Tea lowers anxiety, blood pressure

A new study supports earlier evidence that tea can not only reduce blood pressure but also calm anxiety, despite its caffeine content.

Japanese researchers tested two compounds found in tea – L-theanine, the amino acid contained in tea leaves, and caffeine – and their effect in the body when under stress.

They enlisted 14 subjects who underwent three separate trials, in which they took L-theanine and a placebo, caffeine and a placebo, or a placebo only, the Journal of Physiological Anthropology reports.

The subjects were then asked to complete mental activities under varying degrees of stress, such as solving arithmetic questions with their non-dominant hand submerged in a bucket of ice water.

Ai Yoto and her team from the University of Shizuoka found that L-theanine significantly inhibited the blood pressure increases in a high-response group, which consisted of subjects whose blood pressure rose more than average while performing a mental task after taking a placebo.

Caffeine also had an effect on blood pressure but to a lesser degree than L-theanine.

In addition, the L-theanine was shown to reduce tension-anxiety scores on mood tests.


Got a question about this story? Leave it in Comments & Questions below.

This article is tagged with the following keywords. Find out more about MyNBR Tags

Comments & Questions

Commenter icon key: Subscriber Verified

Post New comment or question

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.

NZ Market Snapshot

Forex

Sym Price Change
USD 0.7235 -0.0010 -0.14%
AUD 0.9643 0.0020 0.21%
EUR 0.6501 0.0007 0.11%
GBP 0.5530 -0.0003 -0.05%
HKD 5.6120 -0.0064 -0.11%
JPY 74.8500 0.3300 0.44%

Commods

Commodity Price Change Time
Gold Index 1313.0 -11.760 2016-08-30T00:
Oil Brent 48.7 -0.390 2016-08-30T00:
Oil Nymex 46.3 -0.620 2016-08-30T00:
Silver Index 18.6 -0.097 2016-08-30T00:

Indices

Symbol Open High Last %
NZX 50 7388.9 7398.8 7387.9 0.15%
NASDAQ 5216.4 5219.9 5223.0 -0.19%
DAX 10627.2 10666.8 10657.6 -0.13%
DJI 18436.7 18439.7 18454.3 -0.22%
FTSE 6820.8 6832.9 6820.8 -0.28%
HKSE 23043.1 23063.2 23016.1 -0.17%
NI225 16857.8 16917.9 16725.4 0.97%
ASX 5478.3 5478.3 5478.3 -0.83%