Micromovements and discomfort associated with flight mission with helmet operation tasks with different levels of cognitive workload |
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| Affiliation: | 1. Department of Environmental and Public Health Sciences, University of Cincinnati College of Medicine, Cincinnati, OH, USA;2. Naval Medical Research Unit – Dayton, Wright-Patterson Air Force Base, Ohio, USA;3. Oak Ridge Institute for Science and Education, Oak Ridge, TN, USA;4. Air Force Research Laboratory, 711th Human Performance Wing, Wright-Patterson Air Force Base, Ohio, USA;1. School of Mechanical Engineering, Southeast University, Nanjing, 211189, China;2. School of Art, Southeast University, Nanjing, 211189, China;1. Department of Psychology, Hebei Normal University, Shijiazhuang, 050024, China;2. Department of Psychology, Hebei Medical University, Shijiazhuang, 050017, China;3. Department of Psychiatry, Beijing Children''s Hospital, Capital Medical University, National Center for Children''s Health, Beijing, 100101, China;4. Department of Medical Psychology, Air Force Medical University, Xi''an, 710032, China;1. School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi''an, 710129, China;2. Xi''an Modern Chemistry Research Institute, Xi''an, 710129, China;3. Aviation Key Laboratory of Science and Technology on Life-Support Technology, AVIC Aerospace Lifesaving Equipment Co., Ltd., Xiangyang, 441000, China;1. Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand;2. Department of Orthopaedic Surgery and Musculoskeletal Medicine University of Otago, Dunedin, New Zealand |
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| Abstract: | When performing stationary tasks under elevated cognitive workload, individuals must perform continual muscle contractions to maintain stability of the body, resulting in fatigue of the postural muscles. When the muscles perform these contractions in a prolonged manner, the body potentially responds through small changes in body movements—micromovements that may lead to discomfort. The study purpose was to evaluate impact of cognitive load on micromovements. The micromovements were measured during three different cognitive workloads; low, medium, and high. The NASA-TLX score was used to evaluate the perceived mental workload and discomfort was assessed by visual analog scale. In total, 60 subjects (30 males and 30 females) were recruited and performed cognitive tasks that simulated flight operations such as changing the radio frequency based on air traffic control messages, balancing the fuel levels in simulated fuel tanks, and aiming a reticle in a designated moving target using the cyclic control. Cognitive load was defined by the frequency of events. Micromovements were defined by changes in the center of pressure (COP) of the seat pan and COP standard deviation. It was found that the high cognitive workloads had the highest NASA-TLX scores including mental demands, temporal demands, and effort. The neck area had the highest overall levels of discomfort followed by upper back. The highest standard deviation for COP shift and number of micromovements occurred for medium cognitive workloads. While there were some interesting trends, few trends reached a statistical significance due to high variability among subjects for the outcome variables. |
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| Keywords: | Mental demand Simulation Workload Static seated postures Center of pressure |
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