期刊
ERGONOMICS
卷 55, 期 10, 页码 1166-1179出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00140139.2012.703695
关键词
physical workload; mental workload; physiological responses; performance
资金
- Occupational Safety and Health Research Center (OSHRC) at Virginia Tech
Many workers experience combined physical and mental demands in their jobs, yet the contribution of these demands to the development of musculoskeletal disorders is unclear. The purpose of this study was to investigate muscle- and task-dependent responses to concurrent demands during intermittent static work. Twenty-four participants performed shoulder, wrist, and torso exertions at three levels of physical workload (PWL) in the absence (control) and presence (concurrent) of a mental arithmetic task. Compared to the control, concurrent demand conditions resulted in decreased muscle activity (4-9% decrease), increased cardiovascular load (2-4% increase), and impaired motor co-ordination (9-24% increase in force fluctuation). Furthermore, these outcomes were more prominent at higher PWL levels and within postural (shoulder and torso) muscles. Mental task performance exhibited greater interference with the physical task at low and high PWL levels. Thus, it may be important to consider these muscle- and task-specific interactions of concurrent demands during job design to address worker health and performance issues.
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