Effect of tart cherry juice (Prunus cerasus) on melatonin levels and enhanced sleep quality
- Glyn HowatsonAffiliated withSchool of Life Sciences, Northumbria UniversityCentre for Aquatic Research, Department of Zoology, University of Johannesburg Email author
- , Phillip G. BellAffiliated withSchool of Life Sciences, Northumbria University
- , Jamie TallentAffiliated withSchool of Life Sciences, Northumbria University
- , Benita MiddletonAffiliated withCentre for Chronobiology, Faculty of Health and Medical Sciences, University of Surrey
- , Malachy P. McHughAffiliated withNicholas Institute of Sports Medicine and Athletic Trauma, Lenox Hill Hospital
- , Jason EllisAffiliated withSchool of Life Sciences, Northumbria University
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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.
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.
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.
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.
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.
KeywordsTart cherries Melatonin Sleep Recovery
- Effect of tart cherry juice (Prunus cerasus) on melatonin levels and enhanced sleep quality
European Journal of Nutrition
Volume 51, Issue 8 , pp 909-916
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- 1. School of Life Sciences, Northumbria University, Northumberland Building, Newcastle upon Tyne, NE1 8ST, UK
- 4. Centre for Aquatic Research, Department of Zoology, University of Johannesburg, Johannesburg, South Africa
- 2. Centre for Chronobiology, Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK
- 3. Nicholas Institute of Sports Medicine and Athletic Trauma, Lenox Hill Hospital, New York, NY, USA