Manual handling tasks create external spine moments that must be resisted and controlled through coordinated muscle recruitments. With asymmetric lifting there is an increase in the external lateral bending and twisting moments acting on the spine. These moments are indicators of asymmetric muscle recruitments that result in localized loading of specific muscles and connective tissues within the spine (Lavender et al., 1992). Hence, occupational tasks that require asymmetric lifting have been associated with the development of work-related low back pain (Andersson, 1991, Waters et al., 1993). While some would argue that the exposure to lateral bending and twisting moments could be controlled through training on lifting techniques, the literature suggest that training has limited effectiveness in preventing low back pain (Daltroy et al., 1997; Lavender et al., 2007; van Poppel et al., 1999), even with training that specifically focused on minimizing the these moments (Lavender et al., 2002; Lorenz et al., 2002).
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机译：手动处理任务会通过协调的肌肉招募产生必须抵抗和控制的外部脊椎矩。在不对称上升的情况下，存在在脊柱上的外侧横向弯曲和扭转时刻增加。这些时刻是不对称肌肉募集的指标，导致脊柱内的特定肌肉和结缔组织的局部装载（Lavender等，1992）。因此，需要不对称提升的职业任务与工作有关的低腰疼的发展有关（Andersson，1991，Waters等，1993）。虽然有些人会争辩说，通过训练升降技术可以控制横向弯曲和扭曲时刻，但文献表明，培训在防止腰痛有限（Daltroy等，1997; Lavender等，2007; van Poppel等，1999），即使有专门专注于最小化这些时刻的培训（Lavender等，2002; Lorenz等，2002）。
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