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At least 145 records · Page 8Linked to original sources
PubMed2002

Reduced risk for overweight and obesity in 5- and 6-y-old children by duration of sleep--a cross-sectional study.

OBJECTIVE: To assess the relationship between sleep duration and adiposity in 5- and 6-y-old Bavarian children. DESIGN: Cross-sectional study. SUBJECTS: A total of 6862 German children aged 5-6 y participating in the obligatory health examination in Bavaria, southern Germany. MEASUREMENTS: Routine data were collected on the height and weight of children at the time of school entry in six public health offices in 1999 and in another two in 2000. Body fat mass was estimated by BIA performed in three of those offices. An extensive questionnaire was given to all children's parents in order to assess risk factors for overweight and obesity. The main outcome measures were overweight, defined by a body mass index (BMI) above the 90th centile and obesity, defined by a BMI above the 97th centile for the German children in Bavaria. Excessive body fat was defined as fat mass above the 90th centile for all German children seen in this survey. The main exposure was usual sleeping hours on week days. RESULTS: The prevalence of obesity decreased by duration of sleep: < or =10 h, 5.4% (95% CI 4.1-7.0), 10.5-11.0 h, 2.8% (95% CI 2.3-3.3), and > or =11.5 h, 2.1% (95% CI 1.5-2.9). Similar relations were found with the prevalence of overweight and excessive body fat. These effects could not be explained by confounding due to a wide range of constitutional, sociodemographic and lifestyle factors. The adjusted odds ratio for obesity were: for sleeping 10.5-11.0 h, 0.52 (95% CI 0.34-0.78) and 0.46 (95% CI 0.28-0.75) for sleeping 11.5 h. CONCLUSION: The effect of sleep duration on obesity in children reflects a higher body fat composition and appears to be independent of other risk factors for childhood obesity.

Adipose Tissue↗
PubMed2006

Actigraphic investigations on the activity-rest behavior of right- and left-handed students.

The aim of this study was to explore differences between left-and right-handed subjects in sleep duration. Sleep and activity patterns were continuously registered for 12 days using actometers on 20 left-handed and 20 right-handed medical students in Berlin. Handedness was determined by a modified version of the Edinburgh handedness inventory. Each participant wore one actometer on each wrist. Actiwatch Sleep Analysis Software (CNT, UK) was used to evaluate the data, and statistical calculations were performed with a non-parametric variance analysis. A significant difference in mean sleep duration between left-handers (7.9 h) and right-handers (7.3 h) was determined (p=0.025 for measurement made on the dominant hand and p=0.013 for ones made on the non-dominant hand). In contrast, the maximal phase of daily activity (acrophase) did not show any difference between the two groups. The difference in sleep duration might be caused by either the greater effort required for left-handers to cope in a right-handed world or by structural brain differences.

Activity Cycles↗
PubMed2003

Are there gender differences in objective and subjective sleep measures? A study of insomniacs and healthy controls.

It is well known that insomnia is more frequent in women than in men throughout all age groups. In this respect insomnia resembles other psychiatric disorders that occur more frequently in women such as anxiety and depressive disorders. Since insomnia is frequently a symptom of anxiety and depression, it remains an open question whether the comorbidity with psychiatric disorders fully explains the gender differences in the prevalence of insomnia or whether gender influences sleep independently from psychiatric conditions. We analyzed sleep measures of patients diagnosed with a primary insomnia (n=86) and of an age- and sex-matched healthy control group (n=86) by polysomnography; additionally, subjective rating scales were available for 70 patients and 54 controls matched for mean age and sex ratio. Surprisingly, none of the sleep continuity measures (sleep duration, sleep efficiency, arousal index, and wake%), nor slow wave or REM sleep % showed significant gender differences in both insomniacs and healthy controls. Also, subjective estimates of sleep quality were comparable in both sexes. As expected, insomniacs strongly differed from the control group in all subjective measures of sleep. Polysomnography showed significantly reduced sleep duration and efficiency, increased arousal index, and slightly, but significantly, less REM sleep in the insomniacs as compared to the healthy controls. These studies indicate that gender seems to have, if any, relatively little influence on sleep per se. We hypothesize that the clear gender differences in the prevalence of insomnia are caused predominantly by gender differences in the prevalence of anxiety and depression. Primary insomnia may be, at least in a part of the cases, a subclinical or subthreshold form of anxiety or depression.

Adolescent↗
PubMed1990

Subjective sleep characteristics as coronary risk factors, their association with Type A behaviour and vital exhaustion.

A deviant habitual sleep duration, sleep complaints, frequent napping and snoring have all been suggested as potential risk factors for future coronary heart disease. It has not been studied thoroughly, however, whether the association of these phenomena with coronary heart disease is confounded by Type A behaviour or by a state of vital exhaustion. The aim of the present study was to explore the association of the above sleep characteristics with the coronary risk factors, 'Type A behaviour' and 'vital exhaustion' systematically. The results indicated that Type A behaviour was not associated with any of these sleep characteristics, except with frequent waking. Exhausted subjects, however, reported chronic sleep complaints, a short sleep duration and frequent napping significantly more often than vital subjects. Type A behaviour did not confound these associations. The data support the assumption that these sleep characteristics can be considered as potential risk factors for coronary heart disease because of their association with vital exhaustion.

Aged↗
PubMed2000

Prevalence and correlates of self-reported sleep problems among Chinese adolescents.

