the anteroposterior direction. In the middle school age group, the overall stability index had positive relationships with almost all examined muscle strength indexes excepting the upper limb strength index.
本研究旨在评估小学中低年级男生的等长肌力（IMS）和动态平衡能力，并评估动态平衡得分与6种不同IMS指标之间的关联强度。
这是一项横断面研究，对94名6至10岁的男生进行便利抽样，分为小学低年级组（6 - 8岁，n = 50）和小学中年级组（8 - 10岁，n = 44）。使用Biodex平衡系统测试平衡能力。记录前后稳定性指数、内外侧稳定性指数和总体稳定性指数。用手持测力计测量11个肌肉群的IMS，并将其分为6种不同的肌肉力量指数。
所有研究男生的前后、内外侧和总体稳定性指数的平均值（标准差）分别为1.9±1.0、1.2±0.7和2.5±1.2。在小学中年级组中，总体稳定性指数与躯干、下肢、抗重力、重力支持和总力量指数之间存在强正相关（r分别为 - 0.86/P <.001、r = - 0.91/P <.001、r = - 0.88/P <.001、r = - 0.83/P <.001和r = - 0.84/P <.001），而与上肢力量指数无显著相关性（r = 0.159/P =.303）。在小学低年级组中，总体稳定性指数与抗重力、下肢和总力量指数之间存在中度正相关（r分别为 - 0.404/P =.004、r = - 0.356/P =.011和r = - 0.350/P =.013）。
到10岁时，动态平衡能力似乎尚未成熟。内外侧方向的平衡技能记录优于前后方向。在小学中年级组中，总体稳定性指数与几乎所有检测的肌肉力量指数（除上肢力量指数外）呈正相关。
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