The effect of black tea on blood pressure: a systematic review with meta-analysis of randomized controlled trials.

<h4>Objective</h4>Epidemiological evidence has linked consumption of black tea, produced from Camellia sinensis, with a reduced risk of cardiovascular diseases. However, intervention studies on the effects of tea consumption on blood pressure (BP) have reported inconsistent results. Our...

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Autores principales:	Arno Greyling, Rouyanne T Ras, Peter L Zock, Mario Lorenz, Maria T Hopman, Dick H J Thijssen, Richard Draijer
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3bd21a46e6a749d798f2a34970a4aaaa
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spelling	oai:doaj.org-article:3bd21a46e6a749d798f2a34970a4aaaa2021-11-25T06:06:31ZThe effect of black tea on blood pressure: a systematic review with meta-analysis of randomized controlled trials.1932-620310.1371/journal.pone.0103247https://doaj.org/article/3bd21a46e6a749d798f2a34970a4aaaa2014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25079225/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Objective</h4>Epidemiological evidence has linked consumption of black tea, produced from Camellia sinensis, with a reduced risk of cardiovascular diseases. However, intervention studies on the effects of tea consumption on blood pressure (BP) have reported inconsistent results. Our objective was to conduct a systematic literature review with meta-analysis of controlled human intervention studies examining the effect of tea consumption on BP.<h4>Methods</h4>We systematically searched Medline, Biosis, Chemical Abstracts and EMBASE databases through July 2013. For inclusion, studies had to meet the following pre-defined criteria: 1) placebo controlled design in human adults, 2) minimum of 1 week black tea consumption as the sole intervention, 3) reported effects on systolic BP (SBP) or diastolic BP (DBP) or both. A random effects model was used to calculate the pooled overall effect of black tea on BP.<h4>Results</h4>Eleven studies (12 intervention arms, 378 subjects, dose of 4-5 cups of tea) met our inclusion criteria. The pooled mean effect of regular tea ingestion was -1.8 mmHg (95% CI: -2.8, -0.7; P = 0.0013) for SBP and -1.3 mmHg (95% CI: -1.8, -0.8; P<0.0001) for DBP. In covariate analyses, we found that the method of tea preparation (tea extract powders versus leaf tea), baseline SBP and DBP, and the quality score of the study affected the effect size of the tea intervention (all P<0.05). No evidence of publication bias could be detected.<h4>Conclusions</h4>Our meta-analysis indicates that regular consumption of black tea can reduce BP. Although the effect is small, such effects could be important for cardiovascular health at population level.Arno GreylingRouyanne T RasPeter L ZockMario LorenzMaria T HopmanDick H J ThijssenRichard DraijerPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 7, p e103247 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Arno Greyling Rouyanne T Ras Peter L Zock Mario Lorenz Maria T Hopman Dick H J Thijssen Richard Draijer The effect of black tea on blood pressure: a systematic review with meta-analysis of randomized controlled trials.
description	<h4>Objective</h4>Epidemiological evidence has linked consumption of black tea, produced from Camellia sinensis, with a reduced risk of cardiovascular diseases. However, intervention studies on the effects of tea consumption on blood pressure (BP) have reported inconsistent results. Our objective was to conduct a systematic literature review with meta-analysis of controlled human intervention studies examining the effect of tea consumption on BP.<h4>Methods</h4>We systematically searched Medline, Biosis, Chemical Abstracts and EMBASE databases through July 2013. For inclusion, studies had to meet the following pre-defined criteria: 1) placebo controlled design in human adults, 2) minimum of 1 week black tea consumption as the sole intervention, 3) reported effects on systolic BP (SBP) or diastolic BP (DBP) or both. A random effects model was used to calculate the pooled overall effect of black tea on BP.<h4>Results</h4>Eleven studies (12 intervention arms, 378 subjects, dose of 4-5 cups of tea) met our inclusion criteria. The pooled mean effect of regular tea ingestion was -1.8 mmHg (95% CI: -2.8, -0.7; P = 0.0013) for SBP and -1.3 mmHg (95% CI: -1.8, -0.8; P<0.0001) for DBP. In covariate analyses, we found that the method of tea preparation (tea extract powders versus leaf tea), baseline SBP and DBP, and the quality score of the study affected the effect size of the tea intervention (all P<0.05). No evidence of publication bias could be detected.<h4>Conclusions</h4>Our meta-analysis indicates that regular consumption of black tea can reduce BP. Although the effect is small, such effects could be important for cardiovascular health at population level.
format	article
author	Arno Greyling Rouyanne T Ras Peter L Zock Mario Lorenz Maria T Hopman Dick H J Thijssen Richard Draijer
author_facet	Arno Greyling Rouyanne T Ras Peter L Zock Mario Lorenz Maria T Hopman Dick H J Thijssen Richard Draijer
author_sort	Arno Greyling
title	The effect of black tea on blood pressure: a systematic review with meta-analysis of randomized controlled trials.
title_short	The effect of black tea on blood pressure: a systematic review with meta-analysis of randomized controlled trials.
title_full	The effect of black tea on blood pressure: a systematic review with meta-analysis of randomized controlled trials.
title_fullStr	The effect of black tea on blood pressure: a systematic review with meta-analysis of randomized controlled trials.
title_full_unstemmed	The effect of black tea on blood pressure: a systematic review with meta-analysis of randomized controlled trials.
title_sort	effect of black tea on blood pressure: a systematic review with meta-analysis of randomized controlled trials.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/3bd21a46e6a749d798f2a34970a4aaaa
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The effect of black tea on blood pressure: a systematic review with meta-analysis of randomized controlled trials.

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