Characterization of the Dynamics of Sitting During a Sustained and Mentally Demanding Computer Task

  • Pascal MadeleineEmail author
  • Ramtin Zargari Marandi
  • Kristoffer Larsen Norheim
  • Nicolas Vuillerme
  • Afshin Samani
Conference paper
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 824)


This laboratory study studied the dynamics of sitting during a sustained and mentally demanding computer task. Mental fatigue ratings, overall performance and kinetic were recorded in 20 asymptomatic computer users performing computer work for 40 min divided in 12 time epochs. The displacement of the center of pressure (COP) in anterior-posterior (AP) and medial-lateral (ML) directions was calculated. The average, standard deviation, and sample entropy values were computed from the COP time series to assess respectively, the magnitude, size and complexity of sitting dynamics. Fatigue ratings significantly increased from before to after the computer task while the overall performance did not change significantly over time. Likewise, the direction of displacement of the COP did not affect significantly the AVG but resulted in larger SD and SaEn values in the ML direction compared with AP direction. Time did not play a significant role on any of the outcome measures. The present study demonstrated that the sitting dynamics can be assessed in an ecological environment, e.g. in office chairs. Further, we found that 40 min seated computer work did not changed the dynamics of sitting. On the contrary, we observed increased size and structure of variability in the ML than the AP direction. This latter finding can be used to design office chairs or interventions aiming at preventing discomfort due to long time sitting.


Nonlinear dynamics Sitting control Variability 



The project was partly funded by Veluxfonden (Project no 00010912).


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Sports Sciences, Department of Health Science and Technology, Faculty of MedicineAalborg UniversityAalborgDenmark
  2. 2.University Grenoble-Alpes, AGEISGrenobleFrance
  3. 3.Clinic of Occupational MedicineAalborg University HospitalAalborgDenmark

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