Department of Movement and Training Science, University of Wuppertal, Wuppertal, Germany
Department of Movement and Training Science, University of Wuppertal, Wuppertal, Germany.
Occup Environ Med. 2024 Oct 8;81(9):456-461. doi: 10.1136/oemed-2024-109563.
This study investigates the impact of different work paces on cardiorespiratory outcomes, perceived effort and carried load (CL) in industrial workers.
A randomised cross-over trial was conducted at a mid-sized steel company. We included 12 healthy industrial workers (8 females, age: mean 44±SD 9 years, height: 1.70±0.08 m, body mass: 79.5±13.4 kg) with at least 6 months of working experience. All participants performed 5 min of piece work at 100% (P100), 115% (P115) and 130% (P130) of the company's internal target yielded in a randomised order, separated by 5 min familiarisation breaks. The primary outcome was energy expenditure (EE), calculated from a respiratory gas exchange using a metabolic analyser. Secondary outcomes were total ventilation, oxygen uptake, carbon dioxide release, respiratory exchange ratio, heart rate and rating of perceived effort (0-10). Furthermore, the metabolic equivalent and the CL were calculated. Data were analysed with repeated measure analyses of variance.
For EE, a large 'pace' effect with a small difference between P100 and P130 (165.9±33.4 vs 178.8±40.1 kcal/hour, p=0.008, standard mean difference, SMD=0.35) was revealed. Additionally, a large difference in CL between all paces (p<0.001, SMD≥1.10) was revealed. No adverse events occurred.
Cardiorespiratory outcomes rise with increased work pace, but the practical relevance of these differences still needs to be specified. However, the CL will add up over time and may impact musculoskeletal health in the long term.
本研究旨在探讨不同工作节奏对工业工人心肺功能结果、感知用力和携带负荷（CL）的影响。
在一家中型钢铁公司进行了一项随机交叉试验。我们纳入了 12 名健康的工业工人（8 名女性，年龄：平均 44±9 岁，身高：1.70±0.08m，体重：79.5±13.4kg），他们至少有 6 个月的工作经验。所有参与者以随机顺序分别进行 5 分钟的 100%（P100）、115%（P115）和 130%（P130）的公司内部目标的计件工作，中间间隔 5 分钟的熟悉期。主要结局指标是能量消耗（EE），通过代谢分析仪从呼吸气体交换中计算得出。次要结局指标是总通气量、氧气摄取量、二氧化碳释放量、呼吸交换率、心率和感知用力等级（0-10）。此外，还计算了代谢当量和 CL。数据采用重复测量方差分析进行分析。
对于 EE，发现了一个大的“节奏”效应，P100 和 P130 之间的差异很小（165.9±33.4 与 178.8±40.1 千卡/小时，p=0.008，标准均数差，SMD=0.35）。此外，所有节奏之间的 CL 差异很大（p<0.001，SMD≥1.10）。未发生不良事件。
心肺功能结果随着工作节奏的增加而上升，但这些差异的实际意义仍需进一步明确。然而，CL 会随着时间的推移而增加，并可能对肌肉骨骼健康产生长期影响。
