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Related Experiment Video

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Relationship between mental workload and salivary cortisol levels: A field study.

Mojgan Zoaktafi1, Reza Kazemi2, Alireza Choobineh2

  • 1Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.

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Summary

Salivary cortisol may not effectively measure mental workload in power plant technicians. High workload was observed, but cortisol levels did not correlate significantly, likely due to circadian rhythms.

Keywords:
NASA-TLXVACPbiochemical indicesmental workloadpower plant

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Area of Science:

  • Occupational Health
  • Human-Machine Interface Research
  • Psychophysiology

Background:

  • Assessing mental workload (MW) is crucial for developing effective human-machine interfaces in industrial settings.
  • Understanding MW impacts worker performance and safety in complex operational environments.

Purpose of the Study:

  • To investigate the correlation between mental workload and salivary cortisol levels in technicians at an Iranian combined cycle power plant.
  • To evaluate the utility of salivary cortisol as a physiological indicator of MW in an industrial context.

Main Methods:

  • A pilot study involved 18 technicians, employing task analysis to categorize operations.
  • Mental workload was assessed using the Visual, Auditory, Cognitive, and Psychomotor (VACP) technique and the NASA Task Load Index (NASA-TLX) questionnaire.
  • Salivary samples were collected at four time points on both working and off days, with Pearson correlation analysis used to examine relationships.

Main Results:

  • Subjective assessments indicated a high level of mental workload among all participating technicians.
  • No statistically significant association was found between MW assessed by NASA-TLX or VACP and salivary cortisol concentrations (p=0.081).

Conclusions:

  • Salivary cortisol may not be a reliable physiological marker for assessing mental workload in this population.
  • Cortisol level variability, influenced by circadian rhythms, potentially confounds its use as a direct MW indicator.