Musculoskeletal disorders (MSDs) are common among manufacturing workers. Exposure to non-neutral postures and high movement speeds associated with MSDs among manufacturing workers may depend on the extent of the variability in the work tasks performed (i.e., predominantly “cyclic” versus “non-cyclic” work). The objectives of this study were to (i) compare mean levels of full-shift exposure summary metrics based on both posture and movement speed between manufacturing workers performing predominantly cyclic (n = 18) and non-cyclic (n = 17) tasks, and (ii) explore patterns of between- and within-worker exposure variance and between-minute (within-shift) exposure level and variation within each group. Inertial sensors were used to measure exposures for up to 15 full shifts per participant. Results indicated (i) substantially higher upper arm and trunk movement speeds among workers performing predominantly cyclic tasks relative to workers performing non-cyclic tasks despite similar postures, and (ii) greater exposure variability both between and within workers in the non-cyclic group.

肌肉骨骼疾病 (MSD) 在制造业工人中很常见。制造业工人暴露于与 MSD 相关的非中性姿势和高移动速度可能取决于所执行工作任务的可变性程度（即主要是“循环”工作与“非循环”工作）。本研究的目的是 (i) 比较基于姿势和移动速度的全班次暴露汇总指标的平均水平，制造工人主要执行循环 (n = 18) 和非循环 (n = 17) 任务，以及(ii) 探索工人之间和内部的暴露差异模式以及每分钟之间（轮班内）暴露水平和每组内的变化。惯性传感器用于测量每位参与者最多 15 个全班次的暴露情况。