Revised Force-Endurance Models for the US Workforce

项目摘要 肥胖是工伤的一个危险因素，其日益增长的流行率可能与 未来伤害发生率和成本的增加。尽管对健康的影响 肥胖症已经得到越来越多的关注，但我们所知的仍有很大的局限性 关于肥胖水平对工作能力和受伤风险的影响。该项目将评估 与肥胖有关的耐力和疲劳的差异，这将为 了解超重和肥胖对职业表现的影响 活动和随后的受伤风险，特别是对于那些需要静态姿势的任务 这可能会受到疲劳发展的限制。此外，这项工作的目标是提供 人体工程学从业者，具有可应用于工作的修订力-耐力模型 设计和评估。具体目标1将解决肥胖的主要和相互作用的影响 持续等长握手、肩外展和躯干伸展的水平和工作量 任务。耐力将在四个相对负荷水平上进行评估，以提供结果 与职业相关的一系列任务需求。为了实现这一目标，非 年龄在25-54岁之间的肥胖、超重或肥胖将被招募并被要求 来参加四个实验课程。在每个课程中，参与者将完成一项 每个肌肉组在一个负荷水平上的耐力任务，而耐力时间和疲劳- 相关的反应被量化。使用从特定目标1收集的数据，修订后的部队- 耐力模型将在特定的目标2中开发。假设较高水平的 肥胖将与耐力能力受损有关。还预计现有的 模型不能预测超重和肥胖个体的耐力时间，限制了他们的 在人体工程学实践中的实用性，并要求修订的模型要保护肌肉 不断变化的劳动力的能力。这项研究的结果将有助于理解 肥胖对肌肉疲劳发展的影响，这对辨别能力很重要 个人风险因素，如肥胖和工作场所受伤风险之间的联系。 应用经修订的模型可促进改进工作场所设计和工作评估，以 容纳超重或肥胖工人的能力。与 国家职业研究议程目标，拟开展的长期工作目标是 确定职业性暴露对预防肌肉骨骼的影响 疾病和工人健康的改善。

Project Summary Obesity is a risk factor for workplace injury, and its growing prevalence may be associated with increases in the future incidence and cost of injuries. Although the health consequences of obesity have gained increasing attention, there are still major limitations in what is known regarding the effects of obesity level on work capacity and injury risk. This project will assess obesity-related differences in endurance and fatigue, which will provide useful information for understanding the impact of overweight and obesity on the performance of occupational activities and the subsequent risk of injury, particularly for those tasks requiring static postures that can be limited by fatigue development. In addition, the objective of this work is to provide ergonomics practitioners with revised force-endurance models that can be applied for work design and evaluation. Specific Aim 1 will address the main and interactive effects of obesity level and workload for sustained isometric hand grip, shoulder abduction, and torso extension tasks. Endurance will be evaluated at four levels of relative loading to provide results for an occupationally-relevant range of task demands. To achieve this aim, individuals who are non- obese, overweight, or obese and aged between 25-54 years will be recruited and asked to come in for four experimental sessions. During each session, participants will complete an endurance task for each muscle group at one workload level while endurance time and fatigue- related responses are quantified. With the data collected from Specific Aim 1, revised force- endurance models will be developed in Specific Aim 2. It is hypothesized that higher levels of obesity will be associated with impaired endurance capacity. It is also expected that the existing models are not predictive of endurance time for overweight and obese individuals, limiting their utility in ergonomics practice and requiring revised models to be protective of the muscle capacity of the changing workforce. Results from this research will contribute to understanding the impacts of obesity on the development of muscle fatigue, which is important for discerning the link between personal risk factors, such as obesity, and the risk of workplace injury. Application of the revised models can facilitate improved workplace design and job evaluation to accommodate the capacities of workers who are overweight or obese. Consistent with the National Occupational Research Agenda objectives, the long-term goal of the proposed work is to determine the impact of occupational exposures for the prevention of musculoskeletal disorders and the improvement of worker health.