Predicting shiftwork-related outcomes: shiftwork locus of control and circadian type

Area of Science:

• Occupational Health Psychology
• Chronobiology
• Human Factors

Background:

• Shiftwork is prevalent and associated with numerous health and social challenges.
• Understanding individual differences in adapting to shiftwork is crucial for mitigating negative outcomes.

Purpose of the Study:

• To investigate the predictive utility of the shiftwork locus of control (SHLOC) construct and circadian type measures for shiftwork-related outcomes.
• To explore the relationship between perceived control, circadian typology, and adaptation to shiftwork.

Main Methods:

• 100 shiftworkers completed the SHLOC scale, circadian type measures, and outcome measures at two time points, seven months apart.
• Multivariate regression analyses were employed to assess predictive relationships.

Main Results:

• The SHLOC scale significantly predicted shiftwork-related sleep and social-life problems.
• Circadian type measures were predictive of alertness levels at the seven-month follow-up.
• Individual differences in perceived control and circadian type appear to influence shiftwork tolerance.

Conclusions:

• The SHLOC construct is a viable predictor of specific shiftwork-related disruptions.
• Circadian type is a significant factor in maintaining alertness during shiftwork.
• Personality factors, including locus of control and circadian characteristics, play a key role in an individual's ability to tolerate shiftwork.