Salehi Mina, Choi Seobin, Kia Kiana, Chan Allen, Kincl Laurel, Kim Jeong Ho
School of Nutrition and Public Health, College of Health, Oregon State University, Corvallis, OR, USA.
Department of Environmental and Occupational Health, School of Public Health, Texas A&M University, College Station, TX, USA; Department of Industrial and Management Engineering, Incheon National University, Incheon, South Korea.
Appl Ergon. 2025 Oct;128:104537. doi: 10.1016/j.apergo.2025.104537. Epub 2025 Apr 21.
West Coast Dungeness crab fishers suffer a high prevalence of musculoskeletal injuries, especially low back pain. Substantial trunk flexion and associated low back loads during crab sorting tasks have been attributed to awkward sorting table heights. This study examined how varying table heights affect biomechanical loads on the low back and shoulders. Twenty-five participants performed crab sorting tasks at three table heights while trunk and shoulder joint angles, moments, muscle activity, perceived exertion, and discomfort were measured. Increasing table height reduced trunk flexion and lumbosacral (L5/S1) joint moments but increased shoulder flexion moments and upper trapezius muscle activity. Table height did not affect perceived exertion or discomfort. These findings indicate that increasing sorting table height can reduce biomechanical load on the low back but results in increased shoulder strain. This trade-off underscores the importance of adopting ergonomic designs balancing low back and shoulder biomechanics to determine appropriate sorting table height.
美国西海岸的珍宝蟹渔民肌肉骨骼损伤的患病率很高，尤其是下背痛。在螃蟹分拣任务中，躯干大量弯曲以及相关的下背负荷被认为是分拣台高度不合适所致。本研究考察了不同的台面高度如何影响下背部和肩部的生物力学负荷。25名参与者在三个台面高度上进行螃蟹分拣任务，同时测量躯干和肩关节角度、力矩、肌肉活动、主观用力程度和不适感。增加台面高度可减少躯干弯曲和腰骶（L5/S1）关节力矩，但会增加肩部弯曲力矩和斜方肌上部肌肉活动。台面高度不影响主观用力程度或不适感。这些发现表明，增加分拣台高度可降低下背部的生物力学负荷，但会导致肩部劳损增加。这种权衡凸显了采用平衡下背部和肩部生物力学的人体工程学设计来确定合适分拣台高度的重要性。