STUDY OBJECTIVES: This study examined the prevalence and correlates of sleep problems in Chinese adolescents. DESIGN AND SETTING: An epidemiological questionnaire survey was carried out in five high schools in Shandong Province of Mainland China. PARTICIPANTS: A total of 1365 adolescents between the ages of 12 and 18 years comprising 823 boys and 542 girls. MEASUREMENTS AND INTERVENTIONS: The participants completed a self-administered questionnaire regarding sleep duration, sleep problems, stressful life events, lifestyles, and personal and family characteristics. RESULTS: Mean sleep duration at night was 7.64 hours (SD = 0.86) and decreased with increasing age. Of the sample, 16.9% (95% CI = 13.2-20.5%) reported insomnia symptoms including difficulty initiating sleep (10.8%), difficulty maintaining sleep (6.3%), and early morning awakening (2.1%). Nightmares were reported more frequently by girls (chi2=20.09, p<0.001). Only 2.3% of the sample had ever taken hypnotic medication during the past month. Almost 22% of the subjects went to bed later than 12:00 PM at least once a week. Multiple logistic regression analysis showed that greater age, being at senior high school, doing no habitual physical exercise, poor physical health, self-selection of diet, longer distance from home to school, and life stress experienced during the past 12 months were significantly associated with an increased risk of insomnia. CONCLUSIONS: Self-reported sleep problems in Chinese adolescents are common and associated with multiple factors. These findings suggest the need for comprehensive programs to prevent sleep problems in adolescents.

Adolescent↗
PubMed2004

Tai chi and self-rated quality of sleep and daytime sleepiness in older adults: a randomized controlled trial.

OBJECTIVES: To determine the effectiveness of tai chi on self-rated sleep quality and daytime sleepiness in older adults reporting moderate sleep complaints. DESIGN: Randomized, controlled trial with allocation to tai chi or exercise control. SETTING: General community. PARTICIPANTS: One hundred eighteen women and men aged 60 to 92. INTERVENTION: 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. MEASUREMENTS: 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. RESULTS: 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. CONCLUSION: 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.

Aged↗
PubMed2005

Does sleep quality affect involuntary attention switching system?

We studied the relationship between sleep quality and quantity and subsequently recorded automatically evoked event-related potential (ERP) responses. In previous studies decrement of attentional processing has been associated with changes in sleep. Sleep is shown to associate also with ERPs elicited by unattended sound stream, however, there is no consensus on these effects. A recent study suggested that the early anterior P3a to novel stimuli in attended stream is attenuated and the late parietal P3a is strengthened by total sleep deprivation. We carried out 72-h consecutive actigraphy measurements in a naturalistic setting to collect information about variation in sleep duration, sleep onset latency, sleep efficiency, and percentage of sleep. MMN and P3a deflections to infrequent changes in sound duration and pitch in unattended sound stream were obtained in a separate recording session from the same subjects when they were awake. No significant correlations were found between sleep and MMN parameters, indicating that MMN is resistant to normal variation in sleep. However, P3a to both pitch and duration changes correlated positively with sleep onset latency, and P3a to duration changes correlated negatively with sleep efficiency and percentage of sleep. The correlation was higher in the posterior scalp areas. Our results suggest that the involuntary attention switching system, reflected by the P3a is sensitized as a function of decreased sleep quality.

Acoustic Stimulation↗
PubMed2000

Sleep loss and daytime sleepiness in the general adult population of Japan.

There are few epidemiological studies on sleep loss and daytime sleepiness in the general adult population of Japan. A total of 4000 adult people, aged 20 and over, were randomly drawn from five areas of Japan, and 3030 individuals were interviewed and completed a questionnaire including information about sleep duration and sleep problems. Overall, 29% slept less than 6 h at night, 23% reported having insufficient sleep, and 6% took sleep enhancing medications. The prevalence rates were 21% for symptoms of insomnia and 15% for excessive daytime sleepiness. Symptoms of insomnia were more prevalent in the elderly, whereas young people were more likely to report short sleep duration, subjective insufficient sleep and excessive daytime sleepiness. A multiple logistic regression model revealed that excessive daytime sleepiness had significant associations with young people, short sleep duration, insomnia symptoms, subjective insufficient sleep and sleep enhancing medication use. Short sleep duration was the strongest predictor of excessive daytime sleepiness. The findings indicate that sleep loss and excessive daytime sleepiness in the Japanese adult population are common, and comparable to those reported in Western countries. Excessive daytime sleepiness in the general adult population seems more likely to be attributed to short sleep duration.

Adult↗
PubMed1992

[Interindividual differences in tolerance to shift work and characteristics of shift workers: relation between the quality and duration of sleep and certain worker characteristics].

The investigation aimed at examining the relationship between the quality and duration of sleep on the one hand and various shift workers' characteristics on the other, as well as establishing whether sleep characteristics were congruent with some other indices of night shift tolerance. A total of 604 rotating shift workers working in a fast rotating shift system were administered a battery of questionnaires. The results showed that sleep quality was related to their many characteristics, especially to neuroticism, rigidity of sleeping habits, flexibility of habits, and relaxedness. Actually, the shift workers' characteristics accounted for a notable percentage (48%) of interindividual differences in sleep quality. However, there were fewer traits related to sleep duration than to sleep quality so that only a small percentage of interindividual differences in sleep duration could be explained (12-30%). Sleep quality proved to be a good indicator of night shift tolerance. The results concerning sleep duration indicated only sleep duration on the afternoon shift and days off, as well as average sleep duration in the complete shift cycle, to be relatively good indices of night shift tolerance.

Adult↗