Showing papers on "Chronotype published in 1998"
TL;DR: The results indicated that the phase of circadian rhythms had moved forward from the young to the aged group, and the individual's rhythm, of those that were aged Morning types, showed better agreement with sleep-wake rhythms than did others.
Abstract: The Morningness-Eveningness Questionnaire and Life Habits Inventory were administered to 622 Japanese workers matched for sex and age. We investigated the distributions of the scores on the Morningness-Eveningness Questionnaire and sleep-wake habits by age and sex. Subjects were classified into five age groups and three chronotypes. The distributions and mean scores on the questionnaire advanced slightly toward the Morning type from the young to the aged group. The habitual bedtimes and waking times were significantly earlier in all the chronotypes from the young to the aged group, and the preferred bedtimes and waking times were also clearly earlier from the young to the aged group. The length of sleep was shorter for the Evening than the Morning types, especially in the group below 24 yr. The differences in habitual and preferred sleep length were greater than 1 hour for all age groups, especially the two groups under 34 yr. The number of awakenings during night sleep increased from the young to the age...
47 citations
TL;DR: This study examined age‐related changes in sleep, and relationships between those sleep changes and alterations in the circadian timing system, in a group of middle‐aged and older subjects.
Abstract: OBJECTIVES: Although changes in the circadian timing system are thought to be a major factor in the decline of sleep quality that often accompanies aging, few reports have actually examined this relationship in detail. Because some treatments for age-related insomnia are based on putative circadian changes, it is important to expand the limited database that specifically addresses this issue. This study examined age-related changes in sleep, and relationships between those sleep changes and alterations in the circadian timing system, in a group of middle-aged and older subjects.
DESIGN: Sixty healthy men and women between the ages of 40 and 84 were studied. A subset of older subjects (< 65 years) had reported sleep disturbance for at least 1 year before participation. Polysomnography was obtained, and body core temperature was recorded continuously for 24 hours. All recordings took place in the Laboratory of Human Chronobiology, Department of Psychiatry, Cornell University Medical College.
RESULTS: There were no differences in sleep quality between middle-aged and non-sleep-disturbed older subjects. However, timing of the minimum body temperature was earlier in the older non-sleep-disturbed subjects than in the middle-aged group. In contrast, sleep-disturbed older people had shorter total sleep times, reduced sleep efficiency, more waking time after sleep onset, and a reduced proportion of REM sleep compared with non-sleep-disturbed older subjects. Yet, there were no differences between the two older groups in the rhythm of body temperature. For the entire group, age was correlated negatively with total sleep time, sleep efficiency, percentage of stage 2 sleep, and the timing of the temperature minimum.
CONCLUSION: The results support the widely held notion that sleep and circadian rhythm changes occur with aging. However, the hypothesis that age-related changes in sleep may be associated with aging of the circadian system was supported only to a limited degree, suggesting that age-related sleep disturbance is likely to have multiple causes. Thus, treatment strategies that incorporate a combination of interventions may be the most effective.
45 citations
TL;DR: The aim of this study was to identify, analyzing chronotype differences of subjective hunger sensation between elderly obese subjects compared to non-obese eurettic controls, in association with their affective state.
1 citations
TL;DR: Difficulty in adapting to social life was more severe in patients with non‐24 than in those with DSPS, and it was of psychiatric interest that a considerable number of patients had depressive states in the course of their circadian rhythm sleep disorders.
Abstract: From our practice at the sleep disorders clinic in Kohnodai Hospital, National Center of Neurology and Psychiatry (NCNP), we report the clinical characteristics of circadian sleep-wake rhythm disorders. Nearly 90% of circadian rhythm sleep disorders were diagnosed as delayed sleep phase syndrome (DSPS) or as non-24 sleep-wake syndrome (non-24). While DSPS was equally common in males and females, non-24 was more frequently seen in men. It was of psychiatric interest that a considerable number of patients had depressive states in the course of their circadian rhythm sleep disorders. Difficulty in adapting to social life was more severe in patients with non-24 than in those with DSPS.