Lin C J, Bernard T M, Ayoub M M
Department of Industrial Engineering, Chung Yuan Christian University, Chung Li, Taiwan.
Ergonomics. 1999 Aug;42(8):1051-9. doi: 10.1080/001401399185135.
A biomechanical evaluation of lifting speed was conducted in the laboratory. The study investigated the effects of lifting speed on several predetermined biomechanical cost functions. The lifting tasks consisted of five lifting speeds labelled as the slowest, slow, normal, fast and fastest, and three weights, 50, 65 and 80% of their maximum acceptable weight of lift. The speed at each level was determined individually by each subject according to their capability. The study found that work-related measures, including the total net muscle work, total absolute net muscle work and work done to the load, decreased significantly as the lifting speed increased (p < 0.05, < 0.001 and < 0.001, respectively). The time integral of sum of squared ratio of joint moment and strength also decreased significantly (p < 0.001). This indicates that lifting at a faster speed tends to reduce the work the body has to do. The peak speed of load occurred at 70% of total lifting time for the slowest lifts, but at 30% of total lifting time for other lifting speeds. Performing lifts at the minimum speeds changed the usual speed coordination technique the subjects used.
在实验室中对提升速度进行了生物力学评估。该研究调查了提升速度对几个预先确定的生物力学成本函数的影响。提升任务包括五种提升速度，分别标记为最慢、慢、正常、快和最快，以及三种重量，即其最大可接受提升重量的50%、65%和80%。每个受试者根据自身能力分别确定每个水平的速度。研究发现，与工作相关的指标，包括总净肌肉功、总绝对净肌肉功和对负荷所做的功，随着提升速度的增加而显著降低（分别为p < 0.05、< 0.001和< 0.001）。关节力矩与力量平方比之和的时间积分也显著降低（p < 0.001）。这表明以更快的速度提升往往会减少身体必须做的功。对于最慢的提升，负荷的峰值速度出现在总提升时间的70%处，但对于其他提升速度，出现在总提升时间的30%处。以最低速度进行提升改变了受试者通常使用的速度协调技术。
