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      Qualidade de sono, atividade física durante o tempo de lazer e esforço físico no trabalho entre trabalhadores noturnos de uma indústria cerâmica Translated title: Sleep quality, physical activity during leisure time and physical effort at work among night workers of a ceramic industry

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          Abstract

          Este estudo teve o objetivo de verificar a relação entre qualidade do sono e atividade física durante o tempo de lazer entre trabalhadores noturnos com um elevado esforço físico no trabalho (média de 14.245; DP 3.456 kcal/semana). Também foi avaliada a relação entre a qualidade do sono e o nível do esforço físico no trabalho. Um total de 19 trabalhadores noturnos de uma indústria cerâmica respondeu o índice da qualidade do sono de Pittsburgh (PSQI) e o questionário internacional da atividade física (IPAQ). Foi calculado o dispêndio calórico total por semana para cada trabalhador através do equivalente metabólico (METs). Os trabalhadores foram distribuídos em dois grupos, de acordo com os escores do PSQI. Foi realizada a análise descritiva dos dados por meio de médias, valores mínimo e máximo, proporções e desvios-padrão. A relação entre qualidade do sono e atividade física foi avaliada pelo teste Mann-Whitney. O grupo de qualidade do sono ruim mostrou nível mais elevado de gasto energético no trabalho que o outro grupo, o que sugere uma relação entre gasto energético no trabalho e qualidade de sono. Distúrbios do sono e sonolência diurna também contribuíram para a qualidade de sono ruim. Esses resultados, embora preliminares, revelam uma tendência de que o elevado esforço físico no trabalho noturno contribui para baixa qualidade de sono.

          Translated abstract

          This study aimed at verifying the relationship between sleep quality and physical activity during leisure time among night workers with high physical effort at work (average 14,245; SD 3,456 kcal/week). Also, the relationship between sleep quality and level of physical effort at work was evaluated. A total of 19 night workers of a ceramic industry filled in the Pittsburgh Sleep Quality Index (PSQI) and the International Physical Activity Questionnaire (IPAQ). The total energy expenditure per week for each worker was expressed by the metabolic equivalent (METs). Workers were distributed in two groups, according to the PSQI scores. We performed the descriptive analysis of data, calculating average, minimum and maximum values, percentages and standard deviations. The relationship between quality of sleep and physical activity was assessed by Mann-Whitney Test. The poor sleep quality group showed higher level of energy expenditure at work than the other group, suggesting a relationship between energy expenditure at work and sleep quality. Sleep disorders and diurnal sleepiness contributed to the poor sleep quality as well. Although these are preliminary results, they indicate that higher physical effort exerted at night work contributes to low sleep quality.

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          Most cited references28

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          Obesity: preventing and managing the global epidemic

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            Sleep disturbances, work stress and work hours: a cross-sectional study.

            The study examined the multivariate relationship between disturbed sleep and different work-related and background/life style factors. 5720 healthy employed men and women living in the greater Stockholm area participated. A factor analysis of eight items provided one main factor: "disturbed sleep." The data were analyzed using a multiple logistic regression analysis against the index disturbed sleep as well as the separate items "not well rested" and "difficulties awakening." The results showed that high work demands [odds ratio (OR) = 2.15] and physical effort at work (OR = 1.94) are risk indicators for disturbed sleep, while high social support is associated with reduced risk (OR = 0.44). In addition, higher age (45+), female gender, a high body mass index (BMI) and lack of exercise are background/life style risk indicators. Introducing into the model an item representing inability to stop thinking about work during free time yielded the highest OR (3.20) and forced work demands out of the regression. With regard to not feeling well rested, the same significant predictors, except physical effort, were obtained, as well as for having night work and being married. In addition, the age effect was reversed--high age predicted reduced risk of not feeling well rested. Difficulties awakening was predicted by high work demands, low social support, being male, low age and smoking. It is notable that, whereas subjective sleep quality decreased with age, the difficulties awakening and feelings of not being well rested after sleep increased with age. It was concluded that stress and the social situation at work are strongly linked to disturbed sleep and impaired awakening, that gender and, even more so, age may modify this and that the inability to stop worrying about work during free time may be an important link in the relation between stress and sleep. Copyright 2002 Elsevier Science Inc.
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              Tai chi and self-rated quality of sleep and daytime sleepiness in older adults: a randomized controlled trial.

              To determine the effectiveness of tai chi on self-rated sleep quality and daytime sleepiness in older adults reporting moderate sleep complaints. Randomized, controlled trial with allocation to tai chi or exercise control. General community. One hundred eighteen women and men aged 60 to 92. Participants were randomized into tai chi or low-impact exercise and participated in a 60-minute session, three times per week, for 24 consecutive weeks. Primary outcome measures were the seven subscales of the Pittsburgh Sleep Quality Index (PSQI), PSQI global score, and Epworth Sleepiness Scale (ESS). Secondary outcome measures were physical performance (single leg stand, timed chair rise, 50-foot speed walk) and 12-item short form (SF-12) physical and mental summary scores. Tai chi participants reported significant improvements in five of the PSQI subscale scores (sleep quality, sleep-onset latency, sleep duration, sleep efficiency, sleep disturbances) (P<.01), PSQI global score (P=.001), and ESS scores (P=.002) in comparison with the low-impact exercise participants. Tai chi participants reported sleep-onset latency of about 18 minutes less per night (95% confidence interval (CI)=-28.64 to -7.12) and sleep duration of about 48 minutes more per night (95% CI=14.71-82.41) than low-impact exercise participants. Tai chi participants also showed better scores in secondary outcome measures than low-impact exercise participants. Both groups reported improvements in SF-12 mental summary scores. Older adults with moderate sleep complaints can improve self-rated sleep quality through a 6-month, low- to moderate-intensity tai chi program. Tai chi appears to be effective as a nonpharmacological approach to sleep enhancement for sleep-disturbed elderly individuals.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                rbso
                Revista Brasileira de Saúde Ocupacional
                Rev. bras. saúde ocup.
                Fundação Jorge Duprat Figueiredo de Segurança e Medicina do Trabalho - FUNDACENTRO (São Paulo )
                2317-6369
                June 2009
                : 34
                : 119
                : 93-100
                Affiliations
                [1 ] Universidade de São Paulo Brazil
                [2 ] Universidade do Extremo Sul Catarinense Brazil
                Article
                S0303-76572009000100011
                10.1590/S0303-76572009000100011
                0be8c1a8-1698-4a22-afd4-48f987781fba

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0303-7657&lng=en
                Categories
                PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH

                Public health
                sleep quality,physical activity,night workers,qualidade do sono,atividade física,trabalhadores noturnos

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