“…Commonly cited precursors of physical fatigue include (a) heavy workloads, (b) awkward working postures, (c) prolonged working hours, (d) unstructured physical environment, and/or (e) dynamic work conditions (Lu et al, 2017; Yung, 2016). Physical fatigue has been observed in several U.S. industries: (a) advanced manufacturing, where 57% of manufacturing workers reported that they were fatigued over the past work week (Lu et al, 2017); (b) construction, where 49% of surveyed construction workers reported being “tired some days” and 10% “tired most days or every day” (Zhang, Murphy, Fang, & Caban-Martinez, 2015); and (c) fulfillment center order pickers, who pick 200 to 250 items per hour, walk approximately 6 miles per day, and have a 75% higher reported rate of musculoskeletal disorders (MSD) than the average employee (Schneider, Copsey, & Irastorza, 2010); this is a booming area of employment that is associated with e-commerce. It is important to note that the high prevalence of workplace fatigue is not limited to the United States alone; it has also been reported in Canada, the European Union, and Japan (Kajimoto, 2008; Loriol, 2017; Yung, 2016).…”