Tags

Type your tag names separated by a space and hit enter

The efficacy of black tea in ameliorating endothelial function is equivalent to that of green tea.

Abstract

Consumption of tea has been shown to improve endothelial function. It is assumed that catechins are the tea components responsible for these beneficial effects. In black tea, catechin concentrations are significantly lower than in green tea. The present study was designed to compare green and black tea with regard to amelioration of endothelial function. Endothelial function in response to both teas was assessed in bovine aortic endothelial cells (BAEC) and rat aortic rings. To elucidate whether these findings are also applicable to humans, flow-mediated dilation (FMD) and nitro-mediated dilation (NMD) were assessed by ultrasound in twenty-one healthy women before and 2 h after consumption of green and black tea (2 h of FMD and NMD), in comparison with water (control). In BAEC, green and black tea significantly increased endothelial NO synthase activity to the same extent. Similarly, both teas induced comparable endothelial-dependent vasodilation in rat aortic rings. In human subjects, ingestion of green and black tea led to significant increases in FMD: from 5.4 (sd 2.3) to 10.2 (sd 3) % (baseline-adjusted difference (BAD) for 2 h of FMD, green tea v. water: 5.0 (95 % CI 3.0, 7.0) %; P < 0.001) and from 5 (sd 2.6) to 9.1 (sd 3.6) % (BAD for 2 h of FMD, black tea v. water: 4.4 (95 % CI 2.3, 6.5) %; P < 0.001), respectively. The increase in FMD was not significantly different between the two tea preparations (BAD for 2 h of FMD, green tea v. black tea: 0.66 (95 % CI - 0.76, 2.09) %; P = 0.36). NMD did not vary between any of the groups. In conclusion, green and black tea are equally effective in improving endothelial function.

Links

  • Publisher Full Text
  • Authors+Show Affiliations

    ,

    Medizinische Klinik mit Schwerpunkt Kardiologie und Angiologie, Charité - Universitätsmedizin Berlin, Campus Mitte, Schumannstrasse 20-21, D-10117 Berlin, Germany.

    , , , , , ,

    Source

    The British journal of nutrition 99:4 2008 Apr pg 863-8

    MeSH

    Animals
    Aorta
    Brachial Artery
    Catechin
    Cattle
    Cross-Over Studies
    Dose-Response Relationship, Drug
    Drinking
    Endothelial Cells
    Female
    Humans
    In Vitro Techniques
    Linear Models
    Middle Aged
    Nitric Oxide Synthase Type III
    Phytotherapy
    Rats
    Regional Blood Flow
    Tea
    Vasodilation

    Pub Type(s)

    Comparative Study
    Journal Article

    Language

    eng

    PubMed ID

    17916273

    Citation

    Jochmann, Nicoline, et al. "The Efficacy of Black Tea in Ameliorating Endothelial Function Is Equivalent to That of Green Tea." The British Journal of Nutrition, vol. 99, no. 4, 2008, pp. 863-8.
    Jochmann N, Lorenz M, Krosigk Av, et al. The efficacy of black tea in ameliorating endothelial function is equivalent to that of green tea. Br J Nutr. 2008;99(4):863-8.
    Jochmann, N., Lorenz, M., Krosigk, A. v., Martus, P., Böhm, V., Baumann, G., ... Stangl, V. (2008). The efficacy of black tea in ameliorating endothelial function is equivalent to that of green tea. The British Journal of Nutrition, 99(4), pp. 863-8.
    Jochmann N, et al. The Efficacy of Black Tea in Ameliorating Endothelial Function Is Equivalent to That of Green Tea. Br J Nutr. 2008;99(4):863-8. PubMed PMID: 17916273.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - The efficacy of black tea in ameliorating endothelial function is equivalent to that of green tea. AU - Jochmann,Nicoline, AU - Lorenz,Mario, AU - Krosigk,Amélie von, AU - Martus,Peter, AU - Böhm,Volker, AU - Baumann,Gert, AU - Stangl,Karl, AU - Stangl,Verena, Y1 - 2007/10/05/ PY - 2007/10/6/pubmed PY - 2008/5/7/medline PY - 2007/10/6/entrez SP - 863 EP - 8 JF - The British journal of nutrition JO - Br. J. Nutr. VL - 99 IS - 4 N2 - Consumption of tea has been shown to improve endothelial function. It is assumed that catechins are the tea components responsible for these beneficial effects. In black tea, catechin concentrations are significantly lower than in green tea. The present study was designed to compare green and black tea with regard to amelioration of endothelial function. Endothelial function in response to both teas was assessed in bovine aortic endothelial cells (BAEC) and rat aortic rings. To elucidate whether these findings are also applicable to humans, flow-mediated dilation (FMD) and nitro-mediated dilation (NMD) were assessed by ultrasound in twenty-one healthy women before and 2 h after consumption of green and black tea (2 h of FMD and NMD), in comparison with water (control). In BAEC, green and black tea significantly increased endothelial NO synthase activity to the same extent. Similarly, both teas induced comparable endothelial-dependent vasodilation in rat aortic rings. In human subjects, ingestion of green and black tea led to significant increases in FMD: from 5.4 (sd 2.3) to 10.2 (sd 3) % (baseline-adjusted difference (BAD) for 2 h of FMD, green tea v. water: 5.0 (95 % CI 3.0, 7.0) %; P < 0.001) and from 5 (sd 2.6) to 9.1 (sd 3.6) % (BAD for 2 h of FMD, black tea v. water: 4.4 (95 % CI 2.3, 6.5) %; P < 0.001), respectively. The increase in FMD was not significantly different between the two tea preparations (BAD for 2 h of FMD, green tea v. black tea: 0.66 (95 % CI - 0.76, 2.09) %; P = 0.36). NMD did not vary between any of the groups. In conclusion, green and black tea are equally effective in improving endothelial function. SN - 0007-1145 UR - https://www.unboundmedicine.com/medline/citation/17916273/The_efficacy_of_black_tea_in_ameliorating_endothelial_function_is_equivalent_to_that_of_green_tea_ L2 - https://www.cambridge.org/core/product/identifier/S0007114507838992/type/journal_article DB - PRIME DP - Unbound Medicine ER -