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Acute effect of black and green tea on aortic stiffness and wave reflections.
J Am Coll Nutr 2006; 25(3):216-23JA

Abstract

OBJECTIVE

While most studies have shown an inverse relation between tea consumption and cardiovascular risk, other studies have shown opposite results. Aortic stiffness and wave reflections are markers of cardiovascular disease and prognosticators of cardiovascular risk.

METHODS

The acute effect of black and green tea on aortic stiffness and wave reflections was assessed in 29 healthy volunteers in a randomized, single-blind, sham-procedure controlled, cross-over design. In the black tea sub-study, 16 subjects received 6 gm of tea, caffeine (175 mg), or hot water in 3 different sessions. In the green tea sub-study, 13 subjects received 6 gm of tea, caffeine (125 mg), or hot water. Carotid-femoral pulse wave velocity and wave reflection indices were measured at baseline and for 3 hours after consumption.

RESULTS

Black tea increased pulse wave velocity during the first 90 min (increase by 0.49 m/sec, P < 0.05), showing a rapid return towards baseline values thereafter (P = 0.07 for the whole study period); in contrast, green tea had no effect. Both black and green tea increased augmentation index (by 5.0% and by 6.6%, P < 0.01 and P < 0.001, respectively) throughout the study. These changes were less than the respective changes produced by caffeine. Both black and green tea had a significant pressor effect. No change in oxidant status was found with both types of tea.

CONCLUSIONS

Both black and green tea increases acutely wave reflections and only black tea increases aortic stiffness. Tea flavonoids may play a role in the attenuation of the effects of caffeine contained in tea.

Authors+Show Affiliations

Ist Department of Cardiology, Athens Medical School, Hippokration Hospital, Athens, Greece. cvlachop@otenet.grNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

16766780

Citation

Vlachopoulos, Charalambos, et al. "Acute Effect of Black and Green Tea On Aortic Stiffness and Wave Reflections." Journal of the American College of Nutrition, vol. 25, no. 3, 2006, pp. 216-23.
Vlachopoulos C, Alexopoulos N, Dima I, et al. Acute effect of black and green tea on aortic stiffness and wave reflections. J Am Coll Nutr. 2006;25(3):216-23.
Vlachopoulos, C., Alexopoulos, N., Dima, I., Aznaouridis, K., Andreadou, I., & Stefanadis, C. (2006). Acute effect of black and green tea on aortic stiffness and wave reflections. Journal of the American College of Nutrition, 25(3), pp. 216-23.
Vlachopoulos C, et al. Acute Effect of Black and Green Tea On Aortic Stiffness and Wave Reflections. J Am Coll Nutr. 2006;25(3):216-23. PubMed PMID: 16766780.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Acute effect of black and green tea on aortic stiffness and wave reflections. AU - Vlachopoulos,Charalambos, AU - Alexopoulos,Nikolaos, AU - Dima,Ioanna, AU - Aznaouridis,Konstantinos, AU - Andreadou,Ioanna, AU - Stefanadis,Christodoulos, PY - 2006/6/13/pubmed PY - 2006/10/27/medline PY - 2006/6/13/entrez SP - 216 EP - 23 JF - Journal of the American College of Nutrition JO - J Am Coll Nutr VL - 25 IS - 3 N2 - OBJECTIVE: While most studies have shown an inverse relation between tea consumption and cardiovascular risk, other studies have shown opposite results. Aortic stiffness and wave reflections are markers of cardiovascular disease and prognosticators of cardiovascular risk. METHODS: The acute effect of black and green tea on aortic stiffness and wave reflections was assessed in 29 healthy volunteers in a randomized, single-blind, sham-procedure controlled, cross-over design. In the black tea sub-study, 16 subjects received 6 gm of tea, caffeine (175 mg), or hot water in 3 different sessions. In the green tea sub-study, 13 subjects received 6 gm of tea, caffeine (125 mg), or hot water. Carotid-femoral pulse wave velocity and wave reflection indices were measured at baseline and for 3 hours after consumption. RESULTS: Black tea increased pulse wave velocity during the first 90 min (increase by 0.49 m/sec, P < 0.05), showing a rapid return towards baseline values thereafter (P = 0.07 for the whole study period); in contrast, green tea had no effect. Both black and green tea increased augmentation index (by 5.0% and by 6.6%, P < 0.01 and P < 0.001, respectively) throughout the study. These changes were less than the respective changes produced by caffeine. Both black and green tea had a significant pressor effect. No change in oxidant status was found with both types of tea. CONCLUSIONS: Both black and green tea increases acutely wave reflections and only black tea increases aortic stiffness. Tea flavonoids may play a role in the attenuation of the effects of caffeine contained in tea. SN - 0731-5724 UR - https://www.unboundmedicine.com/medline/citation/16766780/Acute_effect_of_black_and_green_tea_on_aortic_stiffness_and_wave_reflections_ L2 - http://www.tandfonline.com/doi/full/10.1080/07315724.2006.10719535 DB - PRIME DP - Unbound Medicine ER -