An Epidemiological Study on Relationship between the Hours of Sleep and Life Style Factors in Japanese Factory Workers.

Abstract

To prevent "life style-related diseases", it is necessary to evaluate not only the factors directly related to sleep but also the relationship between sleep and other life style-related factors (such as smoking, alcohol drinking, food habits, and exercise routines). There have b e e n n o e x t e n si v e st ud i e s c o n d u c t e d o n t h e s e relationships. A survey was conducted on 2,000 employees of a large plant over a 6-year period to provide data that would allow one to analyze correlation between hours of sleep and other life style factors, such as smoking, alcohol drinking, dietary habit, and exercise. It focused on a serial evaluation, with special reference to the correlation between sleep and smoking and drinking habits, exercise, and food habits. In relation to smoking or an alcohol drinking habit, no significant correlation was found between those who did not get enough sleep and those who got adequate sleep. For the dietary habits, the group with insufficient hours of sleep was related to a less than satisfactory frequency of meal taking, irregularity of eating, snacking habits, excessive seasoning of food, and consumption of insufficient quantities of vegetables. Conversely, it was recognized that those who have satisfactory food habits are more likely to enjoy an appropriate amount of sleep. Those who fail to get sufficient sleep engage in food habits that are more likely to cause life style-related diseases. J Physiol A n t h r o p o l 2 1 ( 2 ) : 1 1 5 -1 2 0 , 2 0 0 2 h t t p : / / www.jstage.jst.go.jp/en/

An Epidemiologic Review on Occupational Sleep Research among Japanese Workers

“…One was MEDLINE for use in search of research paper published in 1966-2004, studying Japanese working subjects, written in either English or Japanese. The other was Igaku Chuo Zasshi CD-ROM database, in which Japan Centra Revuo Medicina covered 2,360 medical, dental and pharmacological periodicals published in Japan between 1987 Y DOI Industrial Health 2005, 43, [3][4][5][6][7][8][9][10] and 2004. The following terms combined were searched in article titles and keywords to single out the articles reviewed: sleep AND epidemiology AND Japan* AND [work*, employ* or job].…”

“…Most of the studies reviewed here tried to detect risk or associated factors of sleep problems (e.g., DIS, DMS, EMA, insomnia, poor sleep quality, EDS) 5-7, 9-14, 16-25, 27, 28) and sleep length 8,15,26) . Main research topics on sleep correlates in the studies for non-shift workers could be categorized into four: (1) pathophysiology [5][6][7]9) ; (2) lifestyle behaviors 5,8,14,17) ; (3) job-related conditions 5, 6, 10-13 15) ; and (4) psychopathology 5,6,10,16,17) .…”

“…Main research topics on sleep correlates in the studies for non-shift workers could be categorized into four: (1) pathophysiology [5][6][7]9) ; (2) lifestyle behaviors 5,8,14,17) ; (3) job-related conditions 5, 6, 10-13 15) ; and (4) psychopathology 5,6,10,16,17) . Kawaguchi et al 5) reported the association of DMS with a multifaceted syndrome 39,40) , a clustering of metabolic disorders including hypertension, obesity, lipid abnormalities, non-insulin-dependent diabetes mellitus and atherosclerotic cardiovascular disease, and implied the possibility that a specific higher activity of metabolic status might cause sleep disorders.…”

The Mediating Effect of Sleep Quality on the Relationship between PTSD and Physical Activity

“…In general, more sleep is associated with increased levels of physical activity, 5,6 although one epidemiological study did not see this association. 7 While more research has assessed the infl uence of physical activity on sleep, the relationship between the two factors has been proposed to be bidirectional, 8 and a growing literature supports the effects of sleep on physical activity. For example, a recent study of 11 women with insomnia tracked for 16 weeks demonstrated that sleep infl uenced next day exercise (i.e., longer sleep onset was associated with shorter next-day exercise duration); interestingly, in this sample, exercise did not have an effect on subsequent sleep.…”

Effects of Diet on Sleep Quality

“…Studies have shown that short sleepers have higher energy intakes, notably from fat (4,5) and snacks (6), than do normal sleepers. NHANES data in the United States showed that short sleepers, generally defined as those who sleep <7 h/night, consume a smaller variety of foods, with lower protein, carbohydrate, fiber, and fat intakes relative to normal sleepers who report 7-8 h of sleep/night (7).…”