黃金睡眠時間 7小時剛剛好

[MK]

http://tw.news.yahoo.com/article/url/d/ ... 2ab2s.html
更新日期:2010/08/02 04:11
〔編譯張沛元／綜合報導〕根據1日發表的最新研究，一天睡眠時間（包括打盹）少於或超過7小時都不好，有增加罹患心血管疾病機率之虞。如果一天睡眠時間超過9小時，罹患心血管疾病的機率，是一天睡7小時者的1.5倍。


睡太多太少 都會增加心血管疾病機率

西維吉尼亞大學醫學系的研究人員指出，一天睡少於5小時（包括打盹）者，罹患心絞痛、冠心病、心臟病或中風的機率倍增；至於睡眠多於7小時者，則有增加罹患心血管疾病之虞。這篇發表在「睡眠」期刊的研究報告指出，睡眠時間不足7小時的最危險族群，是60歲以下、每天睡眠5小時或更少的成年人；這些人罹患心血管疾病的機率，是每天睡足7小時者的3倍。女性若每天只睡5小時或更少（包括打盹），罹患心血管疾病的機率增加2倍半。該研究指出，睡眠持續時間過短與心絞痛有關，而睡太少與太多則與心臟病及中風有關。


同樣刊載於「睡眠」期刊的另外一篇研究指出，對那些不得不縮短睡眠時間的人而言，偶爾好好睡一覺對健康也有幫助。賓州大學醫學系睡眠與時間生物學小組負責人丁吉斯發現，142名睡眠時間持續5天遭嚴重剝奪的成年人（即多數人每週5天因工作犧牲睡眠），其反應時間較慢，且很難集中精神。


但在好好睡了一覺之後，該研究受試者的警覺性明顯改善，其中改善最大的是那些歷經一週5天每天只睡4小時、之後好好睡了10小時的人。丁吉斯說，在經過一段睡眠不足的期間後，額外多睡1、2個小時對恢復行為警覺性確實有所助益。

[MK]

原文出處:
http://www.journalsleep.org/ViewAbstract.aspx?pid=27857

Sleep Duration and Cardiovascular Disease: Results from the National Health Interview Survey

Charumathi Sabanayagam, MD, PhD; Anoop Shankar, MD, PhD

Department of Community Medicine, West Virginia University School of Medicine, Morgantown, WV

Background:
Previous studies have shown that both short and long sleep durations are related to increased likelihood of diabetes and hypertension. However, the relation between sleep duration and cardiovascular disease (CVD) is not clear. We examined the hypothesis that compared with sleep duration of 7 hours, shorter and longer sleep durations are independently related to CVD.

Methods:
We conducted a cross-sectional study of 30,397 National Health Interview Survey 2005 participants ≥ 18 years of age (57.1% women). Sleep duration was categorized as ≤ 5 hours, 6 hours, 7 hours, 8 hours, and ≥ 9 hours. The main outcome of interest was the presence of any CVD (n = 2146), including myocardial infarction, angina, and stroke.

Results:
We found both short and long sleep durations to be independently associated with CVD, independent of age, sex, race-ethnicity, smoking, alcohol intake, body mass index, physical activity, diabetes mellitus, hypertension, and depression. Compared with a sleep duration of 7 h (referent), the multivariate odds ratio (95% confidence interval) of CVD was 2.20 (1.78, 2.71), 1.33 (1.13, 1.57), 1.23 (1.06, 1.41), and 1.57 (1.31, 1.89) for sleep duration ≤ 5 h, 6 h, 8 h, and ≥ 9 h. This association persisted in subgroup analyses by gender, race-ethnicity, and body mass index categories. Also, similar associations were observed when we examined myocardial infarction and stroke separately.

Conclusion:
Compared with sleep duration of 7 h, there was a positive association between both shorter and longer sleep durations and CVD in a representative sample of US adults. These results suggest that sleep duration may be an important marker of CVD.

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