The Hybrid Assistive Limb Lumbar Type (HAL) is an active exoskeleton that provides motion according to the wearer's voluntary drive. It was developed to support back muscles during repetitive lifting tasks. The purpose of this paper was to determine if the myoelectric activity of the back muscles is reduced or altered when using the HAL and to investigate a possible influence of its use on the cardiovascular system. Fourteen healthy young men without lower back pain underwent a freestyle, symmetrical-lifting protocol. Participants lifted a 17.05 kg handled-box for 10 min. with and without HAL support. Surface electromyography (sEMG) signals were recorded at thoracic (TES) and lumbar erector spinae (LES) and quadriceps femoris (QF). Heart rate was recorded from electrocardiogram. The subjects rated their level of physical exertion using the Borg Rating of Perceived Exertion (BORG) scale. Additionally they commented on sites of discomfort, perceptions of force, and loss of range of motion. The root mean square and integrated sEMG value was significantly reduced at the LES and TES. Heart rate variability output variables did not show any significant difference. The BORG-Scale showed no difference, with a mean score of 2.5. The HAL decreased the magnitude and onset of muscle activity and force in the lower back in a repetitive lifting task. Reduction of the muscle force and activity required during the lifting process is meaningful regarding lower back pain prevention, and the HAL may contribute to reducing the incidence of lower back pain in the working population.

中文翻译：

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人体举重辅助工具（HAL®用于护理支持）在重复举重任务中减少下背部肌肉活动的功效。

混合辅助肢体腰椎型（HAL）是一种主动外骨骼，可根据穿戴者的自愿驾驶提供运动。它的开发旨在在重复提举任务中支撑背部肌肉。本文的目的是确定使用HAL时背部肌肉的肌电活动是否减少或改变，并研究其对心血管系统的可能影响。14名没有下背部疼痛的健康年轻人接受了自由式，对称举重运动。参与者举起了17.05公斤的搬运箱，历时10分钟。有无HAL支持。在胸（TES）和腰直肌（LES）和股四头肌（QF）记录表面肌电图（sEMG）信号。从心电图记录心率。受试者使用博格感知运动量（BORG）量表对他们的体力活动水平进行评估。此外，他们还对不适，力觉和运动范围丧失的部位进行了评论。LES和TES的均方根和sEMG积分值显着降低。心率变异性输出变量没有显示任何显着差异。BORG量表无差异，平均得分为2.5。HAL在重复的提举任务中降低了下背部肌肉活动和力量的大小和发作。降低举重过程中所需的肌肉力量和活动对于预防下背痛是有意义的，并且HAL可能有助于减少工作人群中下背痛的发生率。此外，他们还对不适，力觉和运动范围丧失的部位进行了评论。LES和TES的均方根和sEMG积分值显着降低。心率变异性输出变量没有显示任何显着差异。BORG量表无差异，平均得分为2.5。HAL在重复的提举任务中降低了下背部肌肉活动和力量的大小和发作。降低举重过程中所需的肌肉力量和活动对于预防下背痛是有意义的，并且HAL可能有助于减少工作人群中下背痛的发生率。此外，他们还对不适，力觉和运动范围丧失的部位进行了评论。LES和TES的均方根和sEMG积分值显着降低。心率变异性输出变量没有显示任何显着差异。BORG量表无差异，平均得分为2.5。HAL在重复的提举任务中降低了下背部肌肉活动和力量的大小和发作。降低举重过程中所需的肌肉力量和活动对于预防下背痛是有意义的，并且HAL可能有助于减少工作人群中下背痛的发生率。LES和TES的均方根和sEMG积分值显着降低。心率变异性输出变量没有显示任何显着差异。BORG量表无差异，平均得分为2.5。HAL在重复的提举任务中降低了下背部肌肉活动和力量的大小和发作。降低举重过程中所需的肌肉力量和活动对于预防下背痛是有意义的，并且HAL可能有助于减少工作人群中下背痛的发生率。LES和TES的均方根和sEMG积分值显着降低。心率变异性输出变量没有显示任何显着差异。BORG量表无差异，平均得分为2.5。HAL在重复的提举任务中降低了下背部肌肉活动和力量的大小和发作。降低举重过程中所需的肌肉力量和活动对于预防下背痛是有意义的，并且HAL可能有助于减少工作人群中下背痛的发生率。