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J Altern Complement Med. 2019 Mar 5. doi: 10.1089/acm.2018.0455. [Epub ahead of print]

Effect of Black Tea and Green Tea on the Radial Pulse Spectrum in Healthy Human.

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1 Graduate Institute of Biomedical Electronics and Bioinformatics, National Taiwan University, Taipei, Taiwan.
2 Department of Geography, National Taiwan University, Taipei, Taiwan.
3 Biophysics Laboratory, Institute of Physics, Academia Sinica, Taipei, Taiwan.
4 Research and Development Department, JinMu Health Technology, Taipei, Taiwan.


The consumption of black tea and green tea has been shown to be beneficial for cardiovascular health. Because the chemical composition of the two teas varies widely, the purpose of the study was to investigate whether the consumption of green tea and black tea had different effects on the arterial system. Thirty-three healthy subjects received a single dose of green tea (dose = 0.05 g/kg) and black tea (dose = 0.05 g/kg) in different weeks. Radial blood pressure and radial pulse pressure were measured before and after drinking tea. The harmonic analysis was performed on radial pressure waves, and harmonics (Cns) were recorded. The results showed that both black tea and green tea consumption significantly increased the C1, C2, C6, C7, C8, C9, and C10 of the radial pressure wave. Furthermore, the results confirmed that the consumption effect of green tea on C6-C10 increase is greater than that of black tea. This report also found a subtle difference that consumption of green tea increased C4, whereas consumption of black tea increased C3. We concluded that black tea and green tea have similar patterns in higher harmonics, but with varying degrees.


black tea; green tea; harmonic analysis; pulse wave spectrum; radial pressure wave


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