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| Author(s): |
Flavio Notarnicola da Silva Borges
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Saúde Pública (FSP/CIR) |
| Defense date: | 2002-06-26 |
| Examining board members: |
Frida Marina Fischer;
Maria Silvia Monteiro;
Lúcia Rotenberg
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| Advisor: | Frida Marina Fischer |
| Abstract | |
Objectives: To evaluate the impact of 12-hour night work followed by 36-hour off on sleep and well-being of health care workers. Methodology: This study was carried out in the Orthopedic Institute of the University hospital of the Medical School of the University of São Paulo, São Paulo, Brazil. Work Ability Index (Ilmarinen, 1992) and fatigue (Yoshitake, 1975) questionnaires, analogue scales for sleep quality and alertness, daily logs and continuous monitoring of sleep and wake periods were used to evaluate health, sleep and well-being of the workers. The daily logs and actigraphs (Ambulatory Monitoring) were used and answered during 2 weeks at least. Exclusion criteria were subjects showing not work-related sleeping disturbances. Perceived quality of sleep were by the use of 10-cm analogue scale. Perceived alertness during night work were registered at 2nd , 6th , and 10th hour of work, during the same period. Analysis of the sleep episodes were according to categories of work and days-off. Results: Fatigue was negatively correlated to age: younger workers (less than 40 years) showed higher scores than older workers. The Work Ability Index showed lower scores for younger workers. Those with lower Work Ability Index also showed higher perception of body fatigue. A significant decrease in the sleep duration was registered after 12-hour nights. Sleep during off-day was mainly at night and was perceived as having better quality; the worst perceived quality of sleep was registered after sleeping before the working night (day sleep). Perceived alertness levels decreased significantly along the night working hours, being worse during dawn hours. Conclusions: Inspite the results are possibly influenced by the healthy worker effect, the studied population showed some decrease of workability. The 12-hour night influenced the perception of the worker\'s sleep quality, decreased duration of the sleep, and this effect might have caused a significant decrease on the perception of alertness. (AU) | |