czeisler
- Created by: Soancosoanco
- Created on: 20-02-20 11:08
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- Czeisler
- Background
- Around 30% of Americans work shift patterns, and they have impacts on their physical/ mental health
- Aims
- Investigate job satisfaction/ staff turnover/ health/ productivity
- Create a better work schedule for phase delay rather than phase advance
- Assess impact of new work schedule
- Method
- Quasi-experiment
- IV: shift pattern of workers
- Field study as it was in workplaces
- DV: sleep attitudes/ behaviours/ job satisfaction measured with question-naires
- 85 males, age 19-68 (mean: 31.4). All worked on rotating shifts on Salt Lake Minerals, USA
- Control group: 68 males on non-rotating shifts, same area, 19-56 (mean: 27.3)
- Procedure
- Ps' were on a phase advance pattern, which is harder to adjust to. The shift pattern had been used for 10y
- Before: Ps' got question-naires on sleep-wake preference/ schedule preference/ job descriptive index for satisfaction/ health index
- Question-naires given before change in shifts and 3 months after
- After: Workers/ managers were given advice on sleeping patterns and an intervention was enforced. Shifts changed to phase delay, and a 21 day rotation rather than 7. Question-naires were given to review the intervention
- Results
- Before: response rate was 84%. "Rotators" had significantly more insomnia issues, and nearly 30% fell asleep at least once in the last 3 months at work. 80%+ said it took 2-4 days to adjust to sleep, the others never adjusted. 90% think shifts change too frequently
- After: Shift change complaints went from 90% to 20% (they preferred 21 day patterns). There was better satisfaction/ health, and a reduction in staff turnover. There was a significant productivity increase
- Conclusions
- Phase delay shift work and time to adjust fits better with circadian rhythms
- Changing shift patterns = improvement for employee and employer
- Companies who rely on shift work (phase delay) might have increased productivity/ lower staff turnover/ higher satisfaction
- Background
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