睡眠不好時，喝一杯櫻桃汁或許有所幫助,。英國研究人員日前完成的一項試驗顯示,，櫻桃汁在延長睡眠時間和改善睡眠質(zhì)量兩方面都有效果。
英國諾森布里亞大學(xué)的研究者在新一期《歐洲營養(yǎng)學(xué)雜志》上報告說,，他們請20名志愿者參與試驗，其中一部分人被要求每天喝兩次30毫升的櫻桃汁,，持續(xù)一個星期,。其他志愿者被編為對照組，不喝這種飲料,。結(jié)果發(fā)現(xiàn),，前一組人每天的睡眠時間平均延長了25分鐘,，而且在他們睡眠時用監(jiān)測儀獲得的數(shù)據(jù)顯示，其睡眠質(zhì)量也有所改善,。
研究人員認(rèn)為,，這與櫻桃汁中含有名為褪黑激素的物質(zhì)有關(guān)，這種物質(zhì)能幫助睡眠,。對飲用櫻桃汁的志愿者進(jìn)行的尿檢也顯示,，其尿液中褪黑激素的含量明顯比對照組要高。
領(lǐng)導(dǎo)這項研究的格林·霍華森說,，試驗表明櫻桃汁有助于改善睡眠,，失眠癥患者和需要倒時差的人都可以嘗試一下這種天然飲品。(生物谷 Bioon.com)
doi:10.1007/s00394-011-0263-7
PMC:
PMID: 22038497
Effect of tart cherry juice (Prunus cerasus) on melatonin levels and enhanced sleep quality.
Howatson G, Bell PG, Tallent J, Middleton B, McHugh MP, Ellis J.
BACKGROUND:
Tart Montmorency cherries have been reported to contain high levels of phytochemicals including melatonin, a molecule critical in regulating the sleep-wake cycle in humans.
PURPOSE:
The aim of our investigation was to ascertain whether ingestion of a tart cherry juice concentrate would increase the urinary melatonin levels in healthy adults and improve sleep quality.
METHODS:
In a randomised, double-blind, placebo-controlled, crossover design, 20 volunteers consumed either a placebo or tart cherry juice concentrate for 7 days. Measures of sleep quality recorded by actigraphy and subjective sleep questionnaires were completed. Sequential urine samples over 48 h were collected and urinary 6-sulfatoxymelatonin (major metabolite of melatonin) determined; cosinor analysis was used to determine melatonin circadian rhythm (mesor, acrophase and amplitude). In addition, total urinary melatonin content was determined over the sampled period. Trial differences were determined using a repeated measures ANOVA.
RESULTS:
Total melatonin content was significantly elevated (P < 0.05) in the cherry juice group, whilst no differences were shown between baseline and placebo trials. There were significant increases in time in bed, total sleep time and sleep efficiency total (P < 0.05) with cherry juice supplementation. Although there was no difference in timing of the melatonin circardian rhythm, there was a trend to a higher mesor and amplitude.
CONCLUSIONS:
These data suggest that consumption of a tart cherry juice concentrate provides an increase in exogenous melatonin that is beneficial in improving sleep duration and quality in healthy men and women and might be of benefit in managing disturbed sleep.
