Voeding en gezondheid

Research question:
Does tea consumption decrease depression risk?

Study design:
This meta-analysis (review article) contained 11 observational studies (22,817 participants with 4,743 cases of depression).

The Begg rank correlation test and the Egger linear regression test indicated no evidence of publication bias [Begg’s test: Z = 0.06, p = 0.951; Egger’s test: t = -0.1, p = 0.925].

Results and conclusions:
The researchers found in the meta-analysis of 22,817 participants with 4,743 cases of depression, a significant 31% decrease [RR = 0.69, 95% CI = 0.63-0.75, I2 = 41.9%] in the risk of developing depression for higher tea consumption compared with low tea consumption. Significant means, there is a relationship at a 95% confidence interval.

The researchers found overall, higher tea consumption had a protective effect against depression in all subgroups except for study location.

The researchers found a significant reduced risk of 32% [RR = 0.68, 95% CI = 0.62-0.75] in Asia populations for higher tea consumption compared with low tea consumption. Significant because RR of 1 was not found in the 95% confidence interval ranging from 0.62 to 0.75. RR of 1 means no relationship or risk.

The researchers found in the dose-response analysis consisted of 10,600 participants with 2,107 cases of depression a significant 37% decrease [95% CI = 0.55-0.71, I2 = 0.00%] in the risk of developing depression for every 3 cups/day increment in tea consumption.

The researchers concluded that higher consumption of tea was associated with lower risk of depression. The dose-response analysis identified a linear association between tea consumption, and the risk of depression, with every 3 cups/day increment in tea consumption associated with a 37% decrease in the risk of depression.

Original title:
Tea consumption and the risk of depression: a meta-analysis of observational studies by Dong X, Yang C, […], Lu Z.

Link:
http://journals.sagepub.com/doi/full/10.1177/0004867414567759

Additional information of El Mondo:
Find more studies/information on tea consumption right here.

Onderzoeksvraag:
Verbetert het slikken van creatine de krachtprestatie, welke geleverd wordt door de bovenste ledematen?

Studieopzet:
Dit overzichtsartikel bevatte 53 RCT’s met in totaal 563 mensen in de creatinegroep en 575 mensen in de controlegroep.

Resultaten en conclusies:
De onderzoekers vonden dat het slikken van creatine de effectiviteit van de bench press (een fitness oefening) deed toenemen [ES = 0.265, 95% BI = 0.132-0.398, p 0.001].

De onderzoekers vonden dat het slikken van creatine de effectiviteit van de chest press (een fitness oefening) deed toenemen [ES = 0.677, 95 % BI = 0.149-1.206, p = 0.012].

De onderzoekers concludeerden dat het slikken van creatine de krachtprestatie welke geleverd wordt door de bovenste ledematen bij sportoefeningen korter dan 3 minuten verbeterde. Deze verbeterde krachtprestatie was onafhanelijk van de bevolkingsgroepen, sportprotocol en de duur en dosis van de creatinesuppletie.

Oorspronkelijke titel:
Creatine Supplementation and Upper Limb Strength Performance: A Systematic Review and Meta-Analysis by Lanhers C, Pereira B, […], Dutheil F.

Link:
http://www.ncbi.nlm.nih.gov/pubmed/27328852

Extra informatie van El Mondo:
Lees hier meer over creatine, sportvoeding en krachttraining.