Insights & Discussion
Cherry juice increases sleep time and efficiency in older adults with insomnia, potentially due to its inhibition of a process that degrades tryptophan and stimulates inflammation.
The study followed a placebo-controlled balanced crossover design, with subjects older than 50 years old with insomnia being randomized to either placebo or cherry juice consumption twice daily for two weeks, with a two-week washout period in between. Sleep was evaluated using polysomnography and five validated questionnaires, while serum measurements were conducted for several bio-indicators. In vitro studies were also performed to determine the ability of cherry juice components to inhibit a specific physiological process.
The study found that sleep time increased by 84 minutes per polysomnography evaluations and sleep efficiency increased per the Pittsburgh Sleep Quality Index. Serum measurements revealed decreased levels of certain bio-indicators suggesting reduced inflammation. In vitro studies also found that components present in cherry juice inhibited a specific process that degrades the amino acid tryptophan, potentially leading to these improved sleep outcomes. Other questionnaires, however, showed no significant differences in results.
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Walnut consumption while doing concurrent training improves strength, sleep quality, standing support, cognitive performance and postural balance in elderly men.
2024 Aging Clinical and Experimental Research Concurrent training associated with moderate walnut consumption improved isokinetic strength, subjective sleep quality, cognitive performance and postural balance in elderly active men: a randomized controlled trial Kamoun A, Yahia A, Farjallah MA, Maaloul R, Marzougui H, Bouaziz M, et al.
Randomised Controlled Trial Sleep Walnut
In the study, twenty healthy elderly men were grouped into two randomly controlled cohorts. There were three training sessions per week featuring a concurrent combination of strength and endurance training. One group received a diet supplemented with 15 grams per day of walnuts (CTW) over six weeks while the other didn't (CT). Their strength, sleep quality, cognitive performance and postural balance were evaluated using an isokinetic strength test, Spiegel questionnaire, Montreal cognitive assessment and balance measurements respectively, 48 hours before and after the intervention period.
The results pointed that both groups experienced significant improvements in strength and sleep quality with CTW showing a greater increase in sleep quality. CTW group showed improvements in cognitive performance and postural balance while CT group did not see these benefits. Hence it's observed that combination of concurrent training and walnut consumption was found to be effective in improving strength, sleep quality, cognitive performance and postural balance in elderly men.
There is evidence to support significant improvements to total sleep time and sleep efficiency with the ingestion of tart cherries.
2023 Current Sleep Medicine Reports Too Sour to be True? Tart Cherries (Prunus cerasus) and Sleep: a Systematic Review and Meta-analysis Stretton B, Eranki A, Kovoor J, Bacchi S, Gupta A, Maddern G, et al.
Systematic Review Cherry Insomnia Sleep
We identified a total of 277 unique records, from which 8 studies of low-moderate methodological quality were included in the systematic review. Meta-analysis of subjectively recalled sleep efficiency (SE) and total sleep time (TST) were not significant. Objective SE, however, was significantly higher in the cherry cohort when compared to placebo with an effect size of 0.63 (95% CI 0.29–0.97, P < 0.01). There was low associated heterogeneity (I2 = 0%). Objective TST was significantly higher in the cherry cohorts, with a pooled effect size of 1.21 (95% CI 0.83–1.58, P < 0.01). There was high associated heterogeneity (I2 = 81.5%).
Honey potentially has superior results than cough medication or placebo in curtailing symptoms and enhancing sleep in children with acute cough.
2023 European Journal of Pediatrics Honey for acute cough in children — a systematic review Kuitunen I, Renko M
Systematic Review Children's Health Cough Sleep
Methodology:
This targeted review leveraged multiple databases, such as PubMed, Scopus, CENTRAL, CINAHL, and Web of Science, to extract relevant trials relating to honey's usage in treating acute child cough. By applying a systematic approach, the emphasis was on randomized controlled trials featuring children. To ensure the results' credibility, payment was done for risk-of-bias as well as the quality of the evidence. The studies were not combined owing to the absence of essential information; instead, conclusions provided a range of noticed effects for principal results.
Discussion of results:
Following rigorous screening of almost four hundred papers, a select ten were incorporated. Significant variability in biases was noticed, with two studies possessing a high risk-of-bias and six inviting some concerns. The evidence, though of low to very low quality, indicated honey's potential superiority over placebo/no treatment and cough medication, both in reducing cough frequency and improving sleep quality.
Consuming two medium-sized green kiwifruits an hour before bed can improve sleep quality and recovery stress balance among elite athletes.
2023 Nutrients The Impact of Kiwifruit Consumption on the Sleep and Recovery of Elite Athletes Doherty R, Madigan S, Nevill A, Warrington G, Ellis JG
Clinical Study Kiwifruit Sleep
The study began with an initial assessment, after which all participants were instructed to consume two medium-sized green kiwifruits an hour before bedtime over a 4-week span. Data was collected through baseline and post-intervention questionnaires, as well as daily sleep diary entries throughout the study duration.
There was a notable positive effect of kiwifruit consumption on essential aspects of sleep and recovery in professional athletes. After the intervention period, improvements were observed in sleep quality and recovery stress balances. Additionally, there was an increase in total sleep time, sleep efficiency, and a decrease in the number of times participants woke after falling asleep. The study concludes that kiwifruits positively influence sleep and recovery in high-performing athletes.
The fermented jujube seeds extract significantly enhances sleep by binding to the GABA receptors, thus offers a promising natural alternative for sleep disorders treatment.
2023 Foods Sleep-Enhancing Effect of Water Extract from Jujube (Zizyphus jujuba Mill.) Seeds Fermented by Lactobacillus brevis L32 Bae GY, Ahn Y, Hong KB, Jung EJ, Suh HJ, Jo K
Experimental Study GABA Jujube Sleep
Methodology: An aqueous extract of jujube seeds (ZW) was fermented, following a starch-removing enzymatic degradation process, to increase its γ-aminobutyric acid (GABA) content, resulting in a fermented product (ZW-FM). The sleep-promoting effect of ZW-FM was evaluated using rodent models; specifically, sleep tests were performed on ICR mice with pentobarbital-induced sleep, while the electroencephalography analysis was undertaken in Sprague Dawley rats. Awakening relief effects of ZW-FM were assessed using a caffeine-induced insomnia model. To understand the mechanism, GABA receptor type A (GABA) antagonists were used.
Results: The groups given ZW-FM treatment displayed a longer sleep duration, particularly increased δ-wave time during non-rapid eye movement sleep, and reduced sleep latency. Particularly, the model treated with ZW-FM showed an increase in non-rapid-eye-movement sleep and a reduction in the REM sleep duration, brought about by caffeine treatment. The enhanced sleep induction caused by ZW-FM was hindered by GABA receptor antagonists, thereby validating the involvement of a GABAergic mechanism in promoting sleep.
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