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Pham Q.-C.,Federal University of ABC | De Mello M.T.,Centro Multidisciplinar em Sonolencia e Acidentes | De Mello M.T.,University of Sao Paulo | Narciso F.V.,Centro Multidisciplinar em Sonolencia e Acidentes | And 13 more authors.
Revista Brasileira de Engenharia Biomedica | Year: 2014

Introduction: Sleepiness is responsible for a considerable proportion of traffic accidents. It is thus an important traffic safety issue to find a robust, objective and practical way to estimate the amount of time a person has been awake. To attempt to meet this goal, we investigated the relationship between sleepiness and posture control. Methods: Subjects were kept awake for 36 hours and posturographic data during quiet standing were collected every two hours by means of a force platform. The standing surface (rigid surface or foam surface) and visual (eyes open or eyes closed) conditions were manipulated. Results: In the more challenging conditions (with foam surface and/or eyes closed), the body sway variables derived from the center of the pressure measurement increased significantly when time since awakening became greater than 21 h in almost all subjects. Conclusion: Based on this result, we propose a practical protocol that could robustly assess whether time since awakening was greater than 21 h. © 2014 Sociedade Brasileira de Engenharia Biomedica. All rights reserved.

Narciso F.V.,Centro Multidisciplinar em Sonolencia e Acidentes | Narciso F.V.,University of Sao Paulo | Esteves A.M.,University of Campinas | Oliveira E Silva L.,Centro Multidisciplinar em Sonolencia e Acidentes | And 6 more authors.
Medical Principles and Practice | Year: 2013

Objective: The objective of this study was to analyze the effect of individual circadian preferences of drivers with fixed night work schedules on sleep patterns. Subjects and Methods: A total of 123 professional drivers, 32 indifferent preference drivers and 91 morning preference drivers of an intermunicipality and interstate bus transportation company were evaluated. All drivers underwent polysomnographic recordings after their shifts. Furthermore, they filled out a questionnaire that contained sociodemographic and health questions. The Horne and Östberg questionnaire was used to assess the subjects' morningness-eveningness preference. Results: The mean age was 42.54 ± 6.98 years and 82 (66.66%) of the drivers had worked for ≥15 years. A significant effect on rapid eye movement (REM) was observed in the morning preference drivers. They showed an increased sleep latency and an REM sleep percentage of 5% of the total REM time. This reveals a significant effect on sleep architecture associated with work time. Conclusion: The drivers reported that morning preference had a significant effect on their sleep pattern indicating less REM sleep and longer REM sleep latency in the morning preference group. Thus, it is important to evaluate interactions between individual aspects of health and other parameters, such as sleep quality and work organizational factors, to promote night shift workers' health and well-being. © 2013 S. Karger AG, Basel.

Silva L.O.,Centro Multidisciplinar em Sonolencia e Acidentes | Esteves A.M.,University of Campinas | Alves N.N.L.,Centro Multidisciplinar em Sonolencia e Acidentes | Carvalho A.N.S.,Centro Multidisciplinar em Sonolencia e Acidentes | And 5 more authors.
Sleep Science | Year: 2012

Objectives: Rotating or night shifts elicit rapid changes in physiology which the body cannot quickly adapt. In addition, alterations in shift work influence social and familial aspects that ultimately impact the quality of life of these workers. The purpose of this study was to evaluate mood and sleep patterns as well the effects of physical exercise on the quality of life of train operators that work in shifts. Methods: This study was performed with 336 male train operators who worked on a rotating shift in a Brazilian company. The train operators underwent a polysomnography and subjective evaluations were made through the use of the following questionnaires: quality of life, work ability index, physical activity, anxiety, depression and sleepiness. Statistical analysis was performed using linear regressions, which the SF-36 scores were used as the dependent variable, and the sleep pattern variables (REM and sleep efficacy) and the subjective variables were used as independent variables. They were all adjusted for age and body mass index. Results: Alterations in the mood profile, low work capacity, sleepiness and altered of REM sleep had a negative impact while physical exercise contributed positively to the quality of life of Brazilian shift workers. Conclusion: Shift workers with impaired mood profiles and sleep patterns have a negative impact on quality of life, in contrast to shift workers who engage in physical activity.

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