Orantes-Gonzalez Eva, Heredia-Jimenez Jose
Department of Physical Education and Sport, University of Granada, Granada, Spain.
Department of Physical Education and Sport, University of Granada, Granada, Spain.
Gait Posture. 2017 Mar;53:61-66. doi: 10.1016/j.gaitpost.2017.01.012. Epub 2017 Jan 15.
This study analyzed the kinematic gait parameters associated with pulling a school trolley with different loads and the effects of the type of packing device user (backpack vs. trolley) and body side (loadedunloaded). Methods Fifty-three elementary subjects walked at a selfselected speed under four experimental conditions: without a trolley and pulling a trolley with 10%, 15% and 20% of the subject́s body weight (BW). Averages and standard deviations of spatiotemporal gait parameters and 3D kinematics of the lower limbs and thorax were obtained for the loaded and unloaded sides of the body. Results Spatiotemporal gait parameters were affected by pulling a trolley with a load of 20% BW, although the changes were not important (decrease of 0.02 units in velocity and stride length, decrease of 0.32% in single support and increase of 0.31% in double support). In the 3D kinematics analysis, the main effects of trolley load were observed in the thorax, with increased flexion as the load increased, and in the pelvis between baseline and 10%-15% BW. No interaction was found between kinematic parameters and the type of packing device user (trolley or backpack). Considering the loaded and unloaded sides of the body, the transverse plane of the thorax was the main site affected by the asymmetrical task. Conclusion Although some of the analyzed kinematic parameters were influenced by the use of a school trolley, the adaptations were minimal, and trolleys could be considered a good option for use in the transportation of school supplies.
本研究分析了与拉动不同负载的学校手推车相关的运动步态参数，以及包装设备使用者类型（背包与手推车）和身体侧别（负重/未负重）的影响。方法 53 名小学生在四种实验条件下以自选速度行走：不使用手推车以及拉动相当于受试者体重（BW）10%、15%和 20%的手推车。获取了身体负重侧和未负重侧的时空步态参数以及下肢和胸部三维运动学的平均值和标准差。结果 时空步态参数受到拉动相当于体重 20%负载的手推车的影响，尽管变化并不显著（速度和步长减少 0.02 单位，单支撑减少 0.32%，双支撑增加 0.31%）。在三维运动学分析中，手推车负载的主要影响在胸部观察到，随着负载增加屈曲增加，在基线与 10%-15%体重之间的骨盆也有影响。在运动学参数与包装设备使用者类型（手推车或背包）之间未发现相互作用。考虑身体的负重侧和未负重侧，胸部的横断面是受不对称任务影响的主要部位。结论 尽管一些分析的运动学参数受到使用学校手推车的影响，但适应性最小，并且手推车可被视为用于运输学习用品的一个不错选择。
