Department of Physiotherapy, Karol Marcinkowski Poznan University of Medical Sciences, 61-545 Poznan, Poland.
Department of Biomechanics, Poznan University of Physical Education, 61-871 Poznan, Poland.
Int J Environ Res Public Health. 2022 Mar 24;19(7):3843. doi: 10.3390/ijerph19073843.
This article investigates schoolchildren's ability to carry an additional load using a backpack (BP). According to scientific research, there is no precise limit to the maximum backpack load, which varies from 10% to 15% of body weight (BW). The purpose of this study was, therefore, to evaluate the influence of an additional external load carried using a backpack on gait kinematics among seven-year-old children in Poland, including assessment of the gender differences. The study was conducted among 26 (13 boys and 13 girls) primary school children aged seven years. The children walked at their preferred speed, under four conditions: with no load (0% BW) and with 10%, 15% and 20% BW. Spatiotemporal parameters were measured using the 2 m Footscan platform system and photocell Sectro timing system. The children walked more slowly under an additional load. Their step length and single support time decreased. Their base of support, step time and double support time increased. There was no significant effect on their stride length or gait cycle time. The gait kinematic changes were most evident between 10% BW and greater loading. The results highlight how children's gait is affected by carrying additional external loads, which should not exceed 10% BW. That limit is appropriate for both genders.
本文研究了学童使用背包（BP）携带额外负荷的能力。根据科学研究，背包的最大负荷没有精确的限制，其范围在体重的 10%到 15%之间。因此，本研究的目的是评估波兰 7 岁儿童使用背包携带额外外部负荷对步态运动学的影响，包括评估性别差异。研究对象为 26 名（13 名男孩和 13 名女孩）年龄为 7 岁的小学生。孩子们以自己喜欢的速度行走，分为四种情况：无负荷（0% BW）和 10%、15%和 20% BW。时空参数使用 2 米 Footscan 平台系统和光电 Sectro 定时系统进行测量。孩子们在额外的负荷下走得更慢。他们的步长和单支撑时间减少。他们的支撑基础、步长和双支撑时间增加。步长或步态周期时间没有明显变化。步态运动学的变化在 10% BW 及以上的负荷下最为明显。结果表明，携带额外外部负荷会如何影响儿童的步态，其负荷不应超过 10% BW。该限值适用于两性。
