Faculty of Health Sciences, Ontario Tech University, Oshawa, Canada.
Ergonomics. 2021 Mar;64(3):342-353. doi: 10.1080/00140139.2020.1832261. Epub 2020 Oct 15.
Working at a standing desk is a popular strategy to help reduce low back pain development during prolonged computer work. The purpose of this study was to examine how muscle activity, joint kinematics, weight distribution, balance and low back discomfort were affected by utilising footrests at different heights while working at a standing desk. Sixteen individuals performed a computer task at a standing workstation under four conditions: flat ground stance, and standing with one leg elevated on a low (10 cm), medium (20 cm), or high (30 cm) footrest. Footrest usage altered lumbo-pelvic and bilateral hip joint angles, muscle activity, weight distribution, and range of sway in the elevated limb. Additionally, footrest height altered lumbo-pelvic and hip joint position in the elevated limb. Discomfort increased with time across all conditions. Results suggest that intermittent utilisation of a footrest should be considered to promote changes in posture and muscle activity during prolonged computer use. This laboratory study showed that utilising a footrest between the heights of 10-30 cm during standing computer work may be beneficial to promote changes in posture and muscle activity over time. However, we recommend exercising caution while maintaining any standing position beyond 10 min of consecutive use. LBP: low back pain; PD: pain developer; NPD: non-pain developer; GMe: gluteus medius; TFL: tensor fascia lata; LES: lumbar erector spinae; COP: centre of pressure; NDI: northern digital incorporated; CV: coefficient of variation; WHQ: waterloo handedness questionnaire; WFQ: waterloo footedness questionnaire; VAS: visual analogue scale; OBDI: Oswestry back disability index; IBS: International Society of Biomechanics; sEMG: surface electromyography; MVIC: maximum voluntary isometric contraction; RMS: root mean square; A/P: anterior/posterior; M/L: medial/lateral; % MVE: percentage of maximum voluntary excitation; ROM: range of motion; MCID: minimum clinically important difference.
在长时间使用电脑时，站着工作是一种很受欢迎的策略，可以帮助减少下背部疼痛的发展。本研究的目的是研究在站立式办公桌工作时使用不同高度的脚凳时，肌肉活动、关节运动学、体重分布、平衡和下背部不适是如何受到影响的。16 名个体在四种条件下在站立式工作站上执行计算机任务：平地站立，以及用一只脚抬高在低（10cm）、中（20cm）或高（30cm）脚凳上站立。使用脚凳改变了腰椎骨盆和双侧髋关节角度、肌肉活动、体重分布和抬高肢体的摆动范围。此外，脚凳高度改变了抬高肢体的腰椎骨盆和髋关节位置。在所有条件下，不适感随着时间的推移而增加。结果表明，在长时间使用电脑时，应考虑间歇性使用脚凳来促进姿势和肌肉活动的改变。本实验室研究表明，在站立式计算机工作期间，在 10-30cm 之间使用脚凳可能有助于随着时间的推移促进姿势和肌肉活动的改变。然而，我们建议在连续使用超过 10 分钟时，对保持任何站立姿势保持谨慎。LBP：下背部疼痛；PD：疼痛发展者；NPD：非疼痛发展者；GMe：臀中肌；TFL：阔筋膜张肌；LES：腰方肌；COP：中心压力；NDI：北方数字公司；CV：变异系数；WHQ：滑铁卢手性问卷；WFQ：滑铁卢足性问卷；VAS：视觉模拟评分；OBDI：奥斯瓦尔德背部残疾指数；IBS：国际生物力学学会；sEMG：表面肌电图；MVIC：最大随意等长收缩；RMS：均方根；A/P：前后；M/L：内外；%MVE：最大随意兴奋的百分比；ROM：运动范围；MCID：最小临床重要差异。
